Patent ID: 7209535
Filing Date: 2007-04-24
Classification: G06T,Y10S

Abstract:
1. A computed tomography imaging system, comprising: an x-ray source producing divergent beams; a plurality of detector elements for receiving impinging x-ray beams emanating from the x-ray source for a series of projection views in which the source revolves around an object to be imaged; an acquisition system for acquiring from the detector elements x-ray attenuation data corresponding to each beam at each of the projection views; and an image reconstructor that receives the x-ray attenuation data from the acquisition system and performs the following steps to reconstruct an image: (a) backprojecting the x-ray attenuation data for each beam to form an array of data points therealong, (b) weighting each backprojected data point by a weighting factor ω(r), where r is the distance between the backprojected data point and a source location of the divergent beams to form weighted backprojected data points, (c) Fourier transforming and processing an array of data which includes the weighted backprojected data points to form an acquired k-space data set; (d) aligning the acquired k-space data set with a reference k-space, and (e) reconstructing an image from the referenced k-space data by performing an inverse Fourier transformation thereon.