An improved quadrant-sharing BGO detector for a low cost rodent-research PET (RRPET)
An improved quadrant-sharing BGO detector for a low cost rodent-research PET (RRPET)
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一种改进的象限共享 BGO 探测器，用于低成本啮齿动物研究 PET (RRPET)
DOI：
10.1109/nssmic.2004.1466618
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
H. Baghaei
中科院分区：
文献类型：
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作者：
W. Wong;S. Xie;R. Ramirez;S. Kim;H. Li;Y. Zhang;J. Uribe;Y. Wang;H. Baghaei
这是一项旨在改进低成本高灵敏度啮齿动物研究 PET 相机 (RRPET) 探测器工程的研究。探测器系统是由锥形五边形块制成的实心BGO环，每个块有8/spl次/8个晶体，平均晶体间距为2.0 mm。探测器系统使用光电倍增管象限共享设计（PQS）的变体。 RRPET 块的第一个版本使用不同形状/尺寸的白漆反射器来控制 4 解码 PMT 的光分布。在这个改进版本中，白色油漆被新的 ESR 镜膜取代。该薄膜厚度为 0.06 毫米，机械性能坚固。该结构提供了非常高的晶体填充率（96% 线性），晶体之间的间隙仅为 0.08 毫米。薄膜结构更适合我们开发的用于制造 PQS 块的板夹层切片结构，因为薄膜减少了施工时间。与喷漆版本相比，平均光输出增加了 32%。最差晶体组（4个圆形PMT之间的间隙）和最好晶体组（靠近PMT中间）之间的光输出比（信号均匀性）从53%提高到63%。晶体解码分辨率也有所提高。检测效率的均匀性也得到了提高。各个晶体的能量分辨率从角晶体的 24% 提高到 19%，中心晶体的能量分辨率从 30% 提高到 22%。该薄膜还具有比涂料更好的机械精度，从而可以更准确地相对于彼此定位小晶体。
This is a study to improve the detector engineering of a low-cost high-sensitivity rodent-research PET camera (RRPET). The detector system is a solid ring of BGO made of tapered-pentagon blocks, each with 8/spl times/8 crystals and an average crystal pitch of 2.0 mm. The detector system used a variation of the photomultiplier-quadrant-sharing design (PQS). The first version of the RRPET blocks used white-paint reflectors of different shapes/sizes to control light distribution to the 4 decoding PMT. In this improved version, the white paint was replaced by a new ESR-mirror film. The film is 0.06 mm thick and mechanically robust. The construction provides a very high crystal-packing fraction (96% linearly) with a gap of only 0.08 mm between crystals. The film construction is more suitable for the slab-sandwich-slice construction we developed to make PQS blocks as the film reduces construction time. Average light output increased by 32% compared to the painted version. The light-output ratio (signal uniformity) between the worst crystal group (in the gap between 4 round PMTs) and the best crystal group (near the middle of a PMT) improved from 53% from 63%. The crystal-decoding resolution has also improved. The detection-efficiency uniformity has improved as well. The energy resolution for individual crystals has improved from 24% to 19% for the corner crystals and from 30% to 22% for the central crystals. The film also has better mechanical precision than paint, thereby positioning the small crystals more accurately relative to each other.
使用高产量堆积事件恢复方法的高速伽马相机设计的可行性。
DOI：
--
发表时间：
2001
期刊：
Journal of nuclear medicine : official publication, Society of Nuclear Medicine.
影响因子：
--
作者：
Wong,WH;Li,H;Uribe,J;Baghaei,H;Wang,Y;Yokoyama,S
通讯作者：
Yokoyama,S