Patent ID: 7885372

Claim:
An energy-sensitive computed tomography system, comprising: a gantry configured to rotate around an object; an X-ray source coupled to said gantry and configured to emit an X-ray beam to be incident upon the object; a detector coupled to said gantry, said detector comprising a plurality of detector elements configured to receive the X-ray beam transmitted through the object and produce a plurality of signals that represent intensity data of the X-ray beam; a filter disposed between said X-ray source and said detector, said filter comprises a first plurality of sections configured to shape a portion of the X-ray beam to be received by a first subset of said plurality of detector elements into a total energy spectrum, and a second plurality of sections configured to shape a portion of the X-ray beam to be received by a second subset of said plurality of detector elements into a high energy spectrum; a computer coupled to the detector, wherein said computer is configured to: interpolate intensity data of at least one of the high-energy spectrum and the total-energy spectrum, and determine, from the interpolated intensity data, intensity data corresponding to a low-energy spectrum.