@misc{oai:repo.qst.go.jp:00071359,
 author = {Nishikido, Fumihiko and Obata, Takayuki and Inadama, Naoko and Yoshida, Eiji and Suga, Mikio and Shimizu, Kodai and Atsushi, Tachibana and Ito, Hiroshi and Yamaya, Taiga and 錦戸 文彦 and 小畠 隆行 and 稲玉 直子 and 吉田 英治 and 清水 浩大 and 橘 篤志 and 伊藤 浩 and 山谷 泰賀},
 month = {Nov},
 note = {We are developing a PET system integrated with a birdcage RF coil for PET-MRI to realize highly sensitive PET system for simultaneous measurements. The PET detectors which consist of a scintillator block, photo sensors and front-end circuits with four-layer DOI encoding capability are placed close to the objective. Therefore, the proposed system can achieve high sensitivity without degradation spatial resolution at the edge of the field of view due to parallax error thanks to the four-layer DOI capability. If a shielding material is inside the RF coils, the RF pulse is blocked by the shielding material and then complete images cannot be obtained. Therefore, each RF coil element is inserted between the scintillator crystal blocks and then medially located in the shielding materials. We are developing an one-pair prototype system for evaluation of PET imaging performance. In this paper, we present about details of the one-pair prototype system and results of evaluation experiments with the one-pair prototype. 
The one-pair prototype system consists of eight PET modules and a birdcage RF-coil. The PET modules consist of six monolithic multi-pixel photon counter (MPPC) array (S11064-050P), a readout circuit, a four-layer DOI array and shielding box. The monolithic MPPC has 4 x 4 readout pixels. The size of readout pixels is 3 x 3 mm3. The six MPPC arrays arraigned on a line are soldered on the readout circuit board. 96ch readout signals from each MPPC pixel are reduced to 4 ch signals by a charge division circuit and fed to amplifiers on the circuit board. 
We developed the RF-coil for study of the proposed PET-MRI system. The coil is dedicated to a 3.0 T MRI. The PET detector can be mounted on gaps between the RF-coil elements and the distance of the PET detectors can change from 23.0 cm to 27.0 cm.
 In this paper, we present about details of the one-pair prototype system and results of evaluation experiment with the one-pair prototype., The 2013 IEEE Nuclear Science Symposium and Medical Imaging Conference, and Room-Temperature Semiconductor X-Ray and Gamma-Ray Detectors workshop},
 title = {One-pair prototype integrated system of DOI- PET and the RF-coil specialized for simultaneous PET-MRI measurements},
 year = {2013}
}