@article{oai:repo.qst.go.jp:00045238,
 author = {Shibuya, Kengo and Nishikido, Fumihiko and Tsuda, Tomoaki and Kobayashi, Tetsuya and Lam, ChihFung and Yamaya, Taiga and Yoshida, Eiji and Inadama, Naoko and Murayama, Hideo and 澁谷 憲悟 and 錦戸 文彦 and 津田 倫明 and 小林 哲哉 and Ｌａｍ ＣｈｉｈＦｕｎｇ and 山谷 泰賀 and 吉田 英治 and 稲玉 直子 and 村山 秀雄},
 issue = {3},
 journal = {Nuclear Instruments & Methods in Physics Research Section A},
 month = {May},
 note = {Depth-of-interaction (DOI) detectors are considered to be advantageous for time-of-flight positron emission tomography (TOF-PET) because they can correct timing errors arising in the scintillation crystals due to a propagation speed difference between annihilation radiation and scintillation photons. We experimentally measured this timing error, using our four-layer DOI encoding method. The upper layers exhibited the larger timing delays due to the longer path lengths after conversion from annihilation radiation into scintillation photons that traveled by zigzag paths at a speed decreased by a factor of the refractive index (n). The maximum timing delay between the uppermost and the lowermost layers was evaluated as 164 ps when n=1.47. A TOF error correction was demonstrated to improve the timing resolution of the four-layer DOI detector by 10.3%, which would increase the effective sensitivity of the scanner by about 12% comparison with a non-DOI TOF-PET scanner. This is the first step towards combining these two important fields in PET instrumentation, namely DOI and TOF, for the purpose of achieving a higher sensitivity as well as a more uniform spatial resolution.},
 pages = {572--577},
 title = {Timing Resolution Improvement using DOI Information in a Four-Layer Scintillation Detector for TOF-PET},
 volume = {593},
 year = {2008}
}