WEKO3
アイテム
Effect of asymmetric lateral beam spread of a pencil beam and oscillation of spot position on fluence distribution for particle pencil beam scanning
https://repo.qst.go.jp/records/71657
https://repo.qst.go.jp/records/71657c335778a-b4bf-4832-a353-e7cfa33d803d
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2015-05-26 | |||||
| タイトル | ||||||
| タイトル | Effect of asymmetric lateral beam spread of a pencil beam and oscillation of spot position on fluence distribution for particle pencil beam scanning | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
Tansho, Ryohei
× Tansho, Ryohei× Furukawa, Takuji× Hara, Yousuke× Mizushima, Kota× Saotome, Naoya× Saraya, Yuichi× 丹正 亮平× 古川 卓司× 原 洋介× 水島 康太× 早乙女 直也× 皿谷 有一 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | A pencil beam scanning system for carbon ion radiotherapy has operated at National Institute of Radiological Sciences (NIRS) in Japan since 2011. The pencil beam scanning system makes conformal dose distribution to a target by superposition of a pencil beam. Then it is required to accurately irradiate the pencil beam with 2-dimensional Gaussian distribution with symmetric variance in the lateral direction to a planned spot position. However, the actual lateral beam spread of the pencil beam is slightly different and the actual beam irradiation position is also slightly different from the planned spot position. The different lateral beam spread and the different beam irradiation position are suppressed to the acceptance level in the beam commissioning process to remain the uniformity of dose distribution. However, the range of the acceptance level has been unclear and determined experimentally. The purpose of this study is to objectively determine the acceptance level about the symmetry of the lateral beam spread of the pencil beam and the accuracy of the beam irradiation position. We calculated a fluence distribution by superposing the individual pencil beam with asymmetric variances in the lateral direction and/or with oscillation of the beam irradiation position. We changed the difference of the lateral beam spread and the amplitude of the oscillation and studied the effect of these variations on the fluence distribution. We present the calculation results and summarize the acceptance level about the symmetry of the pencil beam spread and the accuracy of the beam irradiation position. |
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| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 54th Annual Conference of the Particle Therapy Co-Operative Group (PTCOG54) | |||||
| 発表年月日 | ||||||
| 日付 | 2015-05-20 | |||||
| 日付タイプ | Issued | |||||
