125 results on '"Hirofumi Shimada"'
Search Results
2. Implementation of a rapid response system at an isolated radiotherapy facility through simulation training
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Kiyohiro Oshima, Kazumi Tanaka, Tatsuya Ohno, Hidemasa Kawamura, Yasuhiro Komatsu, Masafumi Kanamoto, Masaru Tobe, Chisato Usami, Hiroshi Hinohara, Yoko Kitada, Kazuhisa Tsuda, Tomoaki Ogano, and Hirofumi Shimada
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Medicine (General) ,R5-920 - Published
- 2022
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3. Evaluation of Threshold Dose of Damaged Hepatic Tissue After Carbon-Ion Radiation Therapy Using Gd-EOB-DTPA–Enhanced Magnetic Resonance Imaging
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Masashi Ebara, MD, Kei Shibuya, MD, PhD, Hirofumi Shimada, PhD, Motohiro Kawashima, PhD, Hiromi Hirasawa, MD, PhD, Ayako Taketomi-Takahashi, MD PhD, Tatsuya Ohno, MD, PhD, and Yoshito Tsushima, MD, PhD
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Medical physics. Medical radiology. Nuclear medicine ,R895-920 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Purpose: To evaluate the threshold dose and associated factors using signal-intensity changes in the irradiated area after carbon-ion radiation therapy (C-ion RT) for patients with liver cancer. Methods and Materials: Patients treated for the first time with C-ion RT for malignant liver tumors and followed up with 3-Tesla gadoxetic acid (Gd-EOB-DTPA)–enhanced magnetic resonance imaging (MRI) 3 months after treatment completion were retrospectively enrolled. The volume of focal liver reaction (FLR), a low-intensity area in the hepatobiliary phase of Gd-EOB-DTPA after treatment, was measured. Corrected FLR (cFLR) volume, defined as FLR corrected for changes in tumor volume from before to after treatment, was calculated, and the threshold dose was determined by applying the cFLR volume in the dose-volume histogram. To evaluate potential mismatch in fusion images of planning computed tomography and follow-up MRI, the concordance coefficient (CC) was measured, and patients with a CC < 0.7 were excluded. Sixty patients were included. Multiple regression analysis was performed with the threshold dose as the objective variable and the age, dose, number of fractionations, Child-Pugh score, pretreatment liver volume, and pretreatment tumor volume as explanatory variables. The Student t test or Mann-Whitney U test was used as required. Results: The median threshold doses for each number of dose fractionations (4 fractions, 12 fractions, and overall) were 51.6, 51.9, and 51.8 Gy (relative biological effectiveness [RBE]), respectively, in patients categorized as Child-Pugh class A and 27.0, 28.8, and 27.0 Gy (RBE), respectively, in patients categorized as Child-Pugh class B. In the multiple-regression analysis, only the Child-Pugh score was significant (P < .001). The number of dose fractionations was not statistically significant. Conclusions: Although few patients in the study had decreased liver function, baseline liver function was the only factor significantly associated with the median threshold dose. These findings facilitate appropriate patient selection to receive C-ion RT for malignant hepatic tumors.
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- 2021
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4. Patient-Derived Training Simulator for Image-Guided Adaptive Brachytherapy of Locally Advanced Cervical Cancers: Development and Initial Use
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Kento Tomizawa, Takahiro Oike, Ken Ando, Daisuke Irie, Makoto Sakai, Hirofumi Shimada, and Tatsuya Ohno
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cervical cancer ,image-guided adaptive brachytherapy ,interstitial needles ,training ,3D modeling ,IC/IS applicator ,Medicine - Abstract
Image-guided adaptive brachytherapy (IGABT) using intracavitary and interstitial (IC/IS) techniques plays a pivotal role in definitive radiotherapy for locally advanced cervical cancers. However, the training opportunities for interstitial needle application are limited, preventing this technique from becoming widespread. This study aimed to develop a training simulator for IC/IS brachytherapy. The simulator consists of a soft silicone tumor phantom and acrylic tube mimicking the vagina; it has high visibility because of translucent materials and is compatible with computed tomography (CT) and magnetic resonance imaging (MRI). A patient harboring a typical bulky and irregular-shaped cervical tumor was selected from 495 in-house IGABT-treated candidates, and a tumor phantom (68 × 49 × 45 mm) modeled on this patient was produced from three-dimensional real-scale measurements of the MRI-based high-risk clinical target volume at first brachytherapy. In trial use by two physicians with different levels of IGABT skills, a Fletcher-Suit Asian Pacific applicator, and a Venezia applicator with interstitial needles were nicely applied to the simulator, facilitating successful creation of CT-based treatment plans consistent with clinical practice. Thus, the training simulator can be useful for the training of IC/IS brachytherapy, and warrants further research employing a greater number of phantoms and practitioners to verify its educational value.
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- 2022
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5. Customized mouthpieces designed to reduce tongue mucositis in carbon-ion radiotherapy for tumors of the nasal and paranasal sinuses
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Atsushi Musha, Jun-ichi Saitoh, Katsuyuki Shirai, Yoshiki Kubota, Hirofumi Shimada, Takanori Abe, Yuka Komatsu, Shuichiro Komatsu, Tatsuya Ohno, Takashi Nakano, and Satoshi Yokoo
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Medical physics. Medical radiology. Nuclear medicine ,R895-920 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Mouthpieces are used to fix the positions of the lower jaw and teeth during carbon-ion radiotherapy for head and neck tumors. We used a customized mouthpiece to reduce radiation mucositis by displacing the tongue. Acute radiation mucositis gradually increased for the palate and tongue after approximately six irradiation fractions (maximal mean grade: palate, 2.5 during radiation fractions 15; tongue, 0.8 during radiation fractions 12 and 13). The mean grade of mucositis was significantly lower for the tongue than for the palate from irradiation fraction six until two weeks after irradiation. Keywords: Carbon-ion radiotherapy, Head and neck tumor, Customized mouthpiece
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- 2017
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6. Evaluation of Carbon Ion Radiation-Induced Trismus in Head and Neck Tumors Using Dose-Volume Histograms
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Atsushi Musha, Hirofumi Shimada, Nobuteru Kubo, Hidemasa Kawamura, Naoko Okano, Yuhei Miyasaka, Hiro Sato, Katsuyuki Shirai, Jun-ichi Saitoh, Satoshi Yokoo, Kazuaki Chikamatsu, and Tatsuya Ohno
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carbon ion radiotherapy ,head and neck tumor ,carbon ion radiotherapy-induced trismus ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Carbon ion radiotherapy (C-ion RT) provides a highly localized deposition of energy that can increase radiation doses to tumors while minimizing irradiation of adjacent normal tissues. For tumors located near the temporomandibular joint, C-ion RT-induced trismus may occur. However, the relationship between the carbon ion dose and the onset of trismus is unclear. In this prospective observational study, we assessed the trismus/carbon ion dose relationship using dose−volume histograms in 35 patients who received C-ion RT in their head and neck regions between 2010 and 2014. Trismus was evaluated in patients according to the Common Terminology Criteria for Adverse Events, version 4.0. All patients were treated with 57.6 or 64.0 Gy (relative biological effectiveness (RBE)) in 16 fractions, and the median follow-up time was 57 months. Grade 2 trismus was observed in six patients. The median onset time was 12 months. At maximum radiation doses, all masticatory muscles and coronoid processes, particularly the masseter muscle, were significantly different (p = 0.003). The contouring of the masseter muscle and coronoid process requires different treatment planning. The maximum radiation doses of the coronoid process can be proposed as a guideline for treatment planning, considering the ease of contouring in C-ion RT.
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- 2020
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7. Intraosseous epidermoid cyst of the distal phalanx reconstructed with synthetic bone graft
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Hiromi Sasaki, Satoshi Nagano, Hirofumi Shimada, Takayuki Nakashima, Masahiro Yokouchi, Yasuhiro Ishidou, Takao Setoguchi, and Setsuro Komiya
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Orthopedic surgery ,RD701-811 - Abstract
Intraosseous epidermoid cysts are exceedingly rare. Known as pseudotumors, not true neoplasms, intraosseous epidermoid cysts usually involve the phalanges, the skull, and the toes. Intraosseous epidermoid cysts typically present as destructive osteolytic lesions on X-ray, mimicking malignant bone tumors. Here, we present two cases of an intraosseous epidermoid cyst in the distal phalanx treated with curettage and synthetic bone graft, followed by a review of the relevant literature. In both cases, the patient presented with a painful enlargement of the fingertip following a minor trauma. Magnetic resonance imaging demonstrated lesions involving the distal phalanx that had a low signal on T1-weighted imaging (WI) and a high intensity on T2-WI. In both cases, the lesions were not enhanced by gadolinium. Good remodeling and functional recoveries were obtained. For physically active patients with substantial bone defects, synthetic bone graft may be recommended.
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- 2017
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8. Carbon Ion Radiotherapy at the Gunma University Heavy Ion Medical Center: New Facility Set-up
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Tatsuya Ohno, Kota Torikai, Yukari Yoshida, Takayoshi Ishii, Hiroyuki Katoh, Takashi Nakano, Yoko Kitada, Mutsumi Tashiro, Hirofumi Shimada, Ken Yusa, Satoru Yamada, and Tatsuaki Kanai
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carbon ion radiotherapy ,cancer treatment ,high LET ,facility set-up ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Carbon ion radiotherapy (C-ion RT) offers superior dose conformity in the treatment of deep-seated tumors compared with conventional X-ray therapy. In addition, carbon ion beams have a higher relative biological effectiveness compared with protons or X-ray beams. C-ion RT for the first patient at Gunma University Heavy Ion Medical Center (GHMC) was initiated in March of 2010. The major specifications of the facility were determined based on the experience of clinical treatments at the National Institute of Radiological Sciences (NIRS), with the size and cost being reduced to one-third of those at NIRS. The currently indicated sites of cancer treatment at GHMC are lung, prostate, head and neck, liver, rectum, bone and soft tissue. Between March 2010 and July 2011, a total of 177 patients were treated at GHMC although a total of 100 patients was the design specification during the period in considering the optimal machine performance. In the present article, we introduce the facility set-up of GHMC, including the facility design, treatment planning systems, and clinical preparations.
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- 2011
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9. Prediction of Acute Radiation Mucositis using an Oral Mucosal Dose Surface Model in Carbon Ion Radiotherapy for Head and Neck Tumors.
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Atsushi Musha, Hirofumi Shimada, Katsuyuki Shirai, Jun-Ichi Saitoh, Satoshi Yokoo, Kazuaki Chikamatsu, Tatsuya Ohno, and Takashi Nakano
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Medicine ,Science - Abstract
To evaluate the dose-response relationship for development of acute radiation mucositis (ARM) using an oral mucosal dose surface model (OMDS-model) in carbon ion radiotherapy (C-ion RT) for head and neck tumors.Thirty-nine patients receiving C-ion RT for head and neck cancer were evaluated for ARM (once per week for 6 weeks) according to the Common Terminology Criteria for Adverse Events (CTCAE), version 4.0, and the Radiation Therapy Oncology Group (RTOG) scoring systems. The irradiation schedule typically used was 64 Gy [relative biological effectiveness (RBE)] in 16 fractions for 4 weeks. Maximum point doses in the palate and tongue were compared with ARM in each patient.The location of the ARM coincided with the high-dose area in the OMDS-model. There was a clear dose-response relationship between maximum point dose and ARM grade assessed using the RTOG criteria but not the CTCAE. The threshold doses for grade 2-3 ARM in the palate and tongue were 43.0 Gy(RBE) and 54.3 Gy(RBE), respectively.The OMDS-model was useful for predicting the location and severity of ARM. Maximum point doses in the model correlated well with grade 2-3 ARM.
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- 2015
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10. Early complete remission of osteoid osteoma with conservative medical management
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Masahiro Yokouchi, Satoshi Nagano, Hirofumi Shimada, Shunsuke Nakamura, Takao Setoguchi, Ichiro Kawamura, Yasuhiro Ishidou, and Setsuro Komiya
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osteoid osteoma, conservative therapy, NSAIDs, radiological resolution ,Medicine ,Pediatrics ,RJ1-570 - Abstract
Osteoid osteoma is a benign bone tumor and causes persistent pain that is usually treated by surgery or ablation therapy. Conservative management with non-steroidal anti-inflammatory drugs (NSAIDs) is also used to avoid the morbidity associated with surgery or ablation therapy; however, it usually takes several years for the condition to resolve using conservative treatment. Our patient, a 10-year-old boy, presented with a 3-month history of a painful lesion in his leg. Plain radiography, bone scanning, computed tomography and magnetic resonance images showed the presence of a lesion with radiological features consistent with an osteoid osteoma of the cortex in the tibial diaphysis. The patient was treated with a usual dose of ibuprofen for 3 weeks. Within 3 weeks, his symptoms were almost completely resolved; he no longer needed NSAIDs and returned to normal life. Repeat imaging studies showed complete disappearance of the nidus within 2.5 years after the resolution of symptoms.
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- 2014
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11. Analysis of Surgical Site Infection after Musculoskeletal Tumor Surgery: Risk Assessment Using a New Scoring System
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Satoshi Nagano, Masahiro Yokouchi, Takao Setoguchi, Hiromi Sasaki, Hirofumi Shimada, Ichiro Kawamura, Yasuhiro Ishidou, Junichi Kamizono, Takuya Yamamoto, Hideki Kawamura, and Setsuro Komiya
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Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,RC254-282 - Abstract
Surgical site infection (SSI) has not been extensively studied in musculoskeletal tumors (MST) owing to the rarity of the disease. We analyzed incidence and risk factors of SSI in MST. SSI incidence was evaluated in consecutive 457 MST cases (benign, 310 cases and malignant, 147 cases) treated at our institution. A detailed analysis of the clinical background of the patients, pre- and postoperative hematological data, and other factors that might be associated with SSI incidence was performed for malignant MST cases. SSI occurred in 0.32% and 12.2% of benign and malignant MST cases, respectively. The duration of the surgery (P=0.0002) and intraoperative blood loss (P=0.0005) was significantly more in the SSI group than in the non-SSI group. We established the musculoskeletal oncological surgery invasiveness (MOSI) index by combining 4 risk factors (blood loss, operation duration, preoperative chemotherapy, and the use of artificial materials). The MOSI index (0–4 points) score significantly correlated with the risk of SSI, as demonstrated by an SSI incidence of 38.5% in the group with a high score (3-4 points). The MOSI index score and laboratory data at 1 week after surgery could facilitate risk evaluation and prompt diagnosis of SSI.
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- 2014
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12. Paget Disease of Bone in Japanese Patients: A Report of Three Cases
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Satoshi Nagano, Masahiro Yokouchi, Ryusaku Nagayoshi, Hiromi Sasaki, Hirofumi Shimada, Takao Setoguchi, Kosei Ijiri, and Setsuro Komiya
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Orthopedic surgery ,RD701-811 - Abstract
Paget disease of bone (PDB) is a bone metabolic disorder causing pain, fractures, and deformity. Its incidence is estimated to be 1 to 2% in Caucasians older than 55 years, but in Asian populations the incidence is rare. We report on 2 female and one male Japanese patients aged 46 to 73 years with PDB. One patient had monostotic disease with pain around the shoulder and the other 2 were asymptomatic. All patients had elevated alkaline phosphatase (ALP) levels (range, 629–957 U/L). Two patients responded to oral bisphosphonate treatment and achieved normalised ALP levels and pain relief. One patient with polyostotic disease did not show any change in ALP levels. The diagnosis of the disease and the indications for bisphosphonate treatment are discussed.
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- 2013
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13. Usefulness of Combined Kampo and Modern Medicine as Therapy for Pediatric Patients Refractory to Standard Modern Medicine
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Yuki WATANABE, Takao NAMIKI, Michimi NAKAMURA, Kouichi RYU, Hirofumi SHIMADA, Masahiko NEZU, Yuuko IZUMI, Akio YAGI, Yoshiro HIRASAKI, and Naoki SHIMOJO
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General Earth and Planetary Sciences ,General Environmental Science - Published
- 2022
14. Rectovaginal fistula in a cervical cancer patient treated with sequential radiotherapy and bevacizumab: A dose‐volume analysis
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Hirofumi Shimada, Kazutoshi Murata, Ken Ando, Takuya Kaminuma, Kento Tomizawa, Takahiro Oike, and Tatsuya Ohno
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medicine.medical_specialty ,Medicine (General) ,Bevacizumab ,Side effect ,medicine.drug_class ,cervical cancer ,medicine.medical_treatment ,Urology ,Rectum ,Case Report ,Case Reports ,030204 cardiovascular system & hematology ,bevacizumab ,Monoclonal antibody ,dose‐volume analysis ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,R5-920 ,medicine ,Cervical cancer ,business.industry ,rectovaginal fistula ,General Medicine ,medicine.disease ,Vascular endothelial growth factor ,Radiation therapy ,radiation ,medicine.anatomical_structure ,chemistry ,Rectovaginal fistula ,030220 oncology & carcinogenesis ,Medicine ,business ,medicine.drug - Abstract
Bevacizumab is a monoclonal antibody against vascular endothelial growth factor that exerts antitumor effect by preventing tumor angiogenesis. Gastrointestinal fistula is a common side effect of bevacizumab in combination with radiotherapy. This case of rectovaginal fistula indicates that the side effect may be unpredictable by the conventional dose‐volume parameters for the rectum.
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- 2021
15. Development and Feasibility of a Patient-Derived Training Simulator for Image-Guided Adaptive Brachytherapy of Locally Advanced Cervical Cancers
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Kento Tomizawa, Takahiro Oike, Ken Ando, Daisuke Irie, Makoto Sakai, Hirofumi Shimada, and Tatsuya Ohno
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Background Image-guided adaptive brachytherapy (IGABT) plays a pivotal role in definitive radiotherapy of cervical cancer. Although the combination of a tandem and ovoid applicator with interstitial needles (IC/IS brachytherapy) is an efficient IGABT technique for bulky irregular-shaped tumors, training opportunities for IC/IS brachytherapy remain limited. Thus, we developed a training simulator for IC/IS brachytherapy for locally advanced cervical cancer and tested its feasibility. Methods The training simulator combined a patient-derived soft silicone tumor phantom with an acrylic tube mimicking the vagina. The tumor phantom was modeled on a cervical cancer patient treated with IGABT at our institute between 2012–2020, through detailed inspection of their three-dimensional (3D) high-risk clinical target volume (HR-CTV) at the first brachytherapy session. A true-scale tumor phantom was created from the HR-CTV data using 3D-printing. The feasibility of the training simulator was investigated by comparing treatment plans between the following six sessions (sessions #1–#3, with a Fletcher-Suit Asian Pacific applicator; #4–#6, with a Venezia applicator): in sessions #1 and #4, an expert inserted a tandem and ovoids (T&O); in sessions #2 and #5, a resident inserted a T&O plus four needles; and in sessions #3 and #6, an expert inserted a T&O plus four needles. At each session, the highest possible dose was prescribed to the HR-CTV while keeping the D2cc of the rectum and bladder (derived from the model case) below 6 and 7.6 Gy, respectively. Results The training simulator was developed using the HR-CTV data of a FIGO stage IIIB tumor (68 ⋅ 49 ⋅ 45 mm) selected from one of 495 candidates. The feasibility tests with a Fletcher-Suit Asian Pacific applicator resulted in HR-CTV D90 of 4.23, 5.69, and 6.70 Gy for sessions #1, #2, and #3, respectively. With a Venezia applicator, HR-CTV D90 was 4.16, 6.20, and 6.45 Gy for sessions #4, #5, and #6, respectively. Conclusions The tumor phantom was a good representation that resulted in various HR-CTV D90 doses depending on the physician’s experience and applicator type. Further evaluation of the training simulator is warranted to confirm its educational value for IC/IS brachytherapy for locally advanced cervical cancer.
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- 2021
16. Early Enhancement with Contrast-Enhanced Ultrasonography Relates to the Number of Small-Diameter Neovessels in the Carotid Plaque
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Sho Takeshita, Toshiyasu Ogata, Noriko Uesugi, Kazuki Nabeshima, Hirofumi Shimada, Hisatomi Arima, Tooru Inoue, and Yoshio Tsuboi
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Neurology ,Neurology (clinical) ,Cardiology and Cardiovascular Medicine - Abstract
Background and Purpose: Intraplaque neovessels (INVs) have been recognized as a major cause of intraplaque hemorrhage and subsequent vulnerability of the carotid plaque. However, the exact mechanisms by which INVs cause intraplaque hemorrhage remain unclear. Various sizes of INVs coexist in carotid plaques pathologically, and we hypothesized that the size of INVs would be associated with carotid plaque histology, particularly in terms of intraplaque hemorrhage. Detection method of INV is important when determining whether carotid plaques are vulnerable, and contrast-enhanced ultrasonography (CEUS) is one of the most useful methods to detect them. The purpose of this study was to examine the relationship between findings from CEUS and vascular pathology obtained by carotid endarterectomy (CEA). We focused on associations between small and large INVs evaluated by CEUS and histologically defined intraplaque hemorrhage. Methods: Participants comprised 115 patients (mean age, 73.0 ± 7.2 years; 96 men) who underwent preoperative CEUS and underwent CEA. CEUS findings were evaluated as vascular grade at 0 min (Vas-G0) and 10 min (Vas-G10) after contrast injection. Plaques were histologically evaluated quantitatively for the total area of intraplaque hemorrhage, cholesterol, and calcification and the thinnest fibrous cap. Immunohistochemical studies were conducted using anti-CD-34 antibody as a marker for endothelial cells. INVs were divided into two groups depending on diameter: small INVs, Results: Multivariable analyses indicated that CEUS Vas-G0 was associated with the 4th quartile of the number of small INVs compared with other quartiles, and Vas-G10 was associated with the 4th quartile of the number of large INVs. Histologically, the presence and area of intraplaque hemorrhage were associated with the number of small INVs, while the increased number of large INVs was associated with infrequent plaque disruption and thicker fibrous cap. Conclusions: Our study showed that early phase enhancement in the CEUS can help identify plaque vulnerability by predicting a larger number of small INVs. This information can also help determine treatment strategies for carotid plaque.
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- 2021
17. Clinical features and dosimetric evaluation of carbon ion radiation-induced osteoradionecrosis of mandible in head and neck tumors
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Katsuyuki Shirai, Hirofumi Shimada, Atsushi Musha, Takuya Kaminuma, Hidemasa Kawamura, Nobuteru Kubo, Naoko Okano, Kazuaki Chikamatsu, Tatsuya Ohno, Mai Anakura, Jun-ichi Saitoh, Akiko Adachi, Hiro Sato, Kohei Okada, and Satoshi Yokoo
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Osteoradionecrosis ,Radiation induced ,Heavy Ion Radiotherapy ,Mandible ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Relative biological effectiveness ,Dosimetry ,Humans ,Radiology, Nuclear Medicine and imaging ,Retrospective Studies ,medicine.diagnostic_test ,business.industry ,Head and neck tumors ,Magnetic resonance imaging ,Retrospective cohort study ,Radiotherapy Dosage ,Hematology ,medicine.disease ,Carbon ,Oncology ,Head and Neck Neoplasms ,030220 oncology & carcinogenesis ,Quality of Life ,Nuclear medicine ,business - Abstract
Background and purpose Osteoradionecrosis (ORN) affects the patient’s quality of life by making eating and maintaining oral hygiene painful. This study aimed to analyze carbon ion radiotherapy (C-ion RT)-induced ORN of the mandible. Materials and methods A retrospective study of 199 patients with head and neck tumors treated with C-ion RT was performed from 2010 to 2019. Only 11 patients with tumors located in the oropharynx and floor of the mouth were analyzed. C-ion RT consisted of 57.6 Gy or 64.0 Gy (relative biological effectiveness) in 16 fractions. The mandible was analyzed for magnetic resonance imaging (MRI) changes and bone exposure. The relationship between the radiation dose and ORN of the mandible was analyzed. Results Five patients (45.5%) had ORN of the mandible. The median follow-up time was 68 months. The median onset times based on MRI changes and bone exposure were 9 and 15 months, respectively. Doses of 30 Gy (relative biological effectiveness) to the mandible and teeth showed the most significant effect, causing ORN at 29.5 ± 6.7 cc and 3.9 ± 1.8 cc, respectively, with cut-off values at 16.5 cc (p = 0.002) and 1.8 cc (p = 0.0059), respectively. Conclusion This is the first study reporting the incidence, onset time, and risk-predictive dosimetry parameters of C-ion RT-induced ORN of the mandible. Our study will be useful for establishing clinical strategies for C-ion RT to the head and neck near the mandible.
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- 2021
18. Association of carotid ultrasonography with perioperative stroke after thoracic aortic aneurysm treatment: a retrospective study
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Yoshio Tsuboi, Hiromitsu Teratani, Hirofumi Shimada, Tooru Inoue, Hideichi Wada, Toshiyasu Ogata, and Michiko Ito
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Male ,medicine.medical_specialty ,Cervical Artery ,medicine.medical_treatment ,Aorta, Thoracic ,Thoracic aortic aneurysm ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,Blood Vessel Prosthesis Implantation ,0302 clinical medicine ,medicine.artery ,Internal medicine ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,cardiovascular diseases ,Common carotid artery ,Embolization ,Stroke ,Aged ,Retrospective Studies ,Ultrasonography ,Aged, 80 and over ,Aortic Aneurysm, Thoracic ,business.industry ,Endovascular Procedures ,Carotid ultrasonography ,Retrospective cohort study ,General Medicine ,Middle Aged ,medicine.disease ,Blood Vessel Prosthesis ,Treatment Outcome ,Bypass surgery ,Cardiology ,030211 gastroenterology & hepatology ,Female ,Stents ,business - Abstract
The purpose of this study was to verify whether carotid ultrasonography (CUS) findings could be associated with the occurrence of perioperative stroke after thoracic aortic aneurysm (TAA) treatment. Patients with TAAs who were treated by either total arch replacement or thoracic endovascular aortic repair (TEVAR) were retrospectively enrolled. Left subclavian artery (LSA) embolization and bypass surgery of the left common carotid artery (CCA) to the LSA before TEVAR were additionally performed for some patients. CUS was performed before TAA treatment to evaluate carotid atherosclerosis and flow velocities of bilateral cervical arteries. After dividing patients into those with and without perioperative stroke, their background, atherosclerotic risk factors, history of stroke, TAA location and size, treatment procedures, and CUS parameters were compared between the two groups. Of the 60 patients (18 women, 42 men; mean age 73.5 ± 10.2 years) with TAA, four (7.5%) developed perioperative stroke. There were no significant differences in the patients’ characteristics and their TAAs between those with and without perioperative stroke. For the CUS parameters, end-diastolic velocity (EDV) of bilateral CCAs was significantly decreased in perioperative stroke patients (with vs without stroke; right: 9.2 ± 1.8 vs. 14.5 ± 4.6 cm/s, P = 0.025, left: 9.1 ± 0.3 vs. 15.0 ± 4.5 cm/s, P = 0.012), whereas the resistance index (RI) of bilateral CCAs was significantly elevated (right: 0.76 vs. 0.87, P = 0.008, left: 0.76 vs. 0.87, P
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- 2021
19. Evaluation of Carbon Ion Radiation-Induced Trismus in Head and Neck Tumors Using Dose-Volume Histograms
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Yuhei Miyasaka, Tatsuya Ohno, Hiro Sato, Nobuteru Kubo, Katsuyuki Shirai, Hirofumi Shimada, Jun-ichi Saitoh, Atsushi Musha, Hidemasa Kawamura, Kazuaki Chikamatsu, Naoko Okano, and Satoshi Yokoo
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Cancer Research ,Trismus ,lcsh:RC254-282 ,Article ,Masseter muscle ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Relative biological effectiveness ,Radiation treatment planning ,head and neck tumor ,business.industry ,carbon ion radiotherapy ,carbon ion radiotherapy-induced trismus ,Common Terminology Criteria for Adverse Events ,030206 dentistry ,lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,Temporomandibular joint ,Masticatory force ,medicine.anatomical_structure ,Oncology ,030220 oncology & carcinogenesis ,Carbon Ion Radiotherapy ,medicine.symptom ,Nuclear medicine ,business - Abstract
Carbon ion radiotherapy (C-ion RT) provides a highly localized deposition of energy that can increase radiation doses to tumors while minimizing irradiation of adjacent normal tissues. For tumors located near the temporomandibular joint, C-ion RT-induced trismus may occur. However, the relationship between the carbon ion dose and the onset of trismus is unclear. In this prospective observational study, we assessed the trismus/carbon ion dose relationship using dose&minus, volume histograms in 35 patients who received C-ion RT in their head and neck regions between 2010 and 2014. Trismus was evaluated in patients according to the Common Terminology Criteria for Adverse Events, version 4.0. All patients were treated with 57.6 or 64.0 Gy (relative biological effectiveness (RBE)) in 16 fractions, and the median follow-up time was 57 months. Grade 2 trismus was observed in six patients. The median onset time was 12 months. At maximum radiation doses, all masticatory muscles and coronoid processes, particularly the masseter muscle, were significantly different (p = 0.003). The contouring of the masseter muscle and coronoid process requires different treatment planning. The maximum radiation doses of the coronoid process can be proposed as a guideline for treatment planning, considering the ease of contouring in C-ion RT.
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- 2020
20. Single‐cell genotyping of phytoplankton from ocean water by gel‐based cell manipulation
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Tomoko Yoshino, Yihao Mao, Yoshiaki Maeda, Ryo Negishi, Satoshi Murata, Seiichiro Moriya, Hirofumi Shimada, Atsushi Arakaki, Kenichi Kobayashi, Yoshitsugu Hagiwara, Kazutoshi Okamoto, and Tsuyoshi Tanaka
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Genotype ,Oceans and Seas ,Phytoplankton ,Water ,Molecular Medicine ,General Medicine ,Plankton ,Applied Microbiology and Biotechnology ,Phylogeny - Abstract
A comprehensive understanding of phytoplankton diversity is valuable for assessing an environment of interest as phytoplankton are primary producers in various aquatic food webs. Microscopic analyses are useful for diversity assessment based on characteristic cell morphologies. However, phylogenetic classification based solely on morphology requires an extremely high level of expertise. The genetic approach is another option for evaluating phytoplankton diversity; however, it cannot reveal morphological information. To integrate these two approaches, an original technology was developed, that is referred to as microcavity array (MCA)/gel-based cell manipulation (GCM). The model experiments using monocultures of various phytoplankton indicated that the efficiencies of cell recovery and isolation of single-cell plankton were dependent on cell size and shape. Cells with widths larger than the cavity width showed high level of recovery and isolation efficiency. Subsequent whole-genome amplification (WGA) of isolated single-cell plankton provided a sufficient amount (≈30 μg) of WGA products for genetic analyses. Furthermore, it is showed that MCA/GCM could directly analyze phytoplankton in ocean water obtained from Suruga Bay, Japan, without any cumbersome pretreatment. These results indicate that MCA/GCM technology is a powerful tool for elucidating the phytoplankton diversity in marine environment.
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- 2022
21. Implementation of a rapid response system at an isolated radiotherapy facility through simulation training
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Hidemasa Kawamura, Yasuhiro Komatsu, Kazumi Tanaka, Masafumi Kanamoto, Masaru Tobe, Chisato Usami, Hiroshi Hinohara, Kiyohiro Oshima, Yoko Kitada, Kazuhisa Tsuda, Tomoaki Ogano, Hirofumi Shimada, and Tatsuya Ohno
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Medicine (General) ,Quality Improvement Report ,Leadership and Management ,Health Policy ,Public Health, Environmental and Occupational Health ,simulation ,humanities ,quality improvement ,Transportation of Patients ,R5-920 ,patient safety ,Humans ,Simulation Training ,medical emergency team - Abstract
A rapid response system is required in a radiotherapy department for patients experiencing a critical event when access to an emergency department is poor due to geographic location and the patient is immobilised with a fixation device. We, therefore, rebuilt the response system and tested it through onsite simulations. A multidisciplinary core group was created and onsite simulations were conducted using a Plan-Do-Study-Act cycle. We identified the important characteristics of our facility, including its distance from the emergency department; the presence of many staff with little direct contact with patients; the treatment room environment and patient fixation with radiotherapy equipment. We also examined processes in each phase of the emergency response: detecting an emergency, calling the medical emergency team (MET), MET transportation to the site and on-site response and patient transportation to the emergency department. The protocol was modified, and equipment was updated. On-site simulations were held with and without explanation of the protocol and training scenario in advance. The time for the MET to arrive at the site during a 2017 simulation prior to the present project was 7 min, whereas the time to arrive after the first simulation session was shortened to 5 min and was then shortened further to 4 min in the second session, despite no prior explanation of the situation. A multidisciplinary project for emergency response with on-site simulations was conducted at an isolated radiation facility. A carefully planned emergency response is important not only in heavy ion therapy facilities but also in other departments and facilities that do not have easy access to hospital emergency departments.
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- 2022
22. Quantification of Carotid Plaque Histology Using iPlaque Software
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Mika Fujiwara, Masataka Sata, Toshiyasu Ogata, Tooru Inoue, Yoshio Tsuboi, Noriko Uesugi, Sho Takeshita, Hirotsugu Yamada, and Hirofumi Shimada
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Male ,Acoustics and Ultrasonics ,medicine.medical_treatment ,Biophysics ,Carotid endarterectomy ,Endarterectomy ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,Image Processing, Computer-Assisted ,Medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Carotid Stenosis ,Integrated backscatter ,Aged ,Ultrasonography ,Aged, 80 and over ,Radiological and Ultrasound Technology ,business.industry ,Histology ,Middle Aged ,Software package ,Female ,Nuclear medicine ,business ,Tissue composition ,030217 neurology & neurosurgery ,Software - Abstract
The iPlaque software package can use integrated backscatter (IB) values of carotid plaque to extract information on tissue composition. The aim of this study was to evaluate the association between the plaque histologic classification and IB values evaluated by iPlaque. In 49 patients undergoing carotid endarterectomy, IB values of whole carotid plaque were measured using iPlaque from the long-axis ultrasonographic image. Histologic findings of resected plaques were defined using the classification of the American Heart Association. The average IB values were statistically compared with the classification. Plaque samples from 49 patients were categorized into V, VI and VII, (13, 32 and 4 cases, respectively). Both the average and standard deviation of the IB values in each plaque sample significantly differed among the three classifications (p = 0.001). The IB of carotid plaque obtained by iPlaque analysis was associated with its histologic characteristics.
- Published
- 2020
23. Detection and Differentiation of Dural Arteriovenous Fistulas in the Transverse Sinus/Sigmoid Sinus and Cavernous Sinus Using Carotid Ultrasound: Importance of Evaluation of the Occipital Artery
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Toshio Higashi, Tooru Inoue, Toshiyasu Ogata, Kenji Fukuda, Emiko Hisaeda, and Hirofumi Shimada
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Male ,medicine.medical_specialty ,External carotid artery ,Arteriovenous fistula ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Dural arteriovenous fistulas ,medicine.artery ,Medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Occipital artery ,Aged ,Retrospective Studies ,Sigmoid sinus ,Central Nervous System Vascular Malformations ,030219 obstetrics & reproductive medicine ,Radiological and Ultrasound Technology ,medicine.diagnostic_test ,business.industry ,Ultrasound ,Middle Aged ,medicine.disease ,Embolization, Therapeutic ,Cerebral Angiography ,Carotid Arteries ,Cavernous sinus ,Cavernous Sinus ,Female ,Radiology ,business ,Cerebral angiography - Abstract
OBJECTIVES Dural arteriovenous fistula (DAVFs) in the transverse sinus (TS)/sigmoid sinus (SS) and cavernous sinus (CS) are observed frequently in the clinic. This study aimed to detect DAVFs with ultrasound and compare carotid ultrasound findings between these conditions. METHODS We retrospectively reviewed 26 patients with either a TS/SS DAVF or a CS DAVF who were admitted to our hospital for evaluation of DAVFs from 2014 to 2018. The shunt site decision was made by neuroendovascular experts, whereas carotid ultrasound examinations were performed by ultrasound specialists. The flow velocity of the ipsilateral external carotid artery was reviewed in all 26 patients, whereas that of the occipital artery (OA) was examined in 20 patients. Blood flow velocities were compared between the TS/SS DAVF and CS DAVF groups. RESULTS The study included 18 patients with a TS/SS DAVF (11 women and 7 men; mean age ± SD, 65.3 ± 18.6 years) and 8 patients with a CS DAVF (7 women and 1 man; mean age, 70.4 ± 9.3 years). Evaluations of feeder arteries on cerebral angiography showed that all patients had dural branches from the internal carotid and middle meningeal arteries as feeders of CS DAVFs, whereas the OA was the major feeder source of all TS/SS DAVF cases. The end-diastolic velocity (EDV) of the external carotid artery was significantly higher in patients with a TS/SS DAVF compared with those with a CS DAVF (P = .004). The EDV of the OA was significantly elevated in TS/SS DAVF cases compared with CS DAVF cases (P
- Published
- 2020
24. Evaluation of the Time-Dependent Changes and the Vulnerability of Carotid Plaques Using Contrast-Enhanced Carotid Ultrasonography
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Toshiyasu Ogata, Koichi Takano, Akira Matsunaga, Toshio Higashi, Hirofumi Shimada, Hiroshi Abe, Tooru Inoue, and Takaaki Yamashita
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Male ,Carotid ultrasound ,Time Factors ,Contrast enhancement ,media_common.quotation_subject ,education ,Contrast Media ,030204 cardiovascular system & hematology ,03 medical and health sciences ,Reference image ,0302 clinical medicine ,Predictive Value of Tests ,medicine ,Humans ,Contrast (vision) ,Carotid Stenosis ,Prospective Studies ,Aged ,Ultrasonography ,media_common ,Rupture, Spontaneous ,medicine.diagnostic_test ,business.industry ,Rehabilitation ,Carotid ultrasonography ,Reproducibility of Results ,Magnetic resonance imaging ,Plaque, Atherosclerotic ,Carotid Arteries ,Disease Progression ,Female ,Surgery ,Neurology (clinical) ,Cardiology and Cardiovascular Medicine ,business ,Nuclear medicine ,030217 neurology & neurosurgery - Abstract
Background The association of carotid plaque enhancement on contrast-enhanced carotid ultrasound (CEUS) and plaque vulnerability evaluated by magnetic resonance imaging (MRI) was to be determined. Materials and methods The 103 patients underwent CEUS from May 2013 until June 2016. CEUS images of the carotid plaque were obtained offline. Plaque images obtained at 1, 3, 5, and 10 minutes were compared with the reference image, defined as the image obtained at 0 minute. Plaque brightness was assessed using the gray-scale median during contrast enhancement (GSM-C). Plaque vulnerability was evaluated using T1- and T2-weighted MRI and Volume ISotropic TSE Acquisition (VISTA), with a VISTA cutoff value for the plaque muscle ratio (PMR) of 1.5. Time-dependent changes in the GSM-C were evaluated, and those between 0 and 1 minute were compared with the PMR values determined on MRI. Findings GSM-C decreased significantly over time, from 32.0 at 0 minute to 28.0 at 1 minute, 25.0 at 3 minutes, and 19.0 at 10 minutes. The greater the increase in the changes in the GSM-C from 0 to 1 minute, the more significant the association with a PMR higher than the median on T1 (GSM-C: 0 minute: 29.0, 1 minute: 24.0, P = .015), a PMR less than or equal to the median on T2 (0 min: 35.0, 1 min: 28.0, P = .003), and a PMR more than 1.5 determined on VISTA (GSM-C: 0 minute: 29.0, 1 minute: 24.0, P = .005). Conclusions Early changes in the GSM-C evaluated with CEUS indicate significant plaque vulnerability on MRI.
- Published
- 2018
25. Co-precipitation molecules hemopexin and transferrin may be key molecules for fibrillogenesis in TTR V30M amyloidogenesis
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Hajime Tei, Yutaka Takaoka, Aki Sugano, Yoshiyuki Sakaki, Naoya Hatano, Ken Ichi Yamamura, Hirofumi Shimada, Hitoshi Niwa, Toshiyuki Sakaeda, Mika Ohta, and Hirotaka Sato
- Subjects
0301 basic medicine ,endocrine system ,Amyloid ,Mutant ,Proteomic analysis ,Mice, Transgenic ,03 medical and health sciences ,TTR amyloidogenesis ,In vivo ,Hemopexin ,mental disorders ,Intestine, Small ,Molecular dynamics simulation ,Genetics ,Animals ,Humans ,Prealbumin ,Computer Simulation ,chemistry.chemical_classification ,Amyloid Neuropathies, Familial ,biology ,Transferrin ,nutritional and metabolic diseases ,Fibrillogenesis ,Blood Proteins ,Molecular medicine ,Molecular biology ,Transthyretin ,Disease Models, Animal ,030104 developmental biology ,chemistry ,biology.protein ,Animal Science and Zoology ,Original Article ,Electrophoresis, Polyacrylamide Gel ,Agronomy and Crop Science ,Biotechnology - Abstract
The disease model of familial amyloidotic polyneuropathy-7.2-hMet30 mice-manifests amyloid deposition that consists of a human amyloidogenic mutant transthyretin (TTR) (TTR V30M). Our previous study found amyloid deposits in 14 of 27 7.2-hMet30 mice at 21-24 months of age. In addition, non-fibrillar TTR deposits were found in amyloid-negative 7.2hMet30 mice. These results suggested that TTR amyloidogenesis required not only mutant TTR but also an additional factor (or factors) as an etiologic molecule. To determine the differences in serum proteome in amyloid-positive and amyloid-negative mice in the 7.2-hMet30 model, we used proteomic analyses and studied serum samples obtained from these mice. Hemopexin (HPX) and transferrin (Tf) were detected in the serum samples from amyloid-positive mice and were also found in amyloid deposits via immunohistochemistry, but serum samples from amyloid-negative mice did not contain HPX and Tf. These two proteins were also not detected in non-fibrillar TTR deposits. In addition, in silico analyses suggested that HPX and Tf facilitate destabilization of TTR secondary structures and misfolding of TTR. These results suggest that HPX and Tf may be associated with TTR amyloidogenesis after fibrillogenesis in vivo.
- Published
- 2018
26. Evaluation of Threshold Dose of Damaged Hepatic Tissue After Carbon-Ion Radiation Therapy Using Gd-EOB-DTPA–Enhanced Magnetic Resonance Imaging
- Author
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Tatsuya Ohno, Ayako Taketomi-Takahashi, Motohiro Kawashima, Yoshito Tsushima, Hirofumi Shimada, Masashi Ebara, Kei Shibuya, and Hiromi Hirasawa
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Gadoxetic acid ,medicine.diagnostic_test ,business.industry ,medicine.medical_treatment ,R895-920 ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,Magnetic resonance imaging ,medicine.disease ,Radiation therapy ,Medical physics. Medical radiology. Nuclear medicine ,Threshold dose ,Oncology ,medicine ,Relative biological effectiveness ,Scientific Article ,Radiology, Nuclear Medicine and imaging ,Liver function ,Liver cancer ,business ,Nuclear medicine ,RC254-282 ,medicine.drug ,Decreased liver function - Abstract
Purpose: To evaluate the threshold dose and associated factors using signal-intensity changes in the irradiated area after carbon-ion radiation therapy (C-ion RT) for patients with liver cancer. Methods and Materials: Patients treated for the first time with C-ion RT for malignant liver tumors and followed up with 3-Tesla gadoxetic acid (Gd-EOB-DTPA)–enhanced magnetic resonance imaging (MRI) 3 months after treatment completion were retrospectively enrolled. The volume of focal liver reaction (FLR), a low-intensity area in the hepatobiliary phase of Gd-EOB-DTPA after treatment, was measured. Corrected FLR (cFLR) volume, defined as FLR corrected for changes in tumor volume from before to after treatment, was calculated, and the threshold dose was determined by applying the cFLR volume in the dose-volume histogram. To evaluate potential mismatch in fusion images of planning computed tomography and follow-up MRI, the concordance coefficient (CC) was measured, and patients with a CC < 0.7 were excluded. Sixty patients were included. Multiple regression analysis was performed with the threshold dose as the objective variable and the age, dose, number of fractionations, Child-Pugh score, pretreatment liver volume, and pretreatment tumor volume as explanatory variables. The Student t test or Mann-Whitney U test was used as required. Results: The median threshold doses for each number of dose fractionations (4 fractions, 12 fractions, and overall) were 51.6, 51.9, and 51.8 Gy (relative biological effectiveness [RBE]), respectively, in patients categorized as Child-Pugh class A and 27.0, 28.8, and 27.0 Gy (RBE), respectively, in patients categorized as Child-Pugh class B. In the multiple-regression analysis, only the Child-Pugh score was significant (P < .001). The number of dose fractionations was not statistically significant. Conclusions: Although few patients in the study had decreased liver function, baseline liver function was the only factor significantly associated with the median threshold dose. These findings facilitate appropriate patient selection to receive C-ion RT for malignant hepatic tumors.
- Published
- 2021
27. Customized mouthpieces designed to reduce tongue mucositis in carbon-ion radiotherapy for tumors of the nasal and paranasal sinuses
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Satoshi Yokoo, Hirofumi Shimada, Yoshiki Kubota, Tatsuya Ohno, Shuichiro Komatsu, Takashi Nakano, Atsushi Musha, Yuka Komatsu, Katsuyuki Shirai, Jun-ichi Saitoh, and Takanori Abe
- Subjects
lcsh:Medical physics. Medical radiology. Nuclear medicine ,Radiation ,business.industry ,lcsh:R895-920 ,medicine.medical_treatment ,Head and neck tumors ,Dentistry ,lcsh:Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,medicine.disease ,lcsh:RC254-282 ,030218 nuclear medicine & medical imaging ,Radiation therapy ,03 medical and health sciences ,0302 clinical medicine ,medicine.anatomical_structure ,Paranasal sinuses ,Tongue ,030220 oncology & carcinogenesis ,medicine ,Mucositis ,Carbon Ion Radiotherapy ,Radiology, Nuclear Medicine and imaging ,business - Abstract
Mouthpieces are used to fix the positions of the lower jaw and teeth during carbon-ion radiotherapy for head and neck tumors. We used a customized mouthpiece to reduce radiation mucositis by displacing the tongue. Acute radiation mucositis gradually increased for the palate and tongue after approximately six irradiation fractions (maximal mean grade: palate, 2.5 during radiation fractions 15; tongue, 0.8 during radiation fractions 12 and 13). The mean grade of mucositis was significantly lower for the tongue than for the palate from irradiation fraction six until two weeks after irradiation. Keywords: Carbon-ion radiotherapy, Head and neck tumor, Customized mouthpiece
- Published
- 2017
28. Combined effects of irrigation amount and nitrogen load on growth and needle biochemical traits of Cryptomeria japonica seedlings
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Yuichiro Terada, Hirofumi Shimada, Akira Motai, Masahiro Yamaguchi, Takeshi Izuta, Daiki Saito, and Ayumi Kobayashi
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0106 biological sciences ,Irrigation ,010504 meteorology & atmospheric sciences ,Ecology ,biology ,Physiology ,Cryptomeria ,chemistry.chemical_element ,Plant physiology ,Forestry ,Plant Science ,biology.organism_classification ,Photosynthesis ,medicine.disease ,01 natural sciences ,Nitrogen ,Japonica ,Horticulture ,chemistry ,Agronomy ,Dry weight ,medicine ,Dehydration ,010606 plant biology & botany ,0105 earth and related environmental sciences - Abstract
Growth of C. japonica under highly irrigated and N-loaded soil is noticeable because of N-induced increase of needle mass and alleviation of high irrigation-induced reduction in photosynthesis. To clarify the combined effects of change in precipitation amount and increasing nitrogen load on Japanese forest trees, 2-year-old seedlings of Cryptomeria japonica were treated with combinations of four irrigation levels (80, 100, 120, or 140% of annual precipitation) and three nitrogen loads (15, 50, or 100 kg ha−1 year−1). The 100% of annual precipitation corresponded to 1520 mm year−1 which was the average annual precipitation in the habitats of C. japonica in Japan. High irrigation amount significantly enhanced the whole-plant dry mass of the seedlings. The N load significantly enhanced the extent of high irrigation-induced increase in needle dry mass. As a result, the irrigation-induced increase in the whole-plant dry mass was greater in the treatment with the highest N. However, increase in needle dry mass induced by high irrigation enhanced plant water consumption and caused dehydration and oxidative damage in needles, thus resulting in reduced net photosynthetic rate. The high irrigation-induced reduction in net photosynthetic rate was alleviated by N load. This alleviation was not caused by N load-induced changes in antioxidative capacity but by a N load-induced increase in ribulose 1,5-bisphosphate carboxylase/oxygenase activity. These results indicate that an increase in the whole-plant dry mass of C. japonica seedlings grown in highly irrigated and N-loaded soil was attributed to N load-induced enhancement of high irrigation-induced increase in needle dry mass and alleviation of high irrigation-induced reduction in net photosynthetic rate.
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- 2017
29. Diagnosing and discriminating between primary and secondary aneurysmal bone cysts
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Yasuhiro Ishidou, Takao Setoguchi, Hirofumi Shimada, Masahiro Yokouchi, Kosuke Maehara, Setsuro Komiya, Satoshi Nagano, Hiromi Sasaki, and Osamu Kunigou
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Cancer Research ,medicine.medical_specialty ,Pathology ,medicine.medical_treatment ,Biology ,Chondroblastoma ,03 medical and health sciences ,0302 clinical medicine ,differential diagnosis ,medicine ,biopsy ,Giant Cell Tumors ,giant cell tumor ,030222 orthopedics ,Fibrous dysplasia ,Articles ,Aneurysmal bone cyst ,medicine.disease ,Curettage ,Telangiectatic Osteosarcoma ,Oncology ,aneurysmal bone cyst ,030220 oncology & carcinogenesis ,telangiectatic osteosarcoma ,fluid-fluid level ,Radiology ,Fibroma ,Differential diagnosis - Abstract
Aneurysmal bone cysts (ABCs) are benign bony lesions frequently accompanied by multiple cystic lesions and aggressive bone destruction. They are relatively rare lesions, representing only 1% of bone tumors. The pathogenesis of ABCs has yet to be elucidated. In the present study, a series of 22 cases of primary and secondary ABC from patients treated in Department of Orthopedic Surgery, Kagoshima University Hospital (Kagoshima, Japan) from 2001–2015 were retrospectively analyzed. The average age at the time of diagnosis of primary ABC was 17.9 years. Intralesional curettage and artificial bone grafting were performed in the majority of the patients with primary ABC. The local recurrence rate following curettage for primary ABC was 18%, and the cause of local recurrence was considered to be insufficient curettage. Although no adjuvant therapy was administered during the surgeries, it may assist the prevention of local recurrence in certain cases. The cases of secondary ABC were preceded by benign bone tumors, including fibrous dysplasia, giant cell tumors, chondroblastoma and non-ossifying fibroma. The features of the secondary ABC typically reflected those of the preceding bone tumor. In the majority of cases, distinguishing the primary ABC from the secondary ABC was possible based on characteristic features, including age of the patient at diagnosis and the tumor location. In cases that exhibit ambiguous features, including a soft tissue mass or a thick septal enhancement on the preoperative magnetic resonance images, a biopsy must be obtained in order to exclude other types of aggressive bone tumors, including giant cell tumor, osteosarcoma and telangiectatic osteosarcoma.
- Published
- 2017
30. Severe subclavian artery stenosis presenting with subclavian steal syndrome by head rotation: a case report
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Munetoshi Yasuda, Hayato Takaki, Yoshinobu Horio, Hirofumi Shimada, Dai Kawano, Koichiro Takemoto, Noriyuki Sahara, Tooru Inoue, Seisaburo Sakamoto, and Takahisa Koga
- Subjects
medicine.medical_specialty ,Subclavian artery stenosis ,business.industry ,medicine ,medicine.disease ,Head rotation ,business ,Subclavian steal syndrome ,Surgery - Published
- 2017
31. Evaluation before and after treatment of dural arteriovenous fistulas by carotid ultrasonography
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Akira Matsunaga, Tooru Inoue, Toshiyasu Ogata, Takaaki Yamashita, Toshio Higashi, Hirofumi Shimada, and Emiko Hisaeda
- Subjects
medicine.medical_specialty ,business.industry ,Carotid ultrasonography ,General Medicine ,medicine.disease ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Dural arteriovenous fistulas ,medicine ,Radiology ,business ,030217 neurology & neurosurgery ,After treatment - Published
- 2017
32. Computer-assisted quantitative evaluation of bisphosphonate treatment for Paget's disease of bone using the bone scan index
- Author
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Satoshi Nagano, Yasuhiro Ishidou, Takao Setoguchi, Shunsuke Nakamura, Hiromi Sasaki, Masahiro Yokouchi, Hirofumi Shimada, and Setsuro Komiya
- Subjects
bisphosphonate ,Cancer Research ,Deoxypyridinoline ,Pathology ,medicine.medical_specialty ,medicine.medical_treatment ,Urinary system ,computer-assisted analytical system ,Urology ,bone metabolic marker ,Bone resorption ,030218 nuclear medicine & medical imaging ,Bone remodeling ,03 medical and health sciences ,chemistry.chemical_compound ,0302 clinical medicine ,Immunology and Microbiology (miscellaneous) ,Medicine ,bone scintigraphy ,medicine.diagnostic_test ,business.industry ,Articles ,General Medicine ,Bisphosphonate ,medicine.disease ,Paget's disease of bone ,Bone scintigraphy ,chemistry ,030220 oncology & carcinogenesis ,business ,human activities ,Type I collagen - Abstract
The purpose of the present study was to analyze the effect of treatment of Paget's disease of bone (PDB) with bone scintigraphy using a computer-assisted diagnosis system (BONENAVI) that quantitatively evaluates bone metabolism. Seven patients with PDB (three male, four female; average age, 60 years; age range, 33–80 years) underwent bone scintigraphy and measurement of serum alkaline phosphatase (ALP), bone-specific ALP (BAP), serum cross-linked N-telopeptide (NTx) of type I collagen, urinary NTx, and deoxypyridinoline (DPD) before and after bisphosphonate treatment. Bone scan index (BSI), artificial neural network (ANN) value, and hotspot number (HSn) were calculated using BONENAVI software. Mean follow-up period was 22 months (range, 11–35 months). Among three BONENAVI parameters (ANN, BSI, and HSn), only BSI was significantly lower after bisphosphonate treatment as compared with before. All bone metabolic markers excluding DPD were significantly lower following bisphosphonate treatment than before. Bone formation markers (ALP and BAP) were significantly lower than bone resorption markers (U-NTx and S-NTx). The correlation of BONENAVI parameters with four bone metabolic markers was analyzed before and after bisphosphonate treatment. Before treatment, the majority of the four markers did not correlate with the BONENAVI parameters. In contrast, post-treatment ALP, BAP, and U-NTx were significantly correlated with BSI and HSn. To the best of our knowledge, this is the first study to evaluate the treatment of PDB by bone scintigraphy using a computer-assisted diagnosis system that quantitatively evaluates bone metabolism. The findings demonstrated that, using BONENAVI software, bone scintigraphy is able to quantitatively and spatially evaluate the bisphosphonate treatment effect, particularly in patients with polyostotic PDB.
- Published
- 2016
33. Corrigendum: Beam range estimation by measuring bremsstrahlung (2012Phys. Med. Biol.572843)
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Takashi Nakano, Shin Watanabe, Shu Fujimaki, Mitsutaka Yamaguchi, Naoki Kawachi, Tomihiro Kamiya, Hirofumi Shimada, Motohide Kokubun, Yuto Nagao, Tadayuki Takahashi, Kazuo Arakawa, Takahiro Satoh, and Kota Torikai
- Subjects
010302 applied physics ,Physics ,Range (particle radiation) ,Radiological and Ultrasound Technology ,business.industry ,Bremsstrahlung ,01 natural sciences ,030218 nuclear medicine & medical imaging ,Nuclear physics ,03 medical and health sciences ,0302 clinical medicine ,0103 physical sciences ,Radiology, Nuclear Medicine and imaging ,Nuclear medicine ,business ,Beam (structure) - Published
- 2016
34. Detection of a gas region in a human body across a therapeutic carbon beam by measuring low-energy photons
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Kota Torikai, Yuto Nagao, Tomihiro Kamiya, Hirofumi Shimada, Takashi Nakano, Shu Fujimaki, Kazuo Arakawa, Makoto Sakai, Mitsutaka Yamaguchi, Takahiro Satoh, Naoki Kawachi, and Hiroyuki Sugai
- Subjects
Physics ,Beam diameter ,Photon ,business.industry ,Bremsstrahlung ,Collimator ,01 natural sciences ,Secondary electrons ,030218 nuclear medicine & medical imaging ,law.invention ,Semiconductor detector ,03 medical and health sciences ,0302 clinical medicine ,Optics ,law ,0103 physical sciences ,Physics::Accelerator Physics ,Laser beam quality ,Atomic physics ,010306 general physics ,business ,Beam (structure) - Abstract
We studied feasibility of detection of a gap which is located across a beam track by measuring low-energy (63–68 keV) photons generated by beam irradiation. An experiment was performed with the Heavy Ion Medical Accelerator in Chiba (HIMAC). A 12C beam having 290 MeV/u was injected on a target consisting of two acrylic blocks. These two blocks were placed with a 10 mm gap along the beam axis. A detection system consisting of a semiconductor detector, a lead collimator having a slit, and borated polyethylene blocks was placed on a movable stage to detect low-energy photons emitted perpendicularly to the beam axis. The position of the detection system was moved at 2 mm intervals along the beam axis. It was found that the yield of 63–68 keV photons was clearly correlated with the position of the detection system. The position at which the yield curve had the lowest value agreed with the gap position. We also confirmed that the experimental result was well reproduced by a Monte Carlo simulation that includes generation of secondary electron bremsstrahlung.
- Published
- 2016
35. Intra-Plaque Vessels on Contrast-Enhanced Ultrasound Sonography Predict Carotid Plaque Histology
- Author
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Noriyuki Sakata, Takaaki Amamoto, Tooru Inoue, Hirofumi Shimada, and Toshiyasu Ogata
- Subjects
Carotid Artery Diseases ,Male ,medicine.medical_specialty ,medicine.medical_treatment ,Biopsy ,Iron ,Contrast Media ,Carotid endarterectomy ,030204 cardiovascular system & hematology ,Ferric Compounds ,03 medical and health sciences ,0302 clinical medicine ,Predictive Value of Tests ,Medicine ,Humans ,Prospective Studies ,Registries ,Ultrasonography, Interventional ,Aged ,Endarterectomy, Carotid ,Microbubbles ,Receiver operating characteristic ,Rupture, Spontaneous ,business.industry ,Ultrasound ,Echogenicity ,Reproducibility of Results ,Oxides ,medicine.disease ,Plaque, Atherosclerotic ,Stenosis ,Carotid Arteries ,Neurology ,Histopathology ,Female ,Neurology (clinical) ,Cardiology and Cardiovascular Medicine ,business ,Nuclear medicine ,030217 neurology & neurosurgery ,Contrast-enhanced ultrasound - Abstract
Background and Purpose: Although the echogenicity of carotid plaques on carotid enhanced ultrasound (CEUS) was reported to correlate with the historological density of intra-plaque neovessels, it is unclear whether the intra-plaque vessel size is associated with carotid plaque vulnerability. We evaluated the relationship of size of intra-plaque vessels on CEUS with carotid plaque histology. Methods: We prospectively registered patients with carotid stenosis who were hospitalized to receive carotid endarterectomy between 2012 and 2016. CEUS was performed by ultrasound specialists using a 7-MHz linear transducer (GE LOGIQ7; GE Healthcare, Milwaukee, WN, USA). Sonazoid® was used for conducting CEUS. The sizes of microbubbles inside the plaques were scored at 0, 1, 3, and 5 min after the injection of contrast agent, and were categorized according to our defined vascular score (Vas-S; 0: the effect of contrast was not recognized; 1: the microbubbles were visible, but so blurred and vague that their shape could not be recognized; 2: dot or string-like microbubbles with movement, localized in part or the whole site of the plaque). At histological examination, we simplified the modified American Heart Association classification and defined as an atherosclerotic category (Ath-cat; 1: unruptured plaque; 2: ruptured plaque; 3: healed plaque). We then assessed the correlation of Vas-S with Ath-cat, which describes the process of rupture and restoration of carotid plaques. Results: A total of 97 patients were included in this study. A higher Ath-cat was significantly associated with higher Vas-S at any time. Spearman signed-rank test indicated that Vas-S at 1 min was most strongly correlated with Ath-cat (ρ = 0.43, p = 0.001). Receiver operating curve analysis indicated that a Vas-S of 0 at 1 min was significantly associated with an unruptured plaque (area under curve [AUC] 0.72, p = 0.006), while a Vas-S of 2 at 1 min was significantly associated with a healed plaque (AUC 0.72, p = 0.001). Conclusion: Vas-S values of 0 and 2 at 1 min indicated unruptured and healed plaques respectively. Thus, a Vas-S of 1 at 1 min is an indicator of a ruptured plaque. The intra-plaque vessel size on CEUS was significantly associated with carotid plaque histology, and may predict the process of plaque rupture and restoration.
- Published
- 2018
36. Evaluation of prognostic scoring systems for bone metastases using single-center data
- Author
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Ichiro Kawamura, Satoshi Nagano, Yasuhiro Ishidou, Hiroyuki Tominaga, Setsuro Komiya, Shunsuke Nakamura, Takao Setoguchi, Hirofumi Shimada, and Masahiro Yokouchi
- Subjects
Cancer Research ,medicine.medical_specialty ,Pathology ,Scoring system ,Performance status ,business.industry ,Bone metastasis ,Cancer ,Articles ,medicine.disease ,Single Center ,Cancer treatment ,Tumor excision ,Oncology ,medicine ,Sarcoma ,Radiology ,business - Abstract
Recent progress in cancer treatment has improved patient survival, but has increased the number of patients with metastatic bone tumors. Data were collected from all bone metastasis patients at Kagoshima University, where almost all patients with metastatic bone tumors who reside in Kagoshima province are treated surgically. The scoring systems used in bone metastasis patients were then evaluated to identify those most suitable for our patients. Clinical data were collected from 145 patients with bone metastases. The patients were assigned prognostic scores based on four scoring systems, namely those described by the Ratasvuori, Mizumoto, Tokuhashi and Katagiri groups. Statistical examinations were performed to assess patient distribution regarding prognostic factors and the four data sets reported in the literature. The patient distributions for all prognostic factors were significantly different between the Scandinavian Sarcoma Group (SSG) and Kagoshima data. The distributions of patients for 3 of 5 and for 5 of 7 prognostic factors were statistically different between the Kagoshima data and the Katagiri and Tokuhashi data, respectively. Additionally, the distribution of patients in each scoring group was statistically different between the Kagoshima data and the Katagiri, Tokuhashi and Mizumoto data. The predictions of prognosis were significantly different between the results of each group and ours. The Tokuhashi scoring system detected the highest survival at 6 months (88.8%) in the Kagoshima data. Patients with a life expectancy of >6 months benefited from tumor excision and reconstruction. These findings suggest that the Tokuhashi scoring system is the most suitable for identifying patients who should be assessed for curative surgical intervention. SSG scoring, however, was suitable for identifying patients expected to survive for
- Published
- 2015
37. Doppler ultrasound for diagnosis of soft tissue sarcoma: efficacy of ultrasound-based screening score
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Ichiro Kawamura, Yuhei Yahiro, Yasuhiro Ishidou, Hiromi Sasaki, Setsuro Komiya, Hirofumi Shimada, Satoshi Nagano, Masahiro Yokouchi, and Takao Setoguchi
- Subjects
medicine.medical_specialty ,R895-920 ,ultrasound-based sarcoma screening score ,Medical physics. Medical radiology. Nuclear medicine ,Vascularity ,differential diagnosis ,Medicine ,Radiology, Nuclear Medicine and imaging ,medicine.diagnostic_test ,Receiver operating characteristic ,business.industry ,Soft tissue sarcoma ,Ultrasound ,Area under the curve ,Magnetic resonance imaging ,medicine.disease ,Surgery ,doppler ultrasound ,Oncology ,Sarcoma ,Radiology ,soft-part tumours ,medicine.symptom ,Differential diagnosis ,business ,Research Article - Abstract
Background. The utility of ultrasound imaging in the screening of soft-part tumours (SPTs) has been reported. We classified SPTs according to their blood flow pattern on Doppler ultrasound and re-evaluated the efficacy of this imaging modality as a screening method. Additionally, we combined Doppler ultrasound with several values to improve the diagnostic efficacy and to establish a new diagnostic tool. Patients and methods. This study included 189 cases of pathologically confirmed SPTs (122 cases of benign disease including SPTs and tumour-like lesions and 67 cases of malignant SPTs). Ultrasound imaging included evaluation of vascularity by colour Doppler. We established a scoring system to more effectively differentiate malignant from benign SPTs (ultrasound-based sarcoma screening [USS] score). Results. The mean scores in the benign and malignant groups were 1.47 ± 0.93 and 3.42 ± 1.30, respectively. Patients with malignant masses showed significantly higher USS scores than did those with benign masses (p < 1 × 10-10). The area under the curve was 0.88 by receiver operating characteristic (ROC) analysis. Based on the cut-off value (3 points) calculated by ROC curve analysis, the sensitivity and specificity for a diagnosis of malignant SPT was 85.1% and 86.9%, respectively. Conclusions. Assessment of vascularity by Doppler ultrasound alone is insufficient for differentiation between benign and malignant SPTs. Preoperative diagnosis of most SPTs is possible by combining our USS score with characteristic clinical and magnetic resonance imaging findings.
- Published
- 2015
38. Evaluation of the change of flow change on opening mouth after superficial temporal artery-middle cerebral artery bypass
- Author
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Akira Matsunaga, Toshiro Katsuta, Tooru Inoue, Hironobu Kawashima, Emiko Hisaeda, Toshiyasu Ogata, Hirofumi Shimada, Hiroshi Abe, and Kenji Fukuda
- Subjects
medicine.medical_specialty ,business.industry ,medicine.artery ,Internal medicine ,Middle cerebral artery ,Cardiology ,Medicine ,business ,Superficial temporal artery ,Surgery - Published
- 2015
39. 6 Treatment Planning
- Author
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Motohiro Kawashima, Hirofumi Shimada, and Mutsumi Tashiro
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Radiation ,business.industry ,Medicine ,Operations management ,business ,Radiation treatment planning - Published
- 2015
40. The usefulness of carotid ultrasonography in identifying direct-type carotid cavernous fistula
- Author
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Toshio Higashi, Akira Matsunaga, Hirofumi Shimada, Kenji Fukuda, Hironobu Kawashima, Tooru Inoue, Emiko Hisaeda, and Toshiyasu Ogata
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medicine.medical_specialty ,business.industry ,Carotid ultrasonography ,Medicine ,Radiology ,business ,medicine.disease ,Carotid-cavernous fistula - Published
- 2015
41. Prognostic factors in patients with skeletal-related events at non-small-cell lung cancer diagnosis
- Author
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Hirofumi Shimada, Hiroyuki Tominaga, Hiromasa Inoue, Yasuhiro Ishidou, Keiko Mizuno, Masami Sato, Setsuro Komiya, Satoshi Nagano, Hiromi Sasaki, and Takao Setoguchi
- Subjects
0301 basic medicine ,Oncology ,Cancer Research ,medicine.medical_specialty ,Performance status ,Proportional hazards model ,medicine.medical_treatment ,Cancer ,Bone metastasis ,Articles ,Biology ,medicine.disease ,Metastasis ,Radiation therapy ,03 medical and health sciences ,030104 developmental biology ,0302 clinical medicine ,030220 oncology & carcinogenesis ,Internal medicine ,medicine ,Risk factor ,Lung cancer ,neoplasms - Abstract
The aim of the present study was to detect prognostic factors in patients with skeletal-related events (SREs) and bone metastasis at the time of non-small-cell lung cancer (NSCLC) diagnosis. A total of 85 NSCLC patients were retrospectively enrolled, 47 (55.2%) of whom presented with SREs at the time of NSCLC diagnosis. Multivariate logistic regression analysis identified squamous cell carcinoma as a risk factor for SRE. Kaplan-Meier analysis demonstrated that there was no difference in the overall survival between the SRE and no SRE groups. Cox hazard model revealed that a higher Eastern Cooperative Oncology Group (ECOG) performance status (PS) score was a risk factor for poor prognosis, while surgery for bone metastasis and molecular-targeted therapy were factors for better prognosis in patients with SREs at the time of NSCLC diagnosis. Multivariate analysis revealed that a higher ECOG PS score and metastasis to the adrenal gland were risk factors for poor prognosis, while surgery for bone metastasis and molecular-targeted therapy were factors for better prognosis. Thus, while surgical treatment and molecular-targeted therapy appear to improve the prognosis of patients with bone metastasis at the time of NSCLC diagnosis, those with a higher ECOG PS score and adrenal metastasis may benefit more from radiotherapy or supportive care.
- Published
- 2017
42. Acceleration of blood flow as an indicator of improved hemodynamics after indirect bypass surgery in Moyamoya disease
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Tooru Inoue, Hirofumi Shimada, Kenji Fukuda, Toshiro Katsuta, Sayaka Ogawa, Toshiyasu Ogata, and Hiroshi Abe
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Adult ,Male ,medicine.medical_specialty ,Ultrasonography, Doppler, Transcranial ,Hemodynamics ,digestive system ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,medicine.artery ,Outcome Assessment, Health Care ,Medicine ,Humans ,Moyamoya disease ,Cerebral Revascularization ,business.industry ,Brain ,General Medicine ,Blood flow ,Middle Aged ,medicine.disease ,University hospital ,Superficial temporal artery ,Trunk ,Temporal Arteries ,Bypass surgery ,EDAS ,Surgery ,Female ,Vascular Resistance ,Neurology (clinical) ,Radiology ,Moyamoya Disease ,business ,030217 neurology & neurosurgery ,Blood Flow Velocity ,Follow-Up Studies - Abstract
The ultrasonography findings in the superficial temporal artery (STA) in Moyamoya disease patients treated with indirect bypass remain unclear. We evaluated the time-related changes in ultrasonography findings of the STA main trunk and branches in patients with Moyamoya disease who underwent encephalo-duro-arterio-synangiosis (EDAS).Patients (n=21, 30 sides) with Moyamoya disease who underwent EDAS at Fukuoka University Hospital were prospectively registered between 2008 and 2015. EDAS using the frontal and parietal branches of the STA was adopted in an indirect bypass procedure. Mean velocity (MV) and resistance index (RI) were used as ultrasonography markers, and their changes over time in the STA main trunk and branches were assessed.There was a significant increase in MV in both the STA main trunk (p=0.001) and branches (frontal: p=0.005, parietal: p=0.003) at 3 months after EDAS, whereas there was a decrease in RI at 14days after EDAS (main trunk: p0.001, frontal: p0.001, parietal: p=0.014). In subgroup analysis of patients divided by EDAS outcome, compared with before EDAS, there were significant differences at 3 months after EDAS in MV (responders: main trunk: p=0.002, frontal: p=0.001, parietal: p=0.001; non-responders: main trunk: p=0.093, frontal: p=0.24, parietal: p=0.96) and RI (responders: main trunk: p0.001, frontal: p0.001, parietal: p=0.006; non-responders: main trunk: p=0.17, frontal: p=0.12, parietal: p=0.17).Measurement of MV may be useful for predicting outcome at 3 months after EDAS.
- Published
- 2017
43. Clinical course of the bony lesion of single-system single-site Langerhans cell histiocytosis - Is appropriate follow-up sufficient treatment?
- Author
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Shunsuke Nakamura, Satoshi Nagano, Hiromi Sasaki, Hirofumi Shimada, Takao Setoguchi, and Setsuro Komiya
- Subjects
Male ,medicine.medical_specialty ,Orthotic Devices ,Time Factors ,Adolescent ,medicine.medical_treatment ,Clinical Decision-Making ,Methylprednisolone ,Multimodal Imaging ,Risk Assessment ,Severity of Illness Index ,Sampling Studies ,030218 nuclear medicine & medical imaging ,Lesion ,03 medical and health sciences ,0302 clinical medicine ,Langerhans cell histiocytosis ,Japan ,Positron Emission Tomography Computed Tomography ,Biopsy ,medicine ,Humans ,Orthopedics and Sports Medicine ,Child ,Retrospective Studies ,medicine.diagnostic_test ,business.industry ,Biopsy, Needle ,Magnetic resonance imaging ,medicine.disease ,Combined Modality Therapy ,Immunohistochemistry ,Magnetic Resonance Imaging ,Orthotic device ,Curettage ,Surgery ,Histiocytosis ,Histiocytosis, Langerhans-Cell ,Treatment Outcome ,030220 oncology & carcinogenesis ,Child, Preschool ,Orthopedic surgery ,Female ,medicine.symptom ,Bone Diseases ,business ,Follow-Up Studies - Abstract
Background Langerhans cell histiocytosis (LCH) is categorized into three types, which include single-system single-site (SS-s), single-system multiple-site (SS-m) and multisystem (MS). The most commonly affected site in LCH is bone, and the bony lesion of SS-s LCH has a good prognosis. The bony lesion of SS-s LCH has been thought to regress spontaneously. Although treatments such as curettage, direct injection of corticosteroids, and chemotherapy have been performed, regular follow-up is the first line of treatment for the bony lesion of SS-s LCH. For preventing orthopedic sequelae, strict and appropriate follow-up should be performed, but the appropriate period and method of follow-up has not yet been established. Methods In the present study, we retrospectively analyzed a series of 7 cases of patients with SS-s LCH with a bony lesion treated in the Department of Orthopedic Surgery at Kagoshima University Hospital (Kagoshima, Japan) from 2006 to 2015. Results The bony lesion regressed spontaneously in all patients. Factors such as location, size, preoperative C-reactive protein (CRP) value, standardized uptake (SUV) value of positron emission tomography (PET), age, sex and direct steroid injection were not related to the clinical course. Temporary expansion of the lesion occurred in 3 patients and a temporary worsening of pain occurred in 1 patient during the follow-up period. These events occurred within 6 weeks after biopsy. Conclusion Careful follow-up and the use of an appropriate orthosis can lead to a good clinical course for the bony lesion of SS-s LCH. Future research should seek to determine the appropriate follow-up period.
- Published
- 2017
44. Extended curettage and heat ablation for desmoplastic fibroma of the distal femur with a 12-year follow-up period: A case report
- Author
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Hirofumi Shimada, Ichiro Kawamura, Masahiro Yokouchi, Setsuro Komiya, Yoshinori Ueno, Shunsuke Nakamura, Satoshi Nagano, Yasuhiro Ishidou, and Takao Setoguchi
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Cancer Research ,medicine.medical_specialty ,Artificial bone ,business.industry ,medicine.medical_treatment ,bone graft ,Tumor resection ,heat ablation ,Articles ,desmoplastic fibroma ,Ablation ,medicine.disease ,bone ,Curettage ,Surgery ,body regions ,stomatognathic diseases ,Distal femur ,Desmoplastic fibroma ,Primary bone ,Oncology ,medicine ,Primary treatment ,business ,curettage - Abstract
Desmoplastic fibroma is a particularly rare, benign but locally aggressive, primary bone tumor. Owing to previously published reports stating high recurrence rates following curettage, the recommended primary treatment for desmoplastic fibroma is a marginal to wide tumor resection. In the current report, the case of an athlete with desmoplastic fibroma of the distal femur who was treated with extended curettage, heat ablation and artificial bone grafting is described. The postoperative course was uneventful and no recurrence has been observed during the 12-year follow-up period. The patient is able to sit on his heels with a straight back, without pain and is able run a complete marathon.
- Published
- 2014
45. Three-dimensional and Multienergy Gamma-ray Simultaneous Imaging by Using a Si/CdTe Compton Camera
- Author
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Hirokazu Odaka, Shin-nosuke Ishikawa, Takahiro Satoh, Hirofumi Shimada, Tadayuki Takahashi, Kazuo Arakawa, Kota Torikai, Naoki Kawachi, Yoshiyuki Suzuki, Takashi Nakano, Yukari Yoshida, Shin'ichiro Takeda, Shin Watanabe, Shigeki Watanabe, Mitsutaka Yamaguchi, and Hiroyuki Aono
- Subjects
Silicon ,Physics::Instrumentation and Detectors ,Astrophysics::High Energy Astrophysical Phenomena ,Physics::Medical Physics ,chemistry.chemical_element ,Gallium ,Gallium Radioisotopes ,Indium ,Iodine Radioisotopes ,Condensed Matter::Materials Science ,Imaging, Three-Dimensional ,Optics ,Fluorodeoxyglucose F18 ,Cadmium Compounds ,Animals ,Medicine ,Gamma Cameras ,Radiology, Nuclear Medicine and imaging ,Citrates ,Rats, Wistar ,Tomography, Emission-Computed, Single-Photon ,business.industry ,Detector ,Astrophysics::Instrumentation and Methods for Astrophysics ,Gamma ray ,Equipment Design ,Pets ,Cadmium telluride photovoltaics ,Rats ,chemistry ,Tomography ,Radiopharmaceuticals ,Tellurium ,business ,Copper - Abstract
著者人数: 16名, 資料番号: SA1004683000
- Published
- 2013
46. [Carotid Ultrasound]
- Author
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Toshiyasu, Ogata and Hirofumi, Shimada
- Subjects
Carotid Artery Diseases ,Carotid Arteries ,Humans ,Carotid Stenosis ,Carotid Intima-Media Thickness ,Plaque, Atherosclerotic ,Vertebral Artery ,Ultrasonography - Abstract
Carotid ultrasound is used to noninvasively assess the structure of the carotid wall as well as flow velocity of the common carotid, internal carotid, and vertebral arteries. The intima-media thickness and carotid plaque evaluated by carotid ultrasound enables us to assess the degree of patients' atherosclerotic change. They have been reported to be closely associated with atherosclerotic risk factors and future cardiovascular events. Furthermore, carotid ultrasound allows us to evaluate large artery atherosclerosis and its flow velocity, which provides information on the cause of acute ischemic stroke. Regarding the comparison of ultrasound findings of carotid plaque with its pathology, plaque with calcification shows the highest echogenicity, with fibrous carotid plaque showing the second highest. On the other hand, atheromatous plaque and that with hemorrhage in it show the lowest echogenicity, indicating the vulnerability of plaques. Furthermore, carotid plaque with ulceration or mobility leads to the occurrence of ischemic stroke.
- Published
- 2016
47. The impact of interfractional anatomical changes on the accumulated dose in carbon ion therapy of pancreatic cancer patients
- Author
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Hirofumi Shimada, Antonetta C. Houweling, Arjan Bel, Astrid van der Horst, Coen R. N. Rasch, Kyohei Fukata, Tatsuya Ohno, Yoshiki Kubota, and Radiotherapy
- Subjects
medicine.medical_specialty ,Cone beam computed tomography ,Accumulated dose ,Position verification ,Heavy Ion Radiotherapy ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Planned Dose ,Treatment plan ,Fiducial Markers ,Pancreatic cancer ,Planning study ,Anatomical changes ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Retrospective Studies ,Carbon ion therapy ,business.industry ,Stomach ,Radiotherapy Planning, Computer-Assisted ,Radiotherapy Dosage ,Hematology ,Cone-Beam Computed Tomography ,medicine.disease ,Pancreatic Neoplasms ,medicine.anatomical_structure ,Oncology ,030220 oncology & carcinogenesis ,Radiology ,business ,Fiducial marker ,Nuclear medicine - Abstract
Background and purpose: We evaluated the robustness of carbon ion therapy for pancreatic cancer patients by investigating the impact of interfractional anatomical changes on the accumulated dose when using bony anatomy- and fiducial marker-based position verification.Material and methods: Carbon ion treatment plans were created for 9 patients in this retrospective planning study. The planning CT was deformably registered to each daily cone-beam CT (CBCT). The gastrointestinal gas volume visible on each CBCT was copied to these deformed CT images. Subsequently, the fraction doses were calculated by aligning the treatment plan according to a bony anatomy- and a fiducial marker-based registration.We compared the accumulated fraction doses with the planned dose using dose-volume histograms (DVHs) of the internal gross tumour volume (iGTV), internal clinical target volume (iCTV), duodenum, stomach, liver, spinal cord and kidneys.Results: iCTV coverage (D-98%) was on average reduced from 98.6% as planned to 81.9% and 88.6% for the bony anatomy- and marker-based registrations, respectively. DVHs of the duodenum showed large differences between the planned and accumulated dose.Conclusions: Severe reductions in dose coverage of the target due to interfractional anatomical changes were observed in both position verification methods. (C) 2016 Elsevier Ireland Ltd. All rights reserved.
- Published
- 2016
48. Incidence, risk factors, and dose-volume relationship of radiation-induced rib fracture after carbon ion radiotherapy for lung cancer
- Author
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Hirofumi Shimada, Takeshi Ebara, Mutsumi Tashiro, Naoko Okano, Takanori Abe, Jun-ichi Saitoh, Katsuyuki Shirai, Takashi Nakano, and Tatsuya Ohno
- Subjects
Male ,musculoskeletal diseases ,medicine.medical_specialty ,Lung Neoplasms ,Rib Fractures ,Heavy Ion Radiotherapy ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Risk Factors ,Carcinoma, Non-Small-Cell Lung ,Carcinoma ,medicine ,Relative biological effectiveness ,Humans ,Radiology, Nuclear Medicine and imaging ,Radiation Injuries ,Lung cancer ,Aged ,Aged, 80 and over ,Rib cage ,Lung ,business.industry ,Incidence (epidemiology) ,Dose-Response Relationship, Radiation ,Radiotherapy Dosage ,Hematology ,General Medicine ,Middle Aged ,musculoskeletal system ,medicine.disease ,medicine.anatomical_structure ,ROC Curve ,Oncology ,030220 oncology & carcinogenesis ,Carbon Ion Radiotherapy ,Female ,Radiology ,business ,Nuclear medicine ,Relative Biological Effectiveness ,Follow-Up Studies - Abstract
Background: The purpose of this study was to assess the incidence, risk factors, and dose-volume relationship of radiation-induced rib fracture (RIRF) after carbon ion radiotherapy for lung cancer. Material and methods: Fifty-seven ribs of 18 patients with peripheral stage I non-small cell lung cancer treated with carbon ion radiotherapy were analyzed on rib fracture. The patients were treated at a total dose of 52.8 Gy [relative biologic effectiveness (RBE)] or 60.0 Gy (RBE) in 4 fractions and were followed at least six months. Patient characteristics and dosimetric parameters were analyzed for associations with RIRF. Results: Eighteen patients and 57 ribs were included in this study. The median length of follow-up was 36.5 months. RIRF was observed in seven (39%) of the 18 patients, and in 11 (19%) of 57 ribs. Only one patient developed symptomatic fracture. The distance from the ribs to the tumor site was significantly shorter in fractured ribs than in non-fractured ribs (1.4 ± 0.3 cm vs. 2.5 ± 0.3 cm). Receiver operating characteristic curve analysis showed that as a cut-off value for discriminating RIRF had the largest area under the curve (AUC =0.78). Comparison of the two-year cumulative incidence of RIRF among two groups as determined by cut-off values, yielded the following result: 53% vs. 4% [, ≥ 38.2 Gy (RBE) or less]. Results from the two groups were significantly different (p Conclusion: The crude incidence of RIRF after carbon ion radiotherapy was 39% but incidence of symptomatic fracture was low. The as cut-off values may be helpful for discriminating the risk of RIRF.
- Published
- 2016
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49. Contrast-enhanced ultrasonography for detecting histological carotid plaque rupture: Quantitative analysis of ulcer
- Author
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Noriyuki Sakata, Toshiyasu Ogata, Hirofumi Shimada, Omi Hamada, and Tooru Inoue
- Subjects
Male ,medicine.medical_specialty ,medicine.medical_treatment ,media_common.quotation_subject ,Contrast Media ,Carotid endarterectomy ,030204 cardiovascular system & hematology ,03 medical and health sciences ,0302 clinical medicine ,medicine ,Odds Ratio ,Contrast (vision) ,Humans ,Carotid Stenosis ,media_common ,Aged ,Rupture ,Endarterectomy, Carotid ,business.industry ,Plaque rupture ,Echoencephalography ,Plaque, Atherosclerotic ,Neurology ,ROC Curve ,Histopathology ,Female ,Radiology ,Ultrasonography ,business ,Quantitative analysis (chemistry) ,030217 neurology & neurosurgery - Abstract
Background Few studies have evaluated the distinct ability of contrast-enhanced ultrasonography for detecting carotid plaque rupture versus histological observations. Aims The aim of this study was to quantitatively assess the ability of contrast-enhanced ultrasonography to detect plaque rupture compared to ultrasonographic and histological images in terms of geometric accordance. Methods Carotid plaque morphology was classified as “smooth,” “irregular,” or “ulcerated” on 45 conventional ultrasonography and contrast-enhanced ultrasonography images from consecutive patients undergoing endarterectomy, and 55 regions of interests were captured on contrast-enhanced ultrasonography. A comparative study with a receiver operating characteristic analysis was performed using histological findings for reference. Results Contrast-enhanced ultrasonography exhibited a higher percentage of “ulcerated” findings in patients with plaque rupture compared to conventional ultrasonography (P = 0.002) as well as an association with thrombus formation (P = 0.048) and fibrous cap disruption (P Conclusions In our study, contrast-enhanced ultrasonography has high sensitivity for identifying histological plaque rupture, and the measurement of concavity on contrast-enhanced ultrasonography may enable the accurate detection of fibrous cap disruption.
- Published
- 2015
50. Development of head module for multi-head Si/CdTe Compton camera for medical applications
- Author
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Kota Torikai, Tomihiro Kamiya, Hirofumi Shimada, Kazuo Arakawa, Tadayuki Takahashi, Shin-nosuke Ishikawa, Motohide Kokubun, Naoki Kawachi, Hirokazu Odaka, Shin Watanabe, Mitsutaka Yamaguchi, Yukari Yoshida, Yoshiyuki Suzuki, Nobuo Suzui, Takashi Nakano, and Shu Fujimaki
- Subjects
Physics ,Nuclear and High Energy Physics ,Scattering ,business.industry ,Monte Carlo method ,Radiation ,Semiconductor detector ,Optics ,Semiconductor ,Angular resolution ,business ,Instrumentation ,Image resolution ,Energy (signal processing) - Abstract
We are constructing a three-dimensional imaging system for medical and biological applications. The system will allow simultaneous imaging at high spatial and energy resolutions across a wide energy range, from several tens of keV to a few MeV. The system relies on a Si/CdTe semiconductor Compton camera, incorporating state-of-the-art space-observation technology developed by ISAS/JAXA. The Si/CdTe Compton camera was developed for use at moderate temperatures. Moreover, the solid, thin scattering layer allows the target to be placed close to the camera, a good angular resolution corresponds directly to a good spatial resolution. These aspects allow the construction of a compact medical system. In this work, we have developed a prototype head module for a multi-head system. The performance of the prototype was evaluated with a sealed Ba-133 radiation source. The experiments confirmed that the imaging results were consistent with source positioning. The experimental results were also compared with those of a Monte Carlo simulation.
- Published
- 2011
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