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Your search keyword '"Youichirou Iwashita"' showing total 4 results
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4 results on '"Youichirou Iwashita"'

1. Interpretation of distant focal accumulations revealed by bone scintigraphy using Tc-99m HMDP in patients with oral malignant tumors

Author

Youichirou Iwashita, Yasuhiko Morita, Tsuyoshi Sato, Takenori Noikura, and Yoshihiro Kawabata

Subjects
medicine.medical_specialty, Pathology, medicine.diagnostic_test, business.industry, Tc-99m-HMDP, Skeleton (computer programming), Bone scintigraphy, Oral and maxillofacial surgery, Medicine, Radiology, Nuclear Medicine and imaging, Dentistry (miscellaneous), In patient, Skeletal metastasis, Radiology, business
Abstract

Objective Focal accumulations in the skeleton were analyzed in order evaluate the usefulness of bone scintigraphy in the detection of distant skeletal metatases originating from malignant oral tumors.

Published
2000
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2. Abstracts—Dental radiology Vol.38, 1998

Author

Tomokazu Fujiki, Toru Wakasa, Yoshinobu Yanagi, Yasutoshi Honda, Noriko Kawai, Kanji Kishi, Takurou Wada, Yasuhiko Morita, Takashi Hiraoka, Tuyoshi Sato, Takenori Noikura, Yoshihiko Hayakawa, Hitoshi Shibuya, Toshimichi Mori, Mamoru Wakoh, Yoshiko Ota, Kinya Kuroyanagi, Naoya Kakimoto, Shumei Murakami, Atsutosi Nakatani, Souhei Furukawa, Hajime Fuchihata, Ken'ichi Obinata, Tsuyoshi Sawamura, Masanori Kaneko, Keiichi Ohmori, Motoyasu Nakamura, Hidemichi Yuasa, Shinji Okumura, Akiko Hirukawa, Ayae Matsuo, Toshimitsu Todokoro, Munetaka Naitoh, Eiichiro Ariji, Takashi Nakamura, Masahiro Izumi, Maya Sakamoto, Shuichi Higano, Shoki Takahashi, Noriko Kurihara, Takashi Sasano, Masao Yuasa, Kaoru Kobayashi, Chinami Igarashi, Masahiro Imanaka, Akira Yamamoto, Kazuya Honda, Masahiro Ueno, Masao Araki, Kazuo Iwai, Koji Hashimoto, Koji Shinoda, Hiromi Kitagawa, Takuya Harada, Masayuki Yamada, Satoshi Hirose, Kiwako Yamamoto, Chikara Saitou, Hiromasa Nikai, Yosuke Suzuki, Akira Yoshida, Shiro Yasaki, Kimiyo Ichinosawa, Ken-ichiro Ejima, Yoshinori Arai, Takashi Maruyama, Kanae Nishizawa, Akitoshi Kawamata, Masami Fujishita, Youichirou Iwashita, Shigeaki Suenaga, Takuro Taniguchi, Mutsumasa Takahashi, Toshirou Kondoh, Eiichi Honda, Norio Yoshino, Takehito Sasaki, Satoru Shoji, Yoshiyuki Shirakura, Masanori Shozushima, Kimio Sakamaki, Yasuyuki Shimizu, Yoshiko Ariji, Tsuneichi Okano, Osamu Matsui, Jin-ichi Takahashi, Hiroto Iida, Jiro Hasegawa, and Akira Senda

Subjects
Cobalt chromium alloy, medicine.anatomical_structure, Intraoral radiography, Mandibular fossa, Dental radiology, business.industry, Oral and maxillofacial surgery, medicine, Dentistry, Radiology, Nuclear Medicine and imaging, Dentistry (miscellaneous), business
Published
1999
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3. Dynamic scintigraphy with thallium-201 chloride (Tl-201) for the diagnosis of tumors of the head and neck

Author

Kazumasa Sugihara, Yoshihiro Kawabata, Youichirou Iwashita, Yasuhiko Morita, Tsuyoshi Sato, Hiroko P. Indo, Tamotsu Mimura, and Takenori Noikura

Subjects
Adult, Male, Time Factors, Biopsy, Statistics as Topic, Adenoma, Pleomorphic, chemistry.chemical_element, Gallium, Gallium Radioisotopes, Adenocarcinoma, Scintigraphy, Benign tumor, Tumor retention, Medicine, Humans, Neoplasm Invasiveness, Citrates, Thallium, Head and neck, Radionuclide Imaging, General Dentistry, Aged, Aged, 80 and over, Maxillary Neoplasms, Dynamic Scan, Chi-Square Distribution, medicine.diagnostic_test, business.industry, Poorly differentiated, Blood flow, Middle Aged, medicine.disease, Adenolymphoma, Parotid Neoplasms, Thallium Radioisotopes, Otorhinolaryngology, chemistry, Head and Neck Neoplasms, Regional Blood Flow, Carcinoma, Squamous Cell, Scintillation Counting, Surgery, Female, Oral Surgery, Radiopharmaceuticals, business, Nuclear medicine
Abstract

Objective: The purpose of this study was to differentiate between malignant tumors and benign tumors of the head and neck by means of thallium-201 chloride scintigraphy. Study Design: Thallium-201 chloride (Tl-201) scintigraphy and Ga-67 citrate (Ga-67) scintigraphy were performed in 10 patients with a benign tumor and in 90 patients with a malignant tumor. The blood flow index and the tumor retention index were obtained by means of Tl-201 scintigraphy. The blood flow index = the count of tumor/the count of control in the early dynamic scan from 30 to 120 seconds after injection, and the tumor retention index = (the count of tumor/the count of control in the delayed dynamic scan 2.5 hours after injection)/(the count of tumor/the count of control in the early dynamic scan from 4 to 5 minutes after injection). Results: The early and delayed scans with Tl-201 demonstrated a very high correlation with the blood flow index. The tumor retention index had a tendency to increase in malignant tumors, especially in the poorly differentiated tumors and the severely invasive tumors. Likewise, the tumor retention index decreased in benign tumors. These results proved to be statistically significant, and in turn Tl-201 scintigraphy was deemed superior to Ga-67 scintigraphy. Tl-201 scintigraphy was also useful in detecting small-size tumors. Conclusion: The tumor retention index of Tl-201 was useful for the differentiation of malignant tumors of the head and neck from benign tumors of the same areas. (Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2001;92:228-35)

Published
2001

4. Ion Beam Excited Acoustic Image and Specific Element Image of Teeth

Author

Hiroto Tateno, Kazunori Kawano, Youichirou Iwashita, Takenori Noikura, and Teruo Ono

Subjects
Materials science, Microscope, Ion beam, business.industry, Physics::Medical Physics, General Engineering, General Physics and Astronomy, Ion, law.invention, Optics, Amplitude, Transducer, law, Excited state, Elasticity (economics), business, Ion energy
Abstract

The ion beam excited acoustic microscope (IAM) is a new microscope which provides visual representations of the elastic waves caused by localized chopping ion energy. Topographs of ultrasonic attenuation and local elastic variations were obtained by measuring frequency and amplitude at a composite resonant point between transducer and sample. Specific ion images were also obtained from the same measurement. In this paper, the IAM and observed topographs and intensity modulated images of the specific ions are described. The elasticity of the hydroxyapatite crystal of the teeth is examined.

Published
1986
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