@misc{oai:repo.qst.go.jp:00066324,
 author = {錦戸, 文彦 and 藤原, 理伯 and 岩男, 悠真 and 田島, 英朗 and 吉田, 英治 and 菅, 幹生 and 清水, 啓司 and 小畠, 隆行 and 山谷, 泰賀 and 錦戸 文彦 and 藤原 理伯 and 岩男 悠真 and 田島 英朗 and 吉田 英治 and 菅 幹生 and 小畠 隆行 and 山谷 泰賀},
 month = {Apr},
 note = {[Purpose] We proposed an add-on PET system integrated with a birdcage RF-coil for PET/MRI system based on 4-layered depth-of-interaction (DOI) detectors. The PET detectors are placed close to a head to achieve both high sensitivity and high spatial resolution even at the edge of the field of view (FOV). We constructed a new RF-coil for a second prototype of add-on PET, which is combined with 24 DOI-PET detectors and evaluated performance.
[Methods] The second prototype consisted of an RF-coil and 24 PET detector units with two PET detectors each. The detector units were shielded with carbon fiber shielding boxes. Each PET detector consisted of a 14 x 14 x 4-layer array of lutetium fine silicate (LFS) crystals (1.9 mm x 1.9 mm x 4.0 mm), an 8 x 8 multi-pixel photon counter (MPPC, S12641PA-050) array and a readout circuit board with an ASIC. The RF coil was dedicated to a 3T MRI (MAGNETOM Verio, Siemens). 
In the evaluation, PET detector performances in simultaneous measurement and spatial resolutions of PET images were measured with a 22Na point-like source and a mini Derenzo phantom. Spin echo (SE) and echo planer imaging (EPI) techniques were used in the evaluation experiment of the simultaneous measurements. 
[Results] The influence of the simultaneous measurements with MRI on the PET performance was negligible. All of 1.6 mm hot rods were distinguished in the phantom ezperiment. 
[Conclusion] The influence of the simultaneous measurements with MRI on the PET performance was negligible. In addition, the superior spatial resolution of the PET images was obtained., 第113回医学物理学会学術大会},
 title = {Development of second add-on PET/MRI prototype: Evaluation of PET imaging performance},
 year = {2017}
}