公开(公告)号：US4291228A

公开(公告)日：1981-09-22

申请号：US70372

申请日：1979-08-28

Applicant: Christopher J. Thompson

Inventor： Christopher J. Thompson

IPC: G01N23/04 ,  A61B6/03 ,  G01T1/161 ,  G01T1/20 ,  G01T1/202 ,  G01T1/29

CPC classification number: G01T1/2985 ,  G01T1/202 ,  A61B6/037

Abstract: A circular array of detectors is used for detecting coincident events and the point of annihilation in a positron annihilation process in a selected plane wherein the output from the detectors is processed in a computer to provide image reconstruction for the selected plane. Bismuth germanate is shown to be more efficient than previously used detectors and the adaption of trapezoidal shape for the detectors enables more efficient utilization of the photons produced in the process. The use of absorbing metal reducing plugs between adjacent detectors may be used to decrease the aperture function of the detectors for low angles of incident radiation.

Abstract translation: 检测器的圆形阵列用于检测所选平面中的正电子湮灭过程中的重合事件和湮灭点，其中来自检测器的输出在计算机中被处理以为所选择的平面提供图像重建。 锗酸铋被证明比以前使用的检测器更有效，并且用于检测器的梯形形状的适应使得能够更有效地利用在该过程中产生的光子。 在相邻检测器之间使用吸收金属减少塞可以用于降低用于低入射辐射角的检测器的孔径函数。