US 2002/0054699 A1Published application

Device and method of computing a transformation linking two images

AssigneeKoninklijke Philips Electronics N.V.

InventorsPeter Roesch, Juergen Weese

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Abstract

The invention relates to a method of computing the transformation which transforms two different images (10, 10′) of an object one into the other while describing the motion or deformation of the object. In accordance with the method first the local transformation parameters are computed for sub-regions (1, 2, 3, 4, 5). By choosing the subregions so as to be sufficiently small, a rigid transformation can be used for this purpose. Starting from at least one first predetermined sub-region (1), the local transformation parameters of the neighboring sub-regions (2, 3, 4, 5) are successively computed, the starting values on which each computation is based being the already determined local transformation parameters of neighboring sub-regions. Using the local transformation parameters thus determined for sub-regions, the overall transformation can subsequently be computed.

Claims10

Dependent claims

A method of computing the transformation which transforms two images (10, 10′) of an object, preferably acquired by means of computed tomography or magnetic resonance tomography, one into the other, first the local transformation parameters being successively computed for sub-regions (1, 2, 3, 4, 5) of the images and subsequently the overall transformation being computed therefrom, characterized in that the successive computation of the local transformation parameters for the sub-regions is performed as follows:

a) the local transformation parameters are predetermined or computed for at least one first sub-region (1);
b) at least one sub-region (2) that has not yet been computed is formed or selected from among a quantity of predetermined sub-regions (2, 3, 4, 5);
c) for each sub-region (2) in the step b) the local transformation parameters are calculated, the local transformation parameters of at least one neighboring sub-region (1) that has already been successfully treated being used as starting values;
d) the steps b) and c) are repeated a number of times until the local transformation parameters have been computed for an adequate distribution of sub-regions.

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