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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The X'tal cube is a PET detector we have developed. It has the new structure, which consists of a monolithic scintillation crystal block segmented 3-dimensionally into cubes and semiconductor photo-detectors are coupled on all sides of the crystal block. The crystal segment originating scintillation light can be identified by a simple position calculation with the photo-detector signals. Determination of the crystal segment provides radiation detected location inside the crystal block including depth of interaction (DOI) information which is necessary for a PET scanner to have both high sensitivity and high spatial resolution. We have already showed sufficient performance of the X'tal cube with the prototype using multi-pixel photon counters (MPPCs) for the photo-detectors and a 3-dimensional (3D) array of cubic crystals for the crystal block (array-X'tal cube). Because we newly succeeded to fabricate the 3D array by applying laser processing to a monolithic crystal for easy and reliable assembly, in this study, we evaluated performance of the X'tal cube using the monolithic crystal as the crystal block (laser-X'tal cube). The results showed high crystal identification performance and average energy resolution of 8.6 % for all crystal segments, which are superior to the array-X'tal cube performance.
Basic study of the PET detector
