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NEMA NU2 performance evaluation of a helmet-type PET prototype with four-layer DOI detectors
https://repo.qst.go.jp/records/75608
https://repo.qst.go.jp/records/756085ded5086-8280-4698-a247-828a0947972d
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2019-04-15 | |||||
| タイトル | ||||||
| タイトル | NEMA NU2 performance evaluation of a helmet-type PET prototype with four-layer DOI detectors | |||||
| 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 |
赤松, 剛
× 赤松, 剛× 田島, 英朗× 吉田, 英治× 岩男, 悠真× 脇坂, 秀克× 前田, 貴雅× 山谷, 泰賀× Akamatsu, Go× Tashima, Hideaki× Yoshida, Eiji× Iwao, Yuma× Wakizaka, Hidekatsu× Maeda, Takamasa× Yamaya, Taiga |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | 【Purpose】Brain PET imaging plays important roles in neurology, neuro-oncology and molecular imaging research. There is a potential demand for a brain PET scanner with high spatial resolution and high sensitivity to achieve more accurate brain imaging. Therefore, we are developing a brain-dedicated helmet-type PET scanner with 4-layer depth-of-interaction (DOI) detectors. In this study, we evaluated performance characteristics of the helmet-type PET prototype. 【Method】The helmet-type PET prototype was composed of 54 detector blocks. The 47 detector blocks were arranged with a hemispherical helmet detector unit and the other 7 detector blocks were located at the neck position. The detector block itself was composed of 4-layer GSOZ crystals. We measured performance characteristics (spatial resolution, sensitivity, scatter fraction, count rate characteristics, accuracy of corrections for count losses and randoms, and image quality) of the helmet-type PET prototype based on the NEMA NU2-2018 standard. In addition to the original NEMA standard, some modified measurements were performed to predict performance of brain imaging. 【Result】The helmet-type PET prototype showed great spatial resolution (1.6 mm at 1 cm offset, OSEM reconstruction), great sensitivity (32.7 kcps/MBq obtained by the modified setup) and promising image quality. With the original 70-cm-long scatter phantom, the scatter fraction, peak noise-equivalent count rate and maximum absolute bias were 37%, 34.9 kcps@4.0kBq/mL and 17.4%. 【Conclusion】We confirmed the high performance of the helmet-type PET prototype. The helmet-type PET scanner has the high potential to achieve more accurate brain PET imaging, even with a small number of detectors. |
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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75回日本放射線技術学会総会学術大会 | |||||
| 発表年月日 | ||||||
| 日付 | 2019-04-11 | |||||
| 日付タイプ | Issued | |||||
