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Normalization for brain-dedicated PET with the hemispherical detector arrangement
https://repo.qst.go.jp/records/73044
https://repo.qst.go.jp/records/73044d650db2e-342a-450f-8129-ad834fef191b
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-11-21 | |||||
| タイトル | ||||||
| タイトル | Normalization for brain-dedicated PET with the hemispherical detector arrangement | |||||
| 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 |
田島, 英朗
× 田島, 英朗× 赤松, 剛× 岩男, 悠真× 脇坂, 秀克× 吉田, 英治× 山下, 大地× 山谷, 泰賀× Tashima, Hideaki× Akamatsu, Go× Iwao, Yuma× Wakizaka, Hidekatsu× Yoshida, Eiji× Yamashita, Taichi× Yamaya, Taiga |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | We are developing a brain-dedicated PET system, which has a spherically arranged detector unit and an add-on detector unit at the back side of the neck for improving sensitivity. To achieve quantitative images without imaging artifacts, normalization of detector sensitivity is essential for PET imaging. For normalization, every line of response having a cross section within the field of view (FOV) or imaging region should also have a cross section within the radioactivity distribution of a normalization phantom. Because our PET prototype has the spherical detector arrangement, rotating line sources typically used for cylindrical PET cannot be used. In our previous work, we used a double-cylinder shaped pool phantom fit into the hemispherical detector arrangement. However, the pool phantom filled with solution attenuates emitted gamma-rays significantly, and the measured data contains a lot of scattered events. In this study, therefore, we propose a new normalization phantom, a hollow-dome phantom, having radioactivity and attenuation distributions only at the surrounding region of the FOV. We measured the hollow-dome and the double-cylinder pool phantoms each filled with 18F solution of 15 MBq for 9 hours by the first helmet-neck PET prototype. Also, we conducted a Monte Carlo simulation to estimate scatter fraction. As a result, he hollow-dome phantom provided 3 times higher count rate with the random fraction of 23%. The scatter fraction was 5% for the hollow-dome phantom and 31% for the double-cylinder phantom. Therefore, the true count rate for the hollow-dome phantom was estimated 5 times higher. In addition, imaging test showed that the hollow-dome phantom could reduce noise for the same radioactivity and measurement time. | |||||
| 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 | IEEE NSS MIC RTSD | |||||
| 発表年月日 | ||||||
| 日付 | 2018-11-15 | |||||
| 日付タイプ | Issued | |||||
