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2. 发明授权

US4980552A High resolution PET scanner using rotating ring array of enlarged detectors having successively offset collimation apertures 失效
标题翻译：高分辨率PET扫描仪，使用具有连续偏移准直孔的放大检测器的旋转环阵列
公开(公告)号：US4980552A
公开(公告)日：1990-12-25
申请号：US368707
申请日：1989-06-20
申请人： Zang-Hee Cho , Monte S. Buchsbaum , William E. Bunny , Richard M. Friedenberg , Edward K. Wong, Jr.
发明人： Zang-Hee Cho , Monte S. Buchsbaum , William E. Bunny , Richard M. Friedenberg , Edward K. Wong, Jr.
IPC分类号： A61B6/03 , G01T1/161 , G01T1/164 , G01T1/29
CPC分类号： G01T1/2985 , A61B6/037 , G01T1/1644
摘要： A greatly reduced number of scintillation cyrstal/PMT gamma ray detectors are employed in a ring array about a PET image volume. Because of the relatively small number of such detectors, the complexity and expense of associated electronic signal processing channels is greatly reduced (even if each such channel is provided with sophisticated time of flight capabilities). Similarly, because relatively fewer crystals are employed, it becomes possible to use much larger and faster response time scintillation crystals so as to greatly increase gamma ray detection efficiency and scatter rejection while also permitting the electronic circuits to better reject random events and to provide effective time of flight image data filtering. By providing successively offset collimation apertures for each successive detector of the ring array and by rotating the array 360 degrees through a large number of successive view angle positions, it is nevertheless possible to acquire extremely high resolution image data with a greatly reduced system cost. A multiple aperture embodiment provides improved sensitivity by using associated light collimators and photodiodes in conjunction with slow coincidence steering circuits.
摘要翻译：在围绕PET图像体积的环阵列中使用大量减少数量的闪烁晶体/ PMTγ射线检测器。由于这种检测器数量相对较少，相关电子信号处理通道的复杂性和费用大大降低（即使每个这样的信道都具有复杂的飞行时间）。类似地，由于使用相对较少的晶体，所以可以使用更大更快的响应时间闪烁晶体，从而大大增加伽马射线检测效率和散射抑制，同时还允许电子电路更好地拒绝随机事件并提供有效时间的飞行图像数据过滤。通过为环阵列的每个连续检测器提供连续的偏移准直孔，并且通过大量连续的视角位置使阵列360度旋转，仍然可以以大大降低的系统成本获得极高分辨率的图像数据。多孔实施例通过使用相关的光准直仪和光电二极管结合缓慢的重合转向电路来提供改进的灵敏度。

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