@misc{oai:repo.qst.go.jp:00067915,
 author = {Yamaya, Taiga and et.al and 山谷 泰賀},
 month = {Oct},
 note = {A high-performance brain PET scanner, jPET-D4, which provides depth-of-interaction (DOI) information, is under development. The scanner is designed to achieve not only high spatial resolution but also high scanner sensitivity with the DOI information obtained from multi-layered thin crystals. The scanner has 5 rings of 24 detector blocks each, and the detector block consists of 1,024 GSO crystals of 2.9mm x 2.9mm x 7.5mm, which are arranged in 4 layers of 16 x 16 arrays. At this stage, a pair of detector blocks and a coincidence circuit has been assembled into an experimental prototype gantry. In this paper, as a preliminary experiment, we have investigated the performance of the jPET-D4's inherent spatial resolution and noise characteristics using the prototype system. Spatial resolution and background noise were measured by using a line source and a uniform cylinder phantom respectively. To avoid systematic error and reduce computational cost in image reconstruction, the DOI compression (DOIC) method followed by the ML-EM with accurate system modeling, that we have previously proposed, was applied. Experimental results showed that the jPET-D4 achieves less than 3mm spatial resolution over the field-of-view. Trade-off results between spatial resolution and background noise also promise an excellent performance of the scanner., IEEE 2004 Nuclear Science Symposium and Medical Imaging Conference},
 title = {Preliminary Performance Evaluation of the Prototype System for a Brain DOI-PET Scanner: jPET-D4},
 year = {2004}
}