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  1. 0 資料タイプ別
  2. 03 紀要論文
  1. 090 医学部保健学科
  2. 20 紀要
  3. 01 新潟大学保健学雑誌
  4. 第15巻第1号

照射位置の偶然誤差による線量分布の変化に対して照射野の形状が及ぼす影響

http://hdl.handle.net/10191/49819
http://hdl.handle.net/10191/49819
ce20a2c5-8f38-442b-b2fa-fdbd67355cd4
名前 / ファイル ライセンス アクション
15(1)_57-65.pdf 15(1)_57-65.pdf (2.2 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2018-04-05
タイトル
タイトル 照射位置の偶然誤差による線量分布の変化に対して照射野の形状が及ぼす影響
タイトル
言語 en
タイトル 照射位置の偶然誤差による線量分布の変化に対して照射野の形状が及ぼす影響
言語
言語 jpn
キーワード
主題Scheme Other
主題 放射線治療
キーワード
主題Scheme Other
主題 照射野形状
キーワード
主題Scheme Other
主題 PTVマージン
キーワード
主題Scheme Other
主題 偶然誤差
キーワード
主題Scheme Other
主題 線量分布
キーワード
主題Scheme Other
主題 radiotherapy
キーワード
主題Scheme Other
主題 irradiation field shape
キーワード
主題Scheme Other
主題 PTV margin
キーワード
主題Scheme Other
主題 random geometrical uncertainty
キーワード
主題Scheme Other
主題 dose distribution
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
その他のタイトル
その他のタイトル The impact of irradiation field shape on isodose line deviation due to random geometrical uncertainties in radiotherapy
著者 笹本, 龍太

× 笹本, 龍太

WEKO 164155

笹本, 龍太

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著者別名
識別子 164156
識別子Scheme WEKO
姓名 Sasamoto, Ryuta
抄録
内容記述タイプ Abstract
内容記述 放射線治療計画における計画標的体積(PTV)は,照射位置のばらつきによる等線量曲線の偏位を補償するための余白(PTVマージン)を,腫瘍細胞の存在範囲に加えることで作成する.今回,必要なPTVマージンの値に照射野の形状が及ぼす影響を検討することを目的に,van Herkの理論値(正確法,近似法)の妥当性を検討した.部分的に凸形~凹形を有する7種類の照射野を作成し,照射方向は対向2門,4 MV X線と10 MV X線でそれぞれ線量分布を計算した.線量分布にばらつきを加える数値シミュレーションを行い,等線量曲線(処方線量の95%)の偏位を理論値と比較した.正確法は照射野辺縁が平坦な場合はシミュレーションと一致したが,照射野の凹凸が大きくなると不一致が見られた.近似法は多くの場合不一致が見られたが,不一致の範囲は正確法より小さかった.PTVマージンの算出に際しては,照射野形状の考慮が必要である.
抄録
内容記述タイプ Abstract
内容記述 The planning target volume (PTV) on the radiotherapy plan is created by adding a margin (PTV margin) to the volume in which tumor cells spread, for compensating the deviation of the isodose curve due to geometrical uncertainties. In this study, the validity of van Herk's theoretical value (precise method, approximation method) was evaluated for the purpose of examining the impact of the irradiation field shape on necessary PTV margin value. Seven types of irradiation fields with partially convex to concave shapes were prepared, and the dose distributions were calculated with the parallel opposed fields, using 4 MV X-ray and 10 MV X-ray data. Numerical simulation was carried out to add geometrical uncertainties to the dose distribution, and the deviation of the isodose line (95% of the prescribed dose) was compared with the theoretical value. The precise method was consistent with the simulation when the edge of the irradiated field was flat, but inconsistency was observed when the irregularities of the irradiation field was increased. Although the approximation method was found to be inconsistent in many cases, the range of inconsistency was smaller than that of the precise method. When calculating the PTV margin, the influence of the irradiation field shape should be taken into account.
書誌情報 新潟大学保健学雑誌
en : 新潟大学保健学雑誌

巻 15, 号 1, p. 57-65, 発行日 2018-03
出版者
出版者 新潟大学医学部保健学科
ISSN
収録物識別子タイプ ISSN
収録物識別子 21884617
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA12680484
著者版フラグ
値 publisher
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