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。 Welcome to QST-Repository where we accumulates and discloses the academic research results(Journal Publications, Conference presentation, Research and Development Report, Patent, etc.) of the members of National Institutes for Quantum and Radiological Science and Technology.
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DOI-PET detectors can provide good imaging performance even in the peripheral region of the PET FOV. In the development of DOI-PET detectors, one of the important steps toward their practical use is an evaluation of imaging performance such as the spatial resolution measured by using a point source and a one-pair system which simulates actual PET geometries. Because the DOI-PET detectors have an extended FOV compared with conventional detectors, evaluation including the region from the center to the periphery close to the detector ring is required to show their advanced performance for uniform spatial resolution. In this study, we proposed a one-pair system that can simulate an arbitrary ring diameter and acquire projection data efficiently by cutting unnecessary combinations according to the position of the point source. When we compared results by the full measurement scheme, the proposed system and our measuring scheme could significantly reduce the measurement time especially for a large ring size such as used in brain PET scanners. We used the system to evaluate the X'tal cube PET detector with a 2 mm crystal array arranged in a simulated PET geometry with the ring radius of 73 mm and 18 detector blocks. The results showed that uniform spatial resolution was achieved even in the peripheral region and measurements were obtained semi-automatically in a short time.
会議概要（会議名, 開催地, 会期, 主催者等）
2012 Nuclear Science Symposium, Medical Imaging Conference & Workshop on Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors
One-Pair Measurement System for Efficient Imaging Performance Evaluation of Prototype DOI-PET Detectors
