ANALYTICAL RECONSTRUCTION METHOD FOR MULTI-RADIATION SOURCE INVERSE-GEOMETRY TYPE COMPUTED TOMOGRAPHY

PROBLEM TO BE SOLVED: To expand FOV (Field Of View) of an inverse-geometry constitution computed tomography (IGCT) without sacrificing the image quality, and provide a uniform cone angle, a uniform flux distribution in the whole region of interest to be scanned and uniform image noise. SOLUTION: IGCT sinogram is processed by at first rearranging it in "z" and secondly rearranging it in "xy" and is feathered when being rearranged in "xy". An equivalent of multi-axial third-generation sinogram is thus generated and the equivalent can be further processed using the parallel derivative and Hilbert transform. Alternatively, this method can generate reconstructed volume by applying TOM window (with feathering) method and a combined back projection method. COPYRIGHT: (C)2008,JPO&INPIT