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Improvement of PET image quality using DOI and TOF information.
https://repo.qst.go.jp/records/69056
https://repo.qst.go.jp/records/690569bfc93e1-90cb-428b-b33b-1127a202edee
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2007-07-23 | |||||
| タイトル | ||||||
| タイトル | Improvement of PET image quality using DOI and TOF information. | |||||
| 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 |
Kobayashi, Tetsuya
× Kobayashi, Tetsuya× 小林 哲哉 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | This paper investigates the benefit of depth-of-interaction (DOI) information in a time-of-flight (TOF) positron emission tomography (PET). TOF measurement, generally, has advantages to large bore scanners, and it improves signal-to-noise ratio of reconstructed images. On the other hand, DOI measurement has advantages to small bore scanners such as dedicated brain PET scanners or small animal PET scanners. DOI measurement provides uniform spatial resolution in the field-of-view (FOV) by minimizing resolution loss due to a parallax error. Therefore PET imaging using both TOF and DOI information has not investigated to date. We simulated two dimensional whole-body PET scanners with one-layer (i.e. non-DOI) and four-layer DOI capability using the GATE (Geant4 Application for Emission Tomography). The length of a short side of the crystal element was 2.9mm, and total thickness of the detector block of both scanners was 20mm. These scanners were assumed to have 200ps, 400ps and 800ps timing resolution. We developed a histogram based ordered-subsets expectation-maximization with accurate modeling of detector response and TOF kernel. Two simulations were performed to evaluate spatial resolution and contrast recovery. The results show that the spatial resolution, contrast recovery and their uniformity in the FOV degrades greatly with a parallax error of the non-DOI scanner; however the DOI scanner provides uniform resolution of approximately 2mm full width at half maximum in the whole FOV of 60cm diameter. Reconstruction with improved timing resolution provides higher contrast recovery at the low background noise level. | |||||
| 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 | Fully Three-Dimensional Image Reconstruction Meeting in Radiology and Nuclear Medicine | |||||
| 発表年月日 | ||||||
| 日付 | 2007-07-13 | |||||
| 日付タイプ | Issued | |||||
