WEKO3
アイテム
First prototype of a novel dual round-edge detector arrangement for breast PET imaging
https://repo.qst.go.jp/records/83033
https://repo.qst.go.jp/records/830336c809e58-f899-4857-bdfd-957ef15117ac
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2021-06-25 | |||||
| タイトル | ||||||
| タイトル | First prototype of a novel dual round-edge detector arrangement for breast PET imaging | |||||
| 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 |
Go, Akamatsu
× Go, Akamatsu× Eiji, Yoshida× Hideaki, Tashima× Shigeki, Ito× Miwako, Takahashi× Taiga, Yamaya× Go, Akamatsu× Eiji, Yoshida× Hideaki, Tashima× Shigeki, Ito× Miwako, Takahashi× Taiga, Yamaya |
|||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | [Objectives] 18F-FDG PET is useful for diagnosis of breast cancer. Compared to whole-body imaging, local breast imaging with a dedicated PET system can more clearly visualize the extent of the primary breast tumor and axillary lymph nodes metastasis. Breast-dedicated PET systems are categorized into two geometries: a ring-shaped detector arrangement and a dual flat-panel detector arrangement. Although the flat-panel system allows imaging axillary lymph nodes from a similar view as X-ray mammography, PET images are blurred (i.e. spatial resolution is degraded) in the direction perpendicular to the detectors due to the limited angular coverage. To compensate for this issue, we proposed a dual round-edge detector arrangement, in which the detector blocks at both edge positions were tilted toward the center of the field-of-view (FOV). The proposed detector arrangement is expected to reduce image blurring and improve spatial resolution while keeping the advantages of the dual panel arrangement. For a proof of concept, we developed a small prototype and evaluated the spatial resolution. [Methods] We used the crosshair light-sharing (CLS) detectors which had depth-of-interaction (DOI) and time-of-flight (TOF) measurement capabilities*. A 14×14 array of 1.45×1.45×15 mm3 GFAG scintillator was coupled with an 8×8 array of silicon photomultipliers (SiPMs) each with a photosensitive area of 3.0×3.0 mm2. DOI was digitalized into three bins. The data acquisition system was the TOFPET2 ASIC (PETsys Electronics), which was designed to digitize energy and time signals from photo sensors. The small prototype was composed of 32 detector blocks. We examined the conventional flat-panel arrangement and our proposed round-edge arrangement. A 22Na Derenzo-like multi-rod phantom (rod diameters: 1.6, 2.2, 3.0, 4.0, 5.0 and 6.0 mm) was used for spatial resolution measurement. The phantom was measured (90 min) in the two directions (coronal and axial planes) at the center of the FOV. [Results] In the coronal plane, the 1.6 mm rods were clearly resolved in both arrangements. In the axial plane, the round-edge arrangement significantly improved the spatial resolution compared with the flat-panel arrangement. While the conventional flat-panel arrangement could not resolve the 3.0 mm rods, the proposed round-edge arrangement resolved the 2.2 mm rods. [Conclusion] The proposed dual round-edge detector arrangement showed better spatial resolution than the conventional flat-panel arrangement while keeping the geometrical advantage for the breast PET imaging. (*Yoshida, et al. A crosshair light sharing PET detector with DOI and TOF capabilities using four-to-one coupling and single-ended readout. IEEE TRPMS 2020.) |
|||||
| 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 | SNMMI 2021 Annual Meeting | |||||
| 発表年月日 | ||||||
| 日付 | 2021-06-11 | |||||
| 日付タイプ | Issued | |||||
