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シンチレーティングGlass GEMを用いた炭素線の線量分布測定に関する研究（3）
https://repo.qst.go.jp/records/75704
https://repo.qst.go.jp/records/7570426dce9f3-cd66-4080-94d5-a58a8be079ed
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-04-24 | |||||
| タイトル | ||||||
| タイトル | シンチレーティングGlass GEMを用いた炭素線の線量分布測定に関する研究（3） | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 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 |
Koba, Yusuke
× Koba, Yusuke× Fujiwara, Takeshi× Mitsuya, Yuki× Matsufuji, Naruhiro× Maehata, Kyosuke× Koba, Yusuke× Matsufuji, Naruhiro |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | [Purpose] In the dose distribution measurement for QA / QC in high-precision radiation therapy such as particle therapy, high accuracy and high spatial resolution is required. This research group has been developing a detector for high-spatial resolution two-dimensional dose distribution measurement using glass GEM (Gas Electron Multiplier) and scintillation gas. Based on the measurement results so far, it is known that this detector has small LET dependence, and it is expected to be applied to dose distribution measurement of particle therapy. In this study, a test QA plan for heavy particle radiation therapy was prepared and two-dimensional distribution measurement using this detector was carried out. [Methods] In this detector, the ionization distribution in the scintillation gas is electronically amplified by a glass GEM. Then, the distribution of the generated light is captured from the back side of the ITO (Tin-doped Indium Oxide) transparent electrode of the Anode portion by using a cooled CCD camera. Irradiation experiments were carried out using 290 MeV/u carbon ion beam at NIRS-HIMAC. A geometric dose distribution was formed using a bolus collimator, and the dose distribution of the treatment planning device was compared with the light quantity distribution measured by this detector. [Results] The light quantity distribution obtained by this detector corresponded to the dose distribution of the treatment plan relatively, but the accuracy of the low dose area was reduced. And, it was found that it is necessary to investigate the stability, such as discharge occurred in the high dose area when the gain was increased. It is considered that optimization such as explication of the cause of deterioration in accuracy of the low dose region and adjustment of the GEM gain is necessary. [Conclusion] Although the light quantity distribution corresponding to the dose distribution of carbon beam was obtained from this detector, in order to use it for QA etc., improvement in accuracy and stability is necessary. | |||||
| 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 | 第117回日本医学物理学会学術大会 | |||||
| 発表年月日 | ||||||
| 日付 | 2019-04-14 | |||||
| 日付タイプ | Issued | |||||
