Patent ID: 7609802
Filing Date: 2009-10-27
Classification: A61B,G06T

Abstract:
1. A method for reconstructing an image volume of an object scanned in helical mode, the method comprising: obtaining one or more helical views corresponding to an image volume of an object; determining a plurality of discrete focal lengths within an imaging plane of a reconstructed field of view comprising the image volume; generating a plurality of circular scan sinograms for the plurality of discrete focal lengths, wherein the plurality of circular scan sinograms are generated by interpolating the one or more helical views; selecting one or more circular scan sinograms, from the plurality of circular scan sinograms, based on the plurality of discrete focal lengths, wherein the selection is performed within a backprojection operation, for one or more image points, over one or more circular views; using one or more of the selected circular scan sinograms, in the backprojection of one or more of the image points within the imaging plane over one or more of the circular views; and performing a backprojection for the one or more image points, over the one or more circular views to generate a reconstructed image of the object.