In 3-dimensional reconstruction from paralleled serial medical images

the two problems of contour correspondence and slice registration are often encountered. In the new method proposed in this paper

every contour in a slice is designated a value that represents its size and density

then the overall“Centroid”of the slice is found. For each contour

its corresponding contour on the adjcent slice is determined based on their designated value and their polar coordinate to the slice centroid. Some measures are taken to diminish computation complexity at a large scale. For the aim of slice registration

adjacent slices are first aligned roughly according to their centroid

furthermore

the optimal registration position nearby which minimizes the efficacy function which reflects the matching suitability at a given position. A witty method is designed to simulate the distribution of contours on adjacent slices. After testing the algorithms on the simulated case many times

we find that they are highly accurate and effective. Several optimal parameters are also given by experiment.