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An Automated Method for the Alignment of Image Pairs

Indiana University School of Medicine, Indianapolis, Indiana

Correspondence: For reprints contact: C. Robert Appledorn, Div. of Nuclear Medicine, Indiana Univ. School of Medicine, 1100 W. Michigan St., Indianapolis, IN 46223.

ABSTRACT

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.

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