Floyd C E, Jaszczak R J, Greer K L, Coleman R E
J Nucl Med. 1985 Apr;26(4):403-8.
A deconvolution algorithm has been developed which compensates for Compton scattering in SPECT images. Compton scatter is modeled as a convolution of the nonscattered projection data with an exponential function. Deconvolution of the total (scatter + nonscatter) projection data yields compensated true projection. Using Monte Carlo methods, the scattered and nonscattered components of a SPECT image are simulated thus allowing a comparison of scatter compensated results with direct nonscatter results. The quality of the compensation is evaluated by comparing the ratio of total to direct counts with the ratio of compensated to direct counts. This deconvolution technique has been developed and evaluated for experimentally acquired SPECT data as well as for simulated data.
已经开发出一种反卷积算法，该算法可补偿单光子发射计算机断层扫描（SPECT）图像中的康普顿散射。康普顿散射被建模为非散射投影数据与指数函数的卷积。对总（散射+非散射）投影数据进行反卷积可得到补偿后的真实投影。使用蒙特卡罗方法，模拟了SPECT图像的散射和非散射分量，从而可以将散射补偿结果与直接非散射结果进行比较。通过比较总计数与直接计数的比率以及补偿计数与直接计数的比率来评估补偿质量。这种反卷积技术已针对实验获取的SPECT数据以及模拟数据进行了开发和评估。
