The present invention comprises a system and method for correcting for z-slope variations in detector cell outputs represented by data obtained by a scan in a CT system. According to one aspect of the invention, a final error factor, based upon a combination of a correction factor and an initial error factor, is applied to the data. The correction factor having a computational complexity independent of the order of correction desired. The present invention transfers all of the computational complexity of z-slope correction to a calibration process, thereby improving the computational speed and efficiency of producing an accurate image based on the scan data. In another aspect, the present invention improves image quality by providing a correction factor comprising a plurality of channel correction factors, where each of the plurality of channels is the center channel for a corresponding moving segment used to respectively determine each of the channel correction factors.

Claims

16 · 4 independent · depth 4

16 granted claims

›1.independentA system for producing a tomographic image of an object from projection data, comprising: an x-ray source emitting x-rays; a detector having a plurali…+3

›5.independentA system for producing a tomographic image of an object from a plurality of x-ray attenuation measurements, comprising: an x-ray source emitting x-ray…+3

›9.independentA method for correcting projection data for detector cell gain error in a computed tomography system, the system comprising an x-ray source emitting a…+3

›13.independentA method for correcting projection data for detector cell gain error in a computed tomography system, the system comprising an x-ray source for projec…+3

Classifications

2 codes

USPC · US Patent Classification

378/4378/901

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1.7 y

609 days filing → grant

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David V. Bruce

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