Presentation Development of second add-on PET/MRI prototype: Evaluation of PET imaging performance

錦戸, 文彦  ,  藤原, 理伯  ,  岩男, 悠真  ,  田島, 英朗  ,  吉田, 英治  ,  菅, 幹生  ,  清水, 啓司  ,  小畠, 隆行  ,  山谷, 泰賀

2017-04-13
Description
[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

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