基于SiPM的乳腺专用PET探测模块研制与评价

Development and Evaluation of SiPM Based Detector for Positron Emission Mammography

基于单点型硅光电倍增管(Si PM)与LYSO闪烁晶体,研制了一种新型乳腺专用PET探测模块,并对其性能进行研究。该探测模块采用28×28根1.9 mm×1.9 mm×15 mm的LYSO晶体组成阵列,与8×8个单点型Si PM组成的阵列通过光导耦合,所产生的脉冲信号分别经过模拟、定时电路处理后送入高速采样电路完成信号处理。该探测模块能够实现1.9 mm位置分辨,12.73%平均能量分辨以及2.66 ns双探头符合时间分辨,具有较好的分辨性能,能够满足乳腺专用PET成像的设计需求。

We have developed a detector module based on Silicon Photomultiplier （SiPM） and LYSO for Posi- tron Emission Mammography （PEM） imaging. The module consists of a 28 x 28 array of 1.9 x 1.9 x 15 mm3 （ pitch 2 mm） LYSO elements. The scintillation array is optically coupled to an 8 x 8 single channel SiPM array through a light guide. The moduleg signals were read out using analog circuit, timing circuit and then processed by the high speed data acquisition system. The results of performance test are presented. The detector module has a position resolution of 1.9 mm; has an average energy resolution of 12.7% ; has a coincidence timing reso- lution of 2.66 ns. The results show that the detector module has good resolutions performance, which could meet the needs of PEM imaging.