@article{oai:repo.qst.go.jp:00044871,
 author = {Yoshida, Eiji and Yamaya, Taiga and Watanabe, Mitsuo and Kitamura, Keishi and Kobayashi, Ayako and Hasegawa, Tomoyuki and Obi, Takashi and Haneishi, Hideaki and Fukushi, Masahiro and Murayama, Hideo and 吉田 英治 and 山谷 泰賀 and 北村 圭司 and 小林 彩子 and 長谷川 智之 and 小尾 高史 and 羽石 秀昭 and 村山 秀雄},
 issue = {3},
 journal = {Japanese Journal of Medical Physics},
 month = {},
 note = {PET scanner are an important component in functional brain imaging devices. Several PET scanners have been developed during the last two decades for brain research studies. We are developing a high-performance brain PET scanner, jPET-D4.This scanner is designed to achieve not only high spatial resolution but also high sensitivity using four-layered depth-of-interaction (DOI) detectors. The scanner has five block detector rings with the ring diameter of 390 mm and each blockdetector ring consists of 24 DOI detectors. In previous work, we have demonstrated that 3 mm FWHM uniform spatial resolution within the field-of-view could be realized. In this paper, we describe the jPET-D4 system and evaluate its performance. The average energy resolution for 120 DOI detectors is optimized to 16 % +/- 1.0 %. The scater fraction for this system is 40 % with an energy window of 400-600 keV. The sensitivity for the point source is 102 kcps/MBq (10.2 %) with a 400 keV LLD. Maximum noise equivalent count rate (NECR) is 154 kcps at 11 kBq/ml with a 10 ns coinsidence time window. We evaluated scatter fraction and NECR following procedures based on NEMA NU-2-1994. These first evalution measurements indicate the jPET-D4 has good performance.},
 pages = {131--140},
 title = {Design and initial evaluation of a 4-layer DOI-PET system: the jPET-D4},
 volume = {26},
 year = {2006}
}