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US 5,400,255 AGranted
Reconstruction of images from cone beam data
AssigneeGeneral Electric Company
InventorHui Hu
Life of this patent
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Abstract
A computed tomography x-ray imaging system acquires a three-dimensional array of x-ray attenuation values using a cone beam x-ray source [(13)] and a curved two-dimensional array of detector elements [(16)]. Two-dimensional image slices [(55)] are reconstructed using a filtered back projection method, and corrections are made to the images to account for inaccuracies in the reconstruction method and for incomplete data due to the cone beam geometry.
Claims5
A computed tomography imaging system which comprises:
- a two-dimensional array of detector elements for receiving photons emanating in a cone beam from a source;
- a digital acquisition system for acquiring two-dimensional arrays of cone beam data from the array of detector elements at a series of views in which the array of detector elements revolves around a central axis;
- a filter for receiving the cone beam data and filtering the same;
- means for back projecting the filtered cone beam data to produce image data f.sub.M0 (r);
- row summing means for receiving the cone beam data and summing the values therein along one of two dimensions of said two-dimensional arrays of cone beam data to form one-dimensional arrays of row sum data;
- means for filtering the row sum data;
- means for back projecting the filtered row sum data to produce corrective image data f.sub.M1 (r);
- and
- summing means for combining the image data f.sub.M0 (r) with the correction image data f.sub.M1 (r) to produce an image slice.
6 more elements
Dependencies are inferred from the claim text.