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Optimization of the surface area of the laser-induced layer for DOI detectors with high spatial resolution
https://repo.qst.go.jp/records/81564
https://repo.qst.go.jp/records/81564916057b1-d6e2-45f7-ac1c-f89d7564c776
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-10-29 | |||||
| タイトル | ||||||
| タイトル | Optimization of the surface area of the laser-induced layer for DOI detectors with high spatial resolution | |||||
| 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 |
Mohammadi, Akram
× Mohammadi, Akram× Nishikido, Fumihiko× Yoshida, Eiji× Yamaya, Taiga× Mohammadi, Akram× Nishikido, Fumihiko× Yoshida, Eiji× Yamaya, Taiga |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | It is possible to improve sensitivity and resolution of positron emission tomography (PET) systems using depth-of-interaction (DOI) information. We recently developed a series of dual-ended detectors with three DOI resolutions of 3 mm, 1.5 mm and 1mm using crystal bars segmented by applying the subsurface laser engraving (SSLE) technique to 7, 13 and 20 DOI segments. It is crucial to achieve the submillimeter level spatial resolution for our detector as the narrow crystal bars have high fragility after applying SSLE technique. In this work, we focused on optimization of the surface area of the SSLE-induced layer to the narrow crystal bars in order to resolve the issue of fragility while keeping high detector performance. The SSLE layers were induced to the middle cross section of each crystal bar of 1.5×1.5×20 mm3 with a distance of 0.1, 0.2, 0.3, 0.4 or 0.5 mm from two opposite edges of the crystal bar. All crystals were segmented into 4 DOI segments and the performance of five sets of dual-ended DOI detectors consisting of 2×2 crystal arrays were investigated. We evaluated the performances of the detectors from the viewpoint of the best crystal segment identification and energy resolution. The optimized surface area of the SSLE layers was decided based on detector performance. The 3D position maps of the detectors were obtained by the Anger type calculation and the crystal identification performance was evaluated for the crystal arrays. Clear separation of the segments with the distance-to-width-ratio (DWR) larger than 7 was obtained for crystal arrays in which the distance of the SSLE-induced layer from two opposite edges of the crystal were 0.1, 0.2 and 0.3 mm. DWR for the other two crystal arrays was less than 2.9. The energy resolutions were also evaluated for all detectors. The energy resolutions of 7.9 ± 0.6%, 7.6 ± 0.5% and 7.1 ± 0.7% were obtained for the detectors in which the SSLE layers were induced with 0.1, 0.3 and 0.5 mm distances, respectively, from two opposite edges of the crystals. There was a compromise between energy resolution and crystal segment identification and the optimum performance was obtained for the detector in which the SSLE-induced layers were 0.3 mm from two opposite edges of the crystals. | |||||
| 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 | 2020 Virtual IEEE Nuclear Science Symposium (NSS) and Medical Imaging Conference (MIC) | |||||
| 発表年月日 | ||||||
| 日付 | 2020-11-04 | |||||
| 日付タイプ | Issued | |||||
