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Improved spatial resolution of the X'tal cube: a 3D crystal array covered with MPPCs
https://repo.qst.go.jp/records/70224
https://repo.qst.go.jp/records/7022479dc777c-ea12-484d-870e-8f96f7aab6b8
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2010-09-13 | |||||
| タイトル | ||||||
| タイトル | Improved spatial resolution of the X'tal cube: a 3D crystal array covered with MPPCs | |||||
| 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 |
Inadama, Naoko
× Inadama, Naoko× et.al× 稲玉 直子 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | The "crystal (X'tal) cube" is our new PET detector, which is composed of a segmented scintillation crystal block covered with Multi-Pixel Photon Counters (MPPCs). For a proof-of-concept, in the last year, we developed the first prototype detector having 3 mm isotropic resolution with 3 mm x 3 mm aperture MPPCs. In this paper, we succeeded to obtain 2 mm isotropic detector resolution (i.e., each crystal whose volume was reduced to 8/27 was identified) with the same MPPCs. In PET, it is important to get information of radiation detected location in PET detectors 3-dimensionaly to achieve both high spatial resolution and high sensitivity. A photomultiplier tube (PMT) which generally used as a photo-detector of a PET detector provides the 2-dimensional information and additional idea is always required to obtain depth of interaction (DOI) information. Fig. 1a) shows a typical structure of X'tal cube in which MPPCs are used instead of PMTs.. Unlike a PMT, a MPPC is small enough and will not interfere in radiation detection even if it is set on the path of the radiation. In X'tal cube, MPPCs are then set on the all six surfaces of the segmented crystal block and detect scintillation photons in 3-dimension. Since always some MPPCs are placed near originated position of scintillation photons, the photons can be detected before attenuation and sufficient amount of detected photons creates clear responses, which allow fine segmentation of the crystal block for high spatial resolution. In this study, we made the X'tal cube composed of a cubic crystal block 18.0 mm on a side and 96 MPPCs (Hamamatsu Photonics K.K., Japan, sensitive area: 3 mm x 3 mm, micro cell: 50 micrometer), 16 MPPCs on each surface of the crystal block. The crystal block consists of a 9 x 9 x 9 array of cubic Lu2xGd2(1-x)SiO5 (LGSO, x = 0.9) crystals 2 mm on a side. Fig.1b) shows the results of crystal identification performance. Each peak is crystal response. All responses were discriminated sufficiently and that means the X'tal cube achieved 2 mm isotropic spatial resolution. |
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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 | 2010 World Molecular Imaging Congress | |||||
| 発表年月日 | ||||||
| 日付 | 2010-09-11 | |||||
| 日付タイプ | Issued | |||||
