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Influence on crystal identification performance of the 4-layer DOI PET detector by misalignment position of the DOI block
https://repo.qst.go.jp/records/54446
https://repo.qst.go.jp/records/54446233ef161-ea3d-4526-976d-276a996231cf
| Item type | 会議発表論文 / Conference Paper(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2014-01-27 | |||||
| タイトル | ||||||
| タイトル | Influence on crystal identification performance of the 4-layer DOI PET detector by misalignment position of the DOI block | |||||
| 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_5794 | |||||
| 資源タイプ | conference paper | |||||
| 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 |
新田, 宗孝
× 新田, 宗孝× 河合, 秀幸× 稲玉, 直子× 錦戸, 文彦× 平野, 祥之× 吉田, 英治× 田島, 英朗× 伊藤, 浩× 山谷, 泰賀× 新田 宗孝× 河合 秀幸× 稲玉 直子× 錦戸 文彦× 平野 祥之× 吉田 英治× 田島 英朗× 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 | The scintillation crystal block for a positron emission tomography (PET) detector is generally composed of a two-dimensional (2D) array of small crystal elements. The detector identifies the scintillating crystal element by Anger type calculation with signals of photomultiplier tubes (PMT) coupled to the crystal block. The results of the calculation are drawn as clusters in a 2D position histogram, each cluster corresponds to an individual crystal element in the crystal block. The PET detector we developed contains a crystal block composed of four layers of the 2D crystal element arrays so that it has the capability of providing not only 2D interacting position information but also 4-layer depth-of-interaction (DOI) information for radiation(1). The 3D position information solves the parallax error problem caused in PET systems when we try to achieve high sensitivity while keeping high spatial resolution. Fig. 1(a) shows the principle of the 4-layer DOI detector. We use a multi-anode PMT (MA-PMT) to obtain light output of the crystal arrays. We control the scintillation light distribution on the MA-PMT by appropriately removing reflectors between the crystal elements, and then can represent the corresponding clusters of all crystal elements in the 3D array in a 2D position histogram without overlapping. Because the 4-layer DOI detector draws four times the number of clusters as a non-DOI detector on the 2D position histogram (Fig. 1(b)), a slight misalignment of the crystal block position on the MA-PMT could cause overlap of the clusters and significantly degrade crystal element identification performance at the outer-side area. Furthermore, when the crystal elements are small, the interval of the adjacent clusters depends on the relative position of the corresponding crystal elements to the MA-PMT anodes. The dependence could cause further degradation of the crystal identification. In this study, we investigated how the position of the crystal elements influences the cluster distribution in the 2D position histogram. We also checked degradation of cluster discrimination at the outer-side area which would be caused by misalignment of the 4-layer DOI crystal block. |
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| 書誌情報 |
RADIATION DETECTORS AND THEIR USES p. 1-11, 発行日 2014-01 |
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