doi:10.1088/0031-9155/53/3/015

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量研学術機関リポジトリ「QST-Repository」は、国立研究開発法人量子科学技術研究開発機構に所属する職員等が生み出した学術成果（学会誌発表論文、学会発表、研究開発報告書、特許等）を集積しインターネット上で広く公開するサービスです。
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Permalink : http://id.nii.ac.jp/1657/00045071/

A proposal of an open PET geometry. 利用統計を見る

アイテムタイプ	学術雑誌論文 / Journal Article
言語	英語
著者	Yamaya Taiga Inaniwa Taku Minohara Shinichi Yoshida Eiji Inadama Naoko Nishikido Fumihiko Shibuya Kengo Lam ChihFung Murayama Hideo
抄録	The long patient port of a PET scanner tends to put stress on patients, especially patients with claustrophobia. It also prevents doctors and technicians from taking care of patients during scanning. In this paper, we proposed an 'open PET' geometry, which consists of two axially separated detector rings. A long and continuous field-of-view (FOV) including a 360 opened gap between two detector rings can be imaged enabling a fully 3D image reconstruction of all the possible lines-of-response. The open PET will become practical if iterative image reconstruction methods are applied even though image reconstruction of the open PET is analytically an incomplete problem. First we implemented a 'masked' 3D ordered subset expectation maximization (OS-EM) in which the system matrix was obtained from a long 'gapless' scanner by applying a mask to detectors corresponding to the open space. Next, in order to evaluate imaging performance of the proposed open PET geometry, we simulated a dual HR+ scanner (ring diameter of D = 827 mm, axial length ofW = 154 mm * 2) separated by a variable gap. The gapW was the maximum limit to have axially continuous FOV of 3W though the maximum diameter of FOV at the central slice was limited to D/2. Artifacts, observed on both sides of the open space when the gap exceeded W, were effectively reduced by inserting detectors partially into unnecessary open spaces. We also tested the open PET geometry using experimental data obtained by the jPET-D4. The jPET-D4 is a prototype brain scanner, which has 5 rings of 24 detector blocks. We simulated the open jPET-D4 with a gap of 66 mm by eliminating 1 block-ring from experimental data. Although some artifacts were seen at both ends of the opened gap, very similar images were obtained with and without the gap. The proposed open PET geometry is expected to lead to realization of in-beam PET, which is a method for an in situ monitoring of charged particle therapy, by letting the beams pass through the gap. The proposed open PET geometry will also allow simultaneous PET/CT measurements of the same PET FOV as the CT FOV, in contrast to the conventional PET/CT where each FOV is separated by several tens of centimeters.
雑誌名	Physics in Medicine and Biology
巻	53
号	3
ページ	757 - 773
発行年	2008-01
ISSN	0031-9155
DOI	10.1088/0031-9155/53/3/015
著者版フラグ	none

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