DESIGN AND ENGINEERING ASPECTS OF A HIGH-RESOLUTION POSITRON TOMOGRAPH FOR SMALL ANIMAL IMAGING
DESIGN AND ENGINEERING ASPECTS OF A HIGH-RESOLUTION POSITRON TOMOGRAPH FOR SMALL ANIMAL IMAGING
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DOI：
10.1109/23.322930
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发表时间：
1994-08-01
影响因子：
1.8
通讯作者：
ROULEAU, D
中科院分区：
文献类型：
--
作者：
LECOMTE, R;CADORETTE, J;ROULEAU, D
我们描述了Sherbrooke正电子发射层析成像仪，一个非常高分辨率的设备，专门用于小实验动物的动态成像。其显著特点是：基于雪崩光电二极管（APD）的小型离散闪烁探测器，实现均匀、各向同性、极高的空间分辨率；并行处理低死区和高计数率能力；提高灵敏度和散射校正的多光谱数据采集硬件；模块化，允许设计的灵活性和可升级性。该系统实现了“蛤壳”采样方案和旋转杆传输源。所有采集参数均可在计算机控制下调整。通过使用热电模块确保探测器现场的温度稳定性。初始系统由一层256个模块（两个检测器环）组成，在直径为118毫米，厚度为10.5毫米的视场中定义3个图像切片。使用4层模块（8环探测器），轴向场可以扩展到50毫米。综述了基于apd的PET扫描仪的设计限制和工程方面的问题，并报告了初步结果。
We describe the Sherbrooke positron emission tomograph, a very high resolution device dedicated to dynamic imaging of small laboratory animals. Its distinctive features are: small discrete scintillation detectors based on avalanche photodiodes (APD) to achieve uniform, isotropic, very high spatial resolution; parallel processing for low deadtime and high count rate capability; multispectral data acquisition hardware to improve sensitivity and scatter correction; modularity to allow design flexibility and upgradability. The system implements the ''clam-shell'' sampling scheme and a rotating rod transmission source. All acquisition parameters can be adjusted under computer control. Temperature stability at the detector site is ensured by the use of thermoelectric modules. The initial system consists of one layer of 256 modules (two rings of detectors) defining 3 image slices in a 118 mm diameter by 10.5 mm thick field. The axial field can be extended to 50 mm using 4 layers of modules (8 rings of detectors). The design constraints and engineering aspects of an APD-based PET scanner are reviewed and preliminary results are reported.