Patent ID: 8218717
Filing Date: 2012-07-10
Classification: A61B,G06T

Abstract:
1. A method for reconstructing a 3D image dataset of an object with an imaging system having an X-ray source and an x-ray detector, comprising: acquiring a series of two-dimensional arrays of cone beam data from the x-ray detector while the x-ray source moves along a variable radius, non-circular path having a planar trajectory around the object, the trajectory being described by a series of source points along the non-circular path serially numbered by a counter parameter; differentiating the acquired cone beam data with respect to the counter parameter of the planar trajectory at a fixed x-ray ray direction to produce a derivative of the cone beam data; filtering the derivative with a Hilbert-like filter to produce a filtered cone beam data; multiplying the acquired cone beam data with a redundancy weighting function before the differentiating step or multiplying the filtered cone beam data with the redundancy weighting function after the filtering step to produce a processed cone beam data; and back-projecting the processed cone beam data for reconstructing the 3D image dataset.