Patent ID: 7778386

Claim:
A method of window-based cone-beam reconstruction for a multi-axial Computed Tomography (CT) dataset, wherein the CT dataset is acquired using longitudinally-offset x-ray beams emitted from multiple x-ray point sources distributed at least longitudinally, wherein the multiple x-ray point sources distributed at least longitudinally further includes multiple trans-axial offset x-ray point sources, the method comprising: obtaining projection data from the multi-axial CT dataset; applying to the projection data a derivative that parallels a trajectory of the trans-axially offset x-ray point sources applying a Hilbert transform to the projection data after the derivative step; performing backprojection; and outputting a reconstructed volume, wherein the reconstructed volume is a three-dimensional representation of an object scanned by an inverse geometry computed tomography (“IGCT”) system, and wherein backprojection for each trans-axial x-ray point source is done independently of the data from other x-ray point sources.