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Tracking the same fast-LGSO crystals by changing surface treatments for better coincidence timing resolution in PET
https://repo.qst.go.jp/records/2000425
https://repo.qst.go.jp/records/20004252d59914b-a420-424b-8193-675f7646e34a
| アイテムタイプ | 学術雑誌論文 / Journal Article(1) | |||||||||||
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| 公開日 | 2024-05-02 | |||||||||||
| タイトル | ||||||||||||
| タイトル | Tracking the same fast-LGSO crystals by changing surface treatments for better coincidence timing resolution in PET | |||||||||||
| 言語 | en | |||||||||||
| 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_6501 | |||||||||||
| 資源タイプ | journal article | |||||||||||
| 著者 |
Kiyokawa Miho
× Kiyokawa Miho
× Hangyu Kang
× Yamaya Taiga
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| 抄録 | ||||||||||||
| 内容記述タイプ | Abstract | |||||||||||
| 内容記述 | Achieving fast coincidence timing resolution (CTR) is an important issue in clinical time-of-flight positron emission tomography (TOF-PET) to improve the reconstructed image quality. One of themajor factors affecting theCTRis the crystal surface treatment,which is often parameterized as surface roughness. However, previous studies on the crystal surface treatment optimization had twolimitations of crystal-bycrystal variation andworseCTRover 200 ps.Here, we report the effects of the crystal surface treatment on the performance of a 20mmlong fast-LGSOcrystal basedTOFdetector by tracking the same crystals in the sub-180 psCTRregime.The light collection efficiency (LCE), energy resolution (ER) andCTRof theTOF detector were evaluatedwith six different crystal surface treatments of chemically polished (C.P),C.Phalf side roughened (1/2S) treatment, and then theC.P one side roughened (1S) treatment, mechanically polished (M.P) treatment,M.P 1/2S treatment, andM.P 1S treatment. The four lateral surfaces of each crystalwerewrapped by using enhanced specular reflector film while the top surface was covered by using Teflon tape.The bottom surface of the crystal was optically coupled to a silicon photomultiplier.The timing and energy signals were extracted by using a custom-made high-frequency readout circuit, and then digitized by using awaveform digitizer.All the experimental conditionswere sameexcept thecrystal surface treatment.Amongthe six different crystal surface treatments, theM.P 1S would be the optimal crystal surface treatment which balanced enhancements in theCTR(165±3ps) and ER(10.5±0.5%).Unlike the M.P 1S, theC.P 1S did not enhance theCTRand ER.Hence, theC.P without rougheningwould be the second-best optimal crystal surface treatmentwhich balanced theCTR(169±3ps) and ER(10.5±0.5%). |
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| 書誌情報 |
Biomedical Physics & Engineering Express 巻 9, 号 2, p. 025005, 発行日 2023-02 |
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| 出版者 | IOP Publishing | |||||||||||
| ISSN | ||||||||||||
| 収録物識別子タイプ | ISSN | |||||||||||
| 収録物識別子 | 2057-1976 | |||||||||||
| DOI | ||||||||||||
| 識別子タイプ | DOI | |||||||||||
| 関連識別子 | 10.1088/2057-1976/acb552 | |||||||||||
