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2. Development of Volumetric Quantitative Evaluation Software for Assessing Respiratory-Induced Target Motion.

Author

Miura, H., Tanooka, M., Ishihara, S., Kenjo, M., Nakao, M., Ozawa, S., and Kagemoto, M.

Subjects
*VECTOR fields, *IMAGE registration, *COMPUTED tomography, *SCHEDULING, *QUANTITATIVE research
Abstract

Most respiratory-induced target motion data have been measured at only a few points, the centroid and the edge. Due to organ deformation, volumetric measurement is more appropriate than point measurement. Previously, we proposed a quantitative method to evaluate respiratory-induced organ motion using deformable image registration (DIR), called vector volume histogram (VVH). However, the process of VVH was very complicated and no one can use the VVH because the deformation vector field (DVF) was calculated on the treatment planning system (TPS) and the file format was converted by in-house software. We developed a volumetric quantitative evaluation user-friendly software to evaluate respiratory-induced organ motion using DIR. The B-spline-based DIR algorithm was used to compute the DVF, which includes DVF LR (left-right), DVF AP (anterior-posterior), and DVF CC (cranio-caudal). The VVH function was written in Python. Two sets of images were required for DIR in the VVH software: a reference image set and a registered image set. The VVH was a calculation method similar to the dose volume histogram. In the VVH software, the user could change the result of the direction by selecting a combo box. Other features included a calculation index, changing the range of the x and y axes, a tracking bar, and exporting to a CSV file. A displaced target within a moving phantom was used to evaluate the performance of the VVH system. The 2 cm diameter target was systematically displaced 5, 10, 15, and 20 mm in the CC direction. To evaluate respiration-induced target motion, the VVH method was applied to the inhalation and exhalation phases of 4D CT scans in 5 patients with lung cancer. L 5% (length at 5% volume) and L 50% (length at 50% volume) were calculated to evaluate target motion. Target centroid was measured for comparison with VVH methods. In the phantom study, L 5% and L 50% were 5 mm versus 4.7 mm, 9.7 mm versus 10.3 mm, 14.7 mm versus 14.9 mm, and 19.7 mm versus 20.0 mm for displacements of 5, 10, 15, and 20 mm, respectively. In the patient study, the average difference between the L 5% and L 50% methods and the centroid methods was as follows: L 5% and L 50% were 0.2 mm versus 0.5 mm, 0.3 mm versus 0.6 mm, and 2.0 mm versus 0.8 mm in the LR, AP, and CC directions, respectively. Although it was difficult to decide which index to use, the centroid and L 50% results were close. The performance of VVH depends on the accuracy of the DIR algorithm and the extent of anatomic changes. The performance of the VVH software was demonstrated by verifying the phantom and the patient with tumor motion. The VVH software provided a volumetric quantitative assessment of respiratory-induced target motion, which in its clinical application can provide strategy-decision at the time of treatment planning. [ABSTRACT FROM AUTHOR]

Published
2024
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4. PO-1173 Previous pneumectomy is a risk factor of severe radiation pneumonitis after IMRT for lung cancer

Author

Tatsuno, S., primary, Doi, H., additional, Okada, W., additional, Inoue, E., additional, Nakamura, K., additional, Sano, K., additional, Wada, Y., additional, Uehara, T., additional, Inada, M., additional, Nakamatsu, K., additional, Monzen, K., additional, Hosono, M., additional, Matsumoto, K., additional, Tanooka, M., additional, Tanaka, M., additional, and Nishimura, Y., additional

Published
2021
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6. EP-1753: Sensing ability of EPID-based in vivo dosimetry for VMAT

Author

Tanooka, M., primary, Tarutani, K., additional, Doi, H., additional, Suzuki, H., additional, Takada, Y., additional, Fujiwara, M., additional, Toda, Y., additional, Fujimoto, H., additional, Miyashita, M., additional, Okumura, A., additional, Kagawa, K., additional, Kamikonya, N., additional, and Yamakado, K., additional

Published
2018
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11. Pravastatin Reduces Radiation-Induced Damage to Normal Tissues

Author

Doi, H., primary, Matsumoto, S., additional, Odawara, S., additional, Shikata, T., additional, Tanooka, M., additional, Kitajima, K., additional, Takada, Y., additional, Fujiwara, M., additional, Tsujimura, T., additional, Kamikonya, N., additional, and Hirota, S., additional

Published
2016
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13. On the Accuracy of Automatic 4D Tumor Registration Between Planning CT and On-board CBCT Under Different Breathing Conditions: A Phantom Study

Author

Tanooka, M., primary, Inoue, H., additional, Nakajima, H., additional, Harui, S., additional, Masai, N., additional, Odawara, S., additional, Fujiwara, M., additional, Kosaka, K., additional, Tarutani, K., additional, Shibayama, M., additional, Wakayama, T., additional, Uehigashi, J., additional, Nakamura, E., additional, Sakai, T., additional, Nasada, T., additional, Yasumasa, K., additional, Sakamoto, K., additional, Doi, H., additional, Niwa, Y., additional, Takada, Y., additional, and Kamikonya, N., additional

Published
2015
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15. 2035 Diffusion-weighted magnetic resonance imaging for the prediction of the tumor response to neoadjuvant chemoradiotherapy using irinotecan plus S-1 for rectal cancer

Author

Doi, H., primary, Beppu, N., additional, Kato, T., additional, Tanooka, M., additional, Kengo, K., additional, Tarutani, K., additional, Suzuki, H., additional, Odawara, S., additional, Niwa, Y., additional, Takada, Y., additional, Fujiwara, M., additional, Noda, M., additional, Tomita, N., additional, Kamikonya, N., additional, and Hirota, S., additional

Published
2015
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17. 609 Pravastatin protects normal intestinal epithelium and normal lung from radiation-induced cell death

Author

Doi, H., primary, Odawara, S., additional, Matsumoto, S., additional, Shikata, T., additional, Suzuki, H., additional, Kato, T., additional, Tarutani, K., additional, Kosaka, K., additional, Inoue, H., additional, Tanooka, M., additional, Takada, Y., additional, Tsujimura, T., additional, Kamikonya, N., additional, and Hirota, S., additional

Published
2015
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24. Hypothyroidism After Radiation Therapy for Head-and-Neck Cancer: The Retrospective DVH Analysis of 75 Patients -- Volume of Thyroid Gland Spared From Doses Can Be a New Dose Constraint for Treatment Planning?

Author

Fujiwara, M., primary, Kamikonya, N., additional, Tanooka, M., additional, Miura, H., additional, Doi, H., additional, Takada, Y., additional, Terada, T., additional, Uwa, N., additional, Sagawa, K., additional, and Hirota, S., additional

Published
2012
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35. 914 poster LATE RECTAL TOXICITY FOLLOWING IRRADIATION IN RATS

Author

Doi, H., primary, Kamikonya, N., additional, Takada, Y., additional, Fujiwara, M., additional, Tsuboi, K., additional, Miura, H., additional, Inoue, H., additional, Tanooka, M., additional, Nakamura, T., additional, Shikata, T., additional, Tsujimura, T., additional, and Hirota, S., additional

Published
2011
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36. 1096 poster NOVEL SPIRAL PHANTOM FOR VOLUMETRIC MODULATED ARC THERAPY DELIVERY VERIFICATION

Author

Tanooka, M., primary, Inoue, H., additional, Doi, H., additional, Takada, Y., additional, Fujiwara, M., additional, Okuhata, K., additional, Ishimaru, F., additional, Yamashita, T., additional, Sakai, T., additional, Nakagawa, H., additional, Oda, M., additional, Yasumasa, K., additional, Sakamoto, K., additional, Kamikonya, N., additional, and Hirota, S., additional

Published
2011
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41. 2750

Author

Kamikonya, N., primary, Takada, Y., additional, Fujiwara, M., additional, Tsuboi, K., additional, Nakao, N., additional, Nakagawa, H., additional, Tanooka, M., additional, Yamamoto, E., additional, Inoue, H., additional, and Yasumasa, K., additional

Published
2006
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43. 169. Digital Radiography in Gastric Mass Survey

Author

Tanooka, M., primary, Matuura, H., additional, Imamura, H., additional, Ishii, N., additional, Asai, H., additional, Ogawa, M., additional, Teranishi, T., additional, Shimoura, Y., additional, Itoh, H., additional, and Aoki, H., additional

Published
1992
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46. Exploring feasibility criteria for stereotactic radiosurgical treatment of multiple brain metastases using five linac machines.

Author

Sakai Y, Kubo K, Monzen H, Ueda Y, Tanooka M, Miyazaki M, Ishii K, and Kawamorita R

Subjects
Humans, Organs at Risk radiation effects, Prognosis, Male, Female, Brain Neoplasms secondary, Brain Neoplasms surgery, Brain Neoplasms radiotherapy, Radiosurgery methods, Radiotherapy Planning, Computer-Assisted methods, Feasibility Studies, Radiotherapy Dosage, Particle Accelerators instrumentation, Radiotherapy, Intensity-Modulated methods
Abstract

Purpose: This study aimed to find descriptors that correlates with normal brain dose to determine the feasibility of performing fractionated stereotactic radiosurgery (SRS) for multiple brain metastases (BMs) using five linac machines., Methods: Thirty-two patients with 1-30 BMs were enrolled. Treatment plans were created using TrueBeam, Novalis Tx, TrueBeam Edge, Halcyon, and Tomotherapy linacs. The sum of all planning target volumes (PTVs) was defined as PTV all , and the brain region excluding PTV all was defined as normal brain. The total surface area (TSA) of the PTV was calculated from the sum of the surface areas of the equivalent spheres for each PTV. Volumes receiving more than 5, 12, and 18 Gy (V 5Gy , V 12Gy , and V 18Gy , respectively) were used for evaluation of normal brain dose. Correlations between normal brain dose and each tumor characteristic (number, PTV all , and TSA) were investigated using the Spearman rank correlation coefficient., Results: Correlations between each characteristic and normal brain dose were statistically significant (p < 0.05) across all machines. The correlation coefficients between each characteristic and V 18Gy for the five machines were as follows: tumor number, 0.39-0.60; PTV all , 0.79-0.93; TSA, 0.93-0.99. The fit equations between TSA and V 18Gy exhibited high coefficients of determination, ranging from 0.92 to 0.99 across five machines., Conclusion: This study devised fractionated SRS plans using for 1-30 BMs across five linac machines to find descriptors for determining SRS feasibility based on normal brain dose. TSA proved to be a promising descriptor of SRS feasibility for treating multiple BMs., (© 2024 The Author(s). Journal of Applied Clinical Medical Physics published by Wiley Periodicals LLC on behalf of American Association of Physicists in Medicine.)

Published
2024
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47. Stereotactic Body Radiation Therapy for Prostate Cancer Using Tomotherapy With Synchrony Fiducial Tracking.

Author

Shintani T, Anami S, Sano K, Okada W, and Tanooka M

Abstract

Numerous prospective and retrospective studies have demonstrated the efficacy and safety of stereotactic body radiation therapy (SBRT) for prostate cancer. Since SBRT utilizes a very tight margin, management of intrafraction prostate motion is necessary. As a real-time motion tracking and correction system (Synchrony; Accuray, Sunnyvale, CA) has been introduced in the newer platform of tomotherapy (Radixact; Accuray), Radixact can deliver tracking SBRT. In the case report, we present the first clinical experience with prostate SBRT using tomotherapy with Synchrony fiducial tracking., Competing Interests: The authors have declared that no competing interests exist., (Copyright © 2023, Shintani et al.)

Published
2023
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48. Optimal threshold of a control parameter for tomotherapy respiratory tracking: A phantom study.

Author

Sano K, Fujiwara M, Okada W, Tanooka M, Takaki H, Shibata M, Nakamura K, Sakai Y, Suzuki H, Takahashi K, Tanaka M, and Yamakado K

Subjects
Humans, Phantoms, Imaging, Motion, Radiometry, Radiotherapy, Intensity-Modulated, Neoplasms radiotherapy
Abstract

Background: Radixact Synchrony ® , a real-time motion tracking and compensating modality, is used for helical tomotherapy. Control parameters are used for the accurate application of irradiation. Radixact Synchrony ® uses the potential difference, which is an index of the accuracy of the prediction model of target motion and is represented by a statistical prediction of the 3D distance error. Although there are several reports on Radixact Synchrony ® , few have reported the appropriate settings of the potential difference threshold., Purpose: This study aims to determine the optimal threshold of the potential difference of Radixact Synchrony ® during respiratory tumor-motion-tracking irradiation., Methods: The relationship among the dosimetric accuracy, motion tracking accuracy, and control parameter was evaluated using a moving platform, a phantom with a basic respiratory model (the fourth power of a sinusoidal wave), and several irregular respiratory model waveforms. The dosimetric accuracy was evaluated by gamma analysis (3%, 1 mm, 10% dose threshold). The tracking accuracy was measured by the distance error of the difference between the tracked and driven positions of the phantom. The largest potential difference for 95% of treatment time was evaluated, and its correlation with the gamma-pass ratio and distance error was investigated. The optimal threshold of the potential difference was determined by receiver operating characteristic (ROC) analysis., Results: A linear correlation was identified between the potential difference and the gamma-pass ratio (R = -0.704). A linear correlation was also identified between the potential difference and distance error (R = 0.827). However, as the potential difference increased, it tended to underestimate the distance error. The ROC analysis revealed that the appropriate cutoff value of the potential difference was 3.05 mm., Conclusion: The irradiation accuracy with motion tracking by Radixact Synchrony ® could be predicted from the potential difference, and the threshold of the potential difference should be set to ∼3 mm., (© 2023 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, LLC on behalf of The American Association of Physicists in Medicine.)

Published
2023
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49. [Usefulness of an Ultrasound System with Automatic Bladder Urine Volume Measurement Using Artificial Intelligence Technology in Radiotherapy].

Author

Shibata M, Okada W, Sano K, Nakamura K, Sakai Y, Ueda Y, Uemoto K, Takei Y, and Tanooka M

Subjects
Male, Humans, Ultrasonography methods, Tokyo, Urinary Bladder diagnostic imaging, Artificial Intelligence
Abstract

Purpose: We aimed to investigate the usefulness of iViz air ver.4 Convex (FUJIFILM, Tokyo) as a tool to determine the bladder capacity before prostate radiotherapy by comparing it with the existing BladderScan BVI 6100 (Verathon Inc., Bothell, Washington)., Methods: We investigated the usefulness of iViz air as a tool to determine the bladder capacity before prostate radiotherapy by comparing it with the current BladderScan., Results: The absolute value of each error rate was approximately 30.9%±27.2% and 26.4%±18.9% for the BladderScan and iViz air, respectively, with no significant differences between the instruments (p=0.16). Evaluated by urine volume, the mean error rates for bladder volumes >50 ml were 26.9%±19.0% and 26.1%±18.5% for the Bladder Scan and iViz air, respectively, with no significant differences (p=0.56). However, the BladderScan and iViz air had significantly higher error rates of 89.5%±52.5% and 31.5%±25.1%, respectively, if the bladder volume was <50 ml (p=0.005)., Conclusion: The iViz air has limited measurement error to confirm images, especially in limited volumes, suggesting that it is a useful bladder capacity measurement device in performing prostate radiotherapy.

Published
2022
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50. Error Detectability of Isodose Volumes as ROIs in Prostate Intensity-modulated RT QA.

Author

Nakahara R, Fujiwara M, Takaki H, Tanooka M, Ishii K, Kawamorita R, and Yamakado K

Subjects
Humans, Male, Pelvis, Prostate diagnostic imaging, Radiotherapy Dosage, Radiotherapy Planning, Computer-Assisted methods, Prostatic Neoplasms diagnostic imaging, Prostatic Neoplasms radiotherapy, Radiotherapy, Intensity-Modulated methods
Abstract

Background/aim: To evaluate the quality of error detectability with a three-dimensional verification system using isodose volumes as regions of interest (ROIs) in quality assurance (QA) of intensity-modulated radiation therapy., Patients and Methods: Treatment plans with four types of intentional errors were created from the data of 20 patients with localized prostate cancer. These plans underwent QA using the three-dimensional verification system. The datasets of another 30 cases without inserted errors were assessed as controls. The ROIs used in the evaluations were those used in our conventional method (planning target volume, rectum, and bladder). The isodose volume method (5%, 50% and 95% isodose volume) and the error detection rates (measurement above the tolerance values, as set from the other 30 cases) were assessed and compared., Results: There was significantly higher multileaf collimator systematic closed error detectability with the isodose volume method compared to the conventional method (A-side 0.2 mm: p=0.005, A-side 0.35 mm: p=0.002, B-side 0.2 mm: p=0.001 and B-side 0.35 mm: p=0.010). There were no error types for which the error detection rate of the isodose volume method was lower than that of the conventional method., Conclusion: The isodose volume method was able to evaluate the irradiated ROIs that could be delineated, and improved error detectability. This method has the potential to provide a wider margin of safety in intensity-modulated radiation therapy., (Copyright © 2022, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.)

Published
2022
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