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Optimization of the in-Beam OpenPET Detector for Carbon Beam Irradiation
https://repo.qst.go.jp/records/70987
https://repo.qst.go.jp/records/70987d429df6a-aa9a-4284-b712-398b255318e8
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2012-11-19 | |||||
| タイトル | ||||||
| タイトル | Optimization of the in-Beam OpenPET Detector for Carbon Beam Irradiation | |||||
| 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 |
Nishikido, Fumihiko
× Nishikido, Fumihiko× Hirano, Yoshiyuki× Inadama, Naoko× Yoshida, Eiji× Tashima, Hideaki× Satou, Shinji× Inaniwa, Taku× Murayama, Hideo× Ito, Hiroshi× Yamaya, Taiga× 錦戸 文彦× 平野 祥之× 稲玉 直子× 吉田 英治× 田島 英朗× 佐藤 眞二× 稲庭 拓× 村山 秀雄× 伊藤 浩× 山谷 泰賀 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We are developing the OpenPET which is well suited to in-beam PET in carbon ion therapy thanks to the open space. The in-beam PET can image the distribution of positron emitters during beam irradiation for in-situ dose monitoring. Therefore careful designing and testing of OpenPET detectors are important because secondary particles generated in a target degrade detector performance in the OpenPET geometry and the quantity of positron emitters produced in in-beam PET is very small. In this paper, we optimized the final design of the in-beam OpenPET detector. Some detector components were changed from our previous work for use under practical situations. We carried out in-beam tests of this new detector for carbon beam irradiation with practical intensities. The constructed OpenPET detector consists consisted of a 16x16x4 crystal array with four-layer DOI encoding capability and a PS-PMT. The scintillator material was changed from LGSO that included radio isotopes to GSOZ. In order to compensate for the lower light yield of GSOZ, we applied the PS-PMT (R10552-100-M64) with the super bialkali photocathode which realizes 30% higher quantum efficiency than the conventional bialkali type. A large current divider circuit was applied since the PMT current exceeded the dynamic range of a normal divider circuit under the targeted practical situations. Irradiation tests were done in HIMAC. The energy and intensities of the C-12 beam were 290MeV/u and 10^8 -10^9 particles per second (pps), respectively. The detector was positioned 30cm from the backside of the water phantom at an angle of 30deg. We obtained sufficient crystal identification performance around 10^8 pps, although the position histogram was degrading slightly with increasing C-12 beam intensity. The average energy resolution of 14.9% was obtained for 511keV gamma rays. We concluded that the constructed detector was able to function as the OpenPET detector for in-beam imaging. | |||||
| 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 | 2012IEEE NSS&MIC | |||||
| 発表年月日 | ||||||
| 日付 | 2012-11-03 | |||||
| 日付タイプ | Issued | |||||
