Dept. of Electr. & Comput. Eng., Calgary Univ., Alta.
IEEE Trans Med Imaging. 1992;11(3):336-41. doi: 10.1109/42.158937.
A restoration scheme for single photon emission computed tomography (SPECT) images that performs restoration before reconstruction (preconstruction restoration) from planar (projection) images is presented. A comparison is performed between results obtained in this study and those obtained by a method reported previously where the restoration is performed after reconstruction (postreconstruction restoration). The filters investigated are the Wiener and power spectrum equalization filters. These filters are applied to SPECT images of a hollow cylinder phantom and a cardiac phantom acquired on a Siemens Rota camera. Quantitative analyses of the results are performed through measurements of contrast ratios and root mean squared errors. The preconstruction restored images show a significant decrease in the root mean squared error and an increase in contrast over the postconstruction restored images.
提出了一种单光子发射计算机断层扫描（SPECT）图像的重建前恢复（重建前恢复）方案，该方案从平面（投影）图像进行恢复。对本研究中获得的结果与先前报道的在重建后进行恢复（重建后恢复）的方法获得的结果进行了比较。研究的滤波器是维纳滤波器和功率谱均衡滤波器。这些滤波器应用于在西门子 Rota 相机上获取的空心圆柱模型和心脏模型的 SPECT 图像。通过对比度比和均方根误差的测量对结果进行定量分析。与重建后恢复的图像相比，重建前恢复的图像的均方根误差显著降低，对比度增加。
