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Whole Gamma Imaging: demonstration of the β＋-γ coincidence
https://repo.qst.go.jp/records/75716
https://repo.qst.go.jp/records/75716a9b384bc-b6b8-47f0-95e4-2ac73cb265cc
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-04-25 | |||||
| タイトル | ||||||
| タイトル | Whole Gamma Imaging: demonstration of the β＋-γ coincidence | |||||
| 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 |
田島, 英朗
× 田島, 英朗× 吉田, 英治× 奥村, 勇介× 菅, 幹生× 河地, 有木× Kamada, Kei× Parodi, Katia× 山谷, 泰賀× Hideaki, Tashima× Eiji, Yoshida× Yusuke, Okumura× Mikio, Suga× Naoki, Kawachi× Taiga, Yamaya |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | [Purpose] We have proposed a new concept of whole gamma imaging (WGI), which is a novel combination of PET and Compton imaging, and we have showed by simulation the feasibility of triple-gamma imaging targeting β+-γ emitters, which emit both a positron and a gamma ray almost at the same time. In this study, we developed a proof-of-concept prototype of the WGI and an imaging method for the triple-gamma imaging incorporating resolution modeling. [Method] We developed a WGI prototype by inserting a scatterer detector ring (20 cm in inner diameter, 20x2 (transverse x axial) detectors each consisted of a 24x24x1 array of 0.9x0.9x6-mm3 GAGG crystals and a 8x8 array of 3-mm multipixel photon counters (MPPCs)) into a PET (absorber) detector ring (66 cm in inner diameter, 40x4 detectors each consisted of a 16x16x4 array of 2.8x2.8x7.5-mm3 Zr-doped GSO crystals and 64-ch photo multiplier tubes). In the triple-gamma imaging, radioactivity source position can be determined as the intersection point between a line-of-response (positron) and a Compton cone (gamma ray) in the field of view. The half-cone angle of the Compton cone is equal to the scatter angle determined by the Klein-Nishina equation using energy information. We derived an equation necessary to determine the intersection point and developed a method to model blurring effect of the cone due to the energy resolution of the detectors. To demonstrate the effectiveness of the triple-gamma imaging, we measured a 22Na point source, which emits a positron and a 1274 keV gamma ray, placed at various positions by using the WGI prototype. [Results] We compared triple-gamma images generated by back-projection using the proposed model and using only LOR information for the same list-mode data set. The proposed method could generate clearer image. [Conclusion] We demonstrated that the triple-gamma imaging is possible with the WGI prototype and the proposed method. |
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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 | 第117回日本医学物理学会学術大会 | |||||
| 発表年月日 | ||||||
| 日付 | 2019-04-11 | |||||
| 日付タイプ | Issued | |||||
