@inproceedings{oai:repo.qst.go.jp:00053946,
 author = {Shibuya, Kengo and Yoshida, Eiji and Nishikido, Fumihiko and Suzuki, Tosikazu and Tsuda, Tomoaki and Inadama, Naoko and Yamaya, Taiga and Murayama, Hideo and 澁谷 憲悟 and 吉田 英治 and 錦戸 文彦 and 鈴木 敏和 and 津田 倫明 and 稲玉 直子 and 山谷 泰賀 and 村山 秀雄},
 book = {World Congress of Medical Physics and Biomedical Engineering 2006 (IFMBE Proceedings ; Vol. 14)},
 issue = {1},
 month = {},
 note = {We provide a new viewpoint for a fundamental but little investigated problem in positron emission tomography (PET): non-collinearity of annihilation radiation from the human body. The cause of the angular deviation from 180 deg is described as well as how to evaluate it under a spatially distributed radiation source and a limited acquisition time. An elegant conversion from the photopeak spectrum into the angular distribution is done based on the conservation laws of momentum and energy to avoid problems in the direct measurement. A healthy volunteer study using 18FDG and a Ge semiconductor detector reveals the distribution as a Gaussian function with the FWHM of 0.54 deg. Finally, we calculate the physical limit of 18FDG-PET spatial resolution.},
 pages = {1554--1557},
 publisher = {Springer},
 title = {Limit of spatial resolution in FDG-PET due to annihilation photon non-collinearity.},
 volume = {14},
 year = {2006}
}