Patent ID: 7136450

Claim:
A method of adaptive scatter correction in the absence of scatter detectors for the input projection data in multi-energy X-ray computed tomography, wherein the input projection data include a set of low energy projections and a set of high energy projections acquired by scanning a set of objects using at least two x-ray spectra, wherein a low-pass filter of variable size is provided, comprising: A. Estimating the filter size of the low pass filter as a function of the input projection data, including: A1. Thresholding at least one set of projections into binary projections; A2. Filtering the binary projections; A3. Finding maximum of the filtered binary projections: A4. Calculating the filter size from the maximum found in A3; B. Computing amounts of scatter in the input projection data using the low-pass filter with the calculated filter size from A4; C. Correcting the input projection data for the scatter using the amounts of scatter computed from B.