Appledorn C R, Oppenheim B E, Wellman H N
J Nucl Med. 1980 Feb;21(2):165-7.
The computer comparison of two images of the same organ requires proper alignment of the images before further computer processing. This alignment can be achieved by (a) fixing patient position during the study, (b) alignment methods using analytical transformations, or (c) operator interaction. We propose an automated method based upon the cross-correlation between projections of the images. With fast Fourier transforms, the algorithm becomes computationally cheap.
对同一器官的两张图像进行计算机比较，需要在进一步的计算机处理之前对图像进行适当对齐。这种对齐可以通过以下方式实现：(a) 在研究过程中固定患者位置；(b) 使用解析变换的对齐方法；或 (c) 操作员交互。我们提出了一种基于图像投影之间互相关的自动化方法。借助快速傅里叶变换，该算法在计算上变得很便宜。
