Faculty Profiles - OITA Masataka

MISC - OITA Masataka

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班報告:温熱療法における効率的な加温技術の構築

高田健太, 高橋昭久, 佐藤英介, 飯森隆志, 笈田将皇, 千田浩一, 磯辺智範

日本放射線技術学会雑誌 70 ( 9 ) 2014

Characerizations of dynamic behavior for organic solar cells under high-energy photons and secondary electrons by 60Co beams

M.Oita, K.Nakata, Y.Sakurai

KURRI Progress Report 2013 231 - 0 2014

班報告:放射線治療場で発生する2次中性子の簡易的評価システムの構築

磯辺智範, 高田健太, 佐藤英介, 半村勝浩, 江川俊幸, 笈田将皇, 千田浩一, 加藤英幸

日本放射線技術学会雑誌 69 ( 9 ) 1012 2013.9

[A comparison of four commercial radiation treatment planning systems for prostate intensity modulated radiation therapy].

Motoharu Sasaki, Hitoshi Ikushima, Yuji Nakaguchi, Tarou Kishi, Masashi Kimura, Ryouta Bandou, Masataka Oita

Nihon Hoshasen Gijutsu Gakkai zasshi 69 ( 7 ) 761 - 72 2013.7

Language：Japanese

At present, every manufacturer of intensity modulated radiation therapy (IMRT) equipment uses multi-leaf collimators (MLCs); however, each company's intensity modulation methods and dose calculation algorithms differ. This study used four typical radiation treatment planning systems (RTPSs) employed domestically for prostate IMRT plans to carry out 15 case studies by one planner based on the dose limits at this clinic. The results were used to compare the differences, if any, in RTPS treatment plans. With prostate IMRT plans, an overlap area exists between the PTV and the rectum. For this reason, while observing dose limits of 60-75 Gy (within the dose tolerated by the rectum), securing uniformity and concentration of dose is essential to create the most appropriate treatment plan for the PTV and other targets. Although each RTPS uses different planning methods, it was generally possible to observe this clinic's dose limits by adjusting the parameter values. When identical beam data is used, it is possible to create similar treatment plans.

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IMRT最適化パラメータの基礎的検討～Minimum Segment Size, Step Incrementの影響について～

福田一茂, 笈田将皇, 青山英樹, 大塚裕太, 井俣真一郎, 杉原誠治, 藤井俊輔, 宇野弘文, 香川芳徳, 田原誠司, 稲村圭司

広島県放射線治療技術研究会会誌 ( 2013 ) 26 - 34 2013

Development of MRI phantom equivalent to human tissues for 3.0-T MRI International journal

Kengo Hattori, Yusuke Ikemoto, Wataru Takao, Seiichiro Ohno, Takashi Harimoto, Susumu Kanazawa, Masataka Oita, Koichi Shibuya, Masahiro Kuroda, Hirokazu Kato

Medical Physics 40 ( 3 ) 032303 - 032303 2013

Language：English Publisher：John Wiley and Sons Ltd

Purpose: A 3.0-T MRI phantom (called the CAGN-3.0T phantom) having human-equivalent relaxation times and human-equivalent conductivity was developed. Methods: The ingredients of the phantom are carrageenan (as a gelatinizer), agarose (as a T2-relaxation modifier), GdCl3 (as a T1-relaxation modifier), NaCl (as a conductivity modifier), and NaN3 (as an antiseptic). Numerous samples with varying concentrations of agarose, GdCl3, and NaCl were prepared, and T 1 and T2 values were measured using 3.0-T MRI. Results: The T1 values of the CAGN-3.0T phantom were unaffected by NaCl, while the T2 values were only slightly affected. Based on the measured data, empirical formulae were devised to express the relationships between the concentrations of agarose, GdCl3, and NaCl and the relaxation times. The formula for expressing the conductivity of the CAGN-3.0T phantom was obtained. Conclusions: By adjustments to the concentrations of agarose, GdCl3, and NaCl, the relaxation times and conductivity of almost all types of human tissues can be simulated by CAGN-3.0T phantoms. The phantoms have T1 values of 395-2601 ms, T2 values of 29-334 ms, and conductivity of 0.27-1.26 S/m when concentrations of agarose, GdCl3, and NaCl are varied from 0 to 2.0 w/w%, 0 to 180 μmol/kg, and 0 to 0.7 w/w%, respectively. The CAGN-3.0T phantom has sufficient strength to replicate the torso without using reinforcing agents, and can be cut with a knife into any shape. © 2013 American Association of Physicists in Medicine.

DOI： 10.1118/1.4790023

A Comparison of Four Commercial Radiation Treatment Planning Systems for Prostate Intensity Modulated Radiation Therapy

Sasaki Motoharu, Ikushima Hitoshi, Nakaguchi Yuji, Kishi Tarou, Kimura Masashi, Bandou Ryouta, Oita Masataka

Japanese Journal of Radiological Technology 69 ( 7 ) 761 - 777 2013

Language：Japanese Publisher：Japanese Society of Radiological Technology

At present, every manufacturer of intensity modulated radiation therapy (IMRT) equipment uses multi-leaf collimators (MLCs); however, each company’s intensity modulation methods and dose calculation algorithms differ. This study used four typical radiation treatment planning systems (RTPSs) employed domestically for prostate IMRT plans to carry out 15 case studies by one planner based on the dose limits at this clinic. The results were used to compare the differences, if any, in RTPS treatment plans. With prostate IMRT plans, an overlap area exists between the PTV and the rectum. For this reason, while observing dose limits of 60–75 Gy (within the dose tolerated by the rectum), securing uniformity and concentration of dose is essential to create the most appropriate treatment plan for the PTV and other targets. Although each RTPS uses different planning methods, it was generally possible to observe this clinic’s dose limits by adjusting the parameter values. When identical beam data is used, it is possible to create similar treatment plans.

DOI： 10.6009/jjrt.2013_JSRT_69.7.761

Other Link： https://search.jamas.or.jp/link/ui/2013320922

Analysis of post-irradiation growth effect for development of dose verification technique using a radiochromic film

T Tsunehiro, M Oita, H Aoyama, T Kamomae

Igaku Butsuri 33 ( S1 ) 11 - 14 2013

岡山県における放射線治療施設の実態調査～人的資源，品質管理に関する検討～

中野聡, 笈田将皇, 青山英樹, 宇野弘文, 山田誠一, 長瀬尚巳, 平松太志, 十川達章, 横山誠一, 綱沢勝之, 森脇秀一, 中津綾子

広島県放射線治療技術研究会会誌 ( 2013 ) 57 - 65 2013

不均質部の線量計算精度に関する基礎的検討

香川美紗都, 笈田将皇, 木村洋司, 横山誠一

広島県放射線治療技術研究会会誌 ( 2013 ) 47 - 56 2013

Clinical Evaluation of Automatic Contours for Head and Neck Region Using Deformable Image Registration Software

SASAKI Motoharu, TOMINAGA Masahide, KAMOMAE Takeshi, IKUSHIMA Hitoshi, KISHI Taro, KAWASHITA Tetsuya, TADA Akihisa, SHIGEMITSU Midori, OITA Masataka

Jpn. J. Radiol. Technol. 69 ( 11 ) 1250 - 1260 2013

Language：Japanese Publisher：Japanese Society of Radiological Technology

The purpose of this study was to clinically evaluate the automatic outline extraction properties using general-purpose deformable image registration (DIR) software for the head and neck region. To this end, we evaluated the following: (1) the difference between manual outline extraction carried out by a radiation therapy specialist and automatic outline extraction using the DIR software, and (2) the precision of the automatic outline extraction for the diachronic figure change and change in the organ shape. The manually-extracted outline and that extracted using the DIR software closely resembled each other at 0.70. Further, in the same case, the automatic outline extraction precision of the DIR software was greater at about 0.80. Our findings suggest DIR software to be useful for lessening the work involved in outline extraction.

DOI： 10.6009/jjrt.2013_JSRT_69.11.1250

CiNii Article

CiNii Books

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Other Link： https://jlc.jst.go.jp/DN/JALC/10025901763?from=CiNii

電離箱線量計の吸収線量変換係数について

S Tsuji, N Narihiro, M.Oita

Proceedings of the 21th EGS Users' Meeting in Japan ( 2013 ) 5 - 5 2013

Charaterizations of Dynamic Behavior for Organic Solar Cells under High-Energry Secondary Electrons by 60Co Beams

M.Oita, K Nakata, K. Sakurai

京都大学原子炉実験所英文共同利用報告書（Progress Report) 1 - 1 2013

Long term analysis of comprehensive daily MLC QA for DMLC-IMRT

M Yamada, M Oita, K Kai, Y Hayashi, K Matsuda, A Kawaguchi, S Kuroda

Proceeding of 13th Asia-Oceania Congress of Medical Physics & 11th South-East Asian Congress of Medical Physics 55 - 55 2013

Charaterizations of Dynamic Behavior for Organic Solar Cells under High-Energry Secondary Electrons by 60Co Beams

M Oita, K Nakata, Y Sakurai

Proceeding of 13th Asia-Oceania Congress of Medical Physics & 11th South-East Asian Congress of Medical Physics 54 - 55 2013

IMRT最適化パラメータの基礎的検討～DVHへの影響について～

早川光, 笈田将皇, 青山英樹, 大塚裕太, 井俣真一郎, 杉原誠治, 藤井俊輔, 宇野弘文, 香川芳徳, 田原誠司, 稲村圭司

広島県放射線治療技術研究会会誌 ( 2013 ) 35 - 46 2013

Evaluation of Sensitivity and Uniformity of New Radiochromic Film with Two Commercial Scanners

T. Kamomae, Y. Miyabe, A. Sawada, M. Oita, T. Fujimoto, S. Yano, M. Nakata, S. Nakayama, M. Hiraoka

MEDICAL PHYSICS 39 ( 6 ) 3727 - 3727 2012.6

当院における強度変調放射線治療(Intensity Modulated Radiation Therapy:IMRT)臨床開始前基礎データの検討

山田正雄, 甲斐功一, 小川邦夫, 松田和久, 岩崎一人, 笈田将皇, 黒田覚

島根県立中央病院医学雑誌 36 3 - 6 2012

IMRT最適化パラメータの基礎的検討～DVHへの影響について～

早川光, 笈田将皇

平成23年度岡山大学医学部保健学科卒業論文集 1 - 12 2012

IMRT最適化パラメータの基礎的検討～Minimum Segment Size, Step Incrementの影響について～

福田一茂, 笈田将皇

平成23年度岡山大学医学部保健学科卒業論文集 1 - 9 2012

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