研究者詳細 - 笈田　将皇

MISC - 笈田　将皇

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治療計画装置を用いた動体追跡システムによるX線透視線量の評価

渡辺良晴, 笈田将皇, 鬼丸力也, 青山英史, 藤野賢治, 大坂康博, 藤田勝久, 白土博樹, 宮坂和男

日本放射線腫よう学会誌 16 ( Supplement 1 ) 121 2004年11月

Reduction of set-up errors in head and neck radiotherapy using a real-time tumor tracking system and a mouthpiece with gold-markers

Masataka Oita, Kazuhiko Tsuchiya, Rikiya Onimaru, Keiichi Omori, Yoshiharu Watanabe, Takeshi Nishioka, Hiroki Shirato, Kazuo Miyasaka

Journal of JASTRO 16 ( 3 ) 149 - 155 2004年9月

Purpose: To improve set-up accuracy in head and neck radiotherapy, a real-time tumor tracking radiotherapy (RTRT) system and a mouthpiece with gold markers has been developed. The reduction in set-up error was estimated in this study. Method and Materials: Four patients with oropharyngeal carcinoma were enrolled in this study. Three 2-mm gold markers were implanted into a mouthpiece, which was designed specifically for each patient. The center of gravity of the three markers and its relationship to the tumor was registered using computed tomography (CT) and 3-D treatment planning system. Translational set-up error was calculated by comparing the actual and planned position of the three markers. Set-up errors by conventional manual immobilization and the RTRT system were compared. Results: In manual set-up, median set-up errors along right-left (RL), cranio-caudal (CC), antero-posterior (AP) directions, and three-dimensional (3D) vector length were 0.5, -0.8, 1.3, and 4.1 mm, respectively (n=87). Systematic set-up errors were 2.8, 3.5, 0.6, and 1.9 mm (n=4). Random set-up errors were 2.6, 3.2, 1.7, and 1.9 mm. In RTRT set-up, translational set-up errors were 0.2, 0.3, -0.3, and 1.6 mm, respectively. Systematic set-up errors were 0.8, 0.8, 0.9, and 0.9 mm (n=4). Random set-up errors were 1.2, 1.5, 1.1, and 1.3 mm (n=92). Statistically significant difference (p<0.001) was seen in random set-up errors of x, y, and 3D vector between the two methods. Conclusion: Set-up errors were improved by using RTRT system with a mouthpiece with three gold markers in head and neck radiotherapy (p<0.001). This system will be useful to improve the accuracy of intensity-modulated radiotherapy (IMRT), which requires meticulous set-up.

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Analysis of setup errors in prostate cancer using a real-time tumor tracking system (RTRT SYSTEM)

M Oita, K Kitamura, H Shirato, R Onimaru, F Katsuhisa, H Osaka, H Aoyama, K Miyasaka

The 4th S. Takahashi Memorial International Workshop on 3 Dimensional Conformal Radiotherapy 10 - 12 2004年

Reduction of set-up error and intra-factional motion in head and neck intensity modulated radiotherapy using a real-time tumor tracking system with a gold-marker implanted mouthpiece

M Oita, K Tsuchiya, R Onimaru, K Omori, K Obinata, Y Watanabe, K Fujita, T Furuya, T Nishioka, H Shirato, K Miyasaka

INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS 60 ( 1 ) S597 - S598 2004年

EDR2フィルムを用いたフィルムの線量特性

石坂欣也, 小田まこと, 笈田将皇, 南雲淳也, 藤田勝久, 古家輝夫, 渡辺良晴

北海道放射線技術雑誌 ( 63 ) 55 - 60 2003年7月

記述言語：日本語出版者・発行元：(公社)日本放射線技術学会-北海道部会

線量測定の精度向上を目的としてEDR2フィルムを用いた線量測定に影響を与える様々な誤差要因について検討した.濃度線量変換テーブル作成法,X線エネルギー量,測定深度による誤差を測定したところ,1枚のフィルムに照射する照射野数が多くなると線量に関わらず誤差が大きくなり,照射野数5×5cmとして6照射野以上作成すると測定誤差は5%を超えた.フィルムの線量特性はエネルギーや深さに強い影響を受け,測定誤差は低エネルギーほど大きく,校正深(5cm)では最小であるが,校正深より深くなるに従って大きくなった.EDR2フィルムを用いた線量測定では照射条件,深さ,エネルギー依存性,現像処理,濃度の読み取りなどを行った場合,測定誤差を3%以内に抑制可能であることが示唆された.線量測定,特に絶対線量測定に使用する時にはフィルムの特性を十分に熟知しておく必要があると考えられた

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314 動体追跡装置のQCと線量評価(放射線治療定位・高精度照射)

石坂欣也, 渡辺良晴, 古家輝夫, 藤田勝久, 斎藤英一, 笈田将皇, 熊谷まなみ, 堀田賢治

日本放射線技術学会雑誌 59 ( 9 ) 1098 2003年

52 治療固定具が及ぼす皮膚線量の評価

笈田将皇, 藤田勝久, 渡辺良晴, 小田まこと, 南雲淳也, 古家輝夫

日本放射線技術学会雑誌 57 ( 9 ) 1026 2001年

27 モンテカルロ法によるマンモグラフィの被曝線量評価(2) : オブジェクト指向モンテカルロコード(RADSIM)の構築

笈田将皇, 他名

日本放射線技術学会雑誌 54 ( 6 ) 836 - 837 1998年

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