中文摘要：

小动物正电子发射断层成像仪（PET）探测器的性能直接决定系统的性能,设计高分辨率、高灵敏度的探测器单元是小动物PET研究的热点.综述几款经典的环形探测器、平板型探测器以及商业化小动物PET的特点和性能,主要从组成探测器单元的晶体、光电倍增管层面分析总结小动物PET探测器技术的发展状况,并且展望小动物PET在新的深度效应（DOI）方法、半导体探测器以及通用电子学设计方面的发展前景.

英文摘要：

The performance of PET for small animal examination is largely dependent on the performance of the detector. Therefore, the designing for detector units with high resolution and high sensitivity becomes one of crucial issues in the investigation of small animal PET. This paper reviews the characteristics and performance of ring or fiat panel detectors and a number of commercial PET for small animal examination. We made analysis with and summarized the development of the PET detector technology from components of a detector unit such as crystal and PMT. The development directions of determining new DOI, exploring new semiconductor detectors and designing for universal electronics are discussed as well.