Queen's Univ., Kingston, Ont.
IEEE Trans Med Imaging. 1992;11(4):560-9. doi: 10.1109/42.192692.
A method to remove the scattered background from a reconstructed image by deconvolution with a point response function which includes the scatter contribution is presented. The amplitude of the scattered response function is obtained by constraining a region of the corrected image to zero average amplitude. This method assumes that the shape of scatter distribution is shift invariant and independent of the shape of the scattering object and the distribution of the positron activity. The validity of these approximations for the QPET geometry was tested using simulations. An average scatter response function for the system was obtained from these simulations and compared with results from measurements. The method was tested using experimental data from an irregularly shaped acrylic phantom. It was simple to implement and resulted in a satisfactory correction of the scattered background for a small-volume system.
提出了一种通过反卷积从重建图像中去除散射背景的方法，该方法的点响应函数包含散射贡献。通过将校正图像的一个区域约束为零平均幅度，获得散射响应函数的幅度。该方法假设散射分布的形状是平移不变的，并且与散射物体的形状和正电子活性的分布无关。使用模拟测试了这些近似对于 QPET 几何形状的有效性。从这些模拟中获得了系统的平均散射响应函数，并将其与测量结果进行了比较。该方法使用来自不规则形状亚克力体模的实验数据进行了测试。它易于实现，并为小体积系统的散射背景提供了令人满意的校正。
