X-ray or gamma ray systems or devices – Specific application – Computerized tomography
Patent
1998-08-25
2000-04-25
Bruce, David V.
X-ray or gamma ray systems or devices
Specific application
Computerized tomography
378901, A61B 603
Patent
active
060552905
ABSTRACT:
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.
REFERENCES:
patent: 4284950 (1981-08-01), Burl et al.
patent: 5610963 (1997-03-01), Hsieh
Besson Guy M.
Bromberg Neil B.
Xie Min
Bruce David V.
Cabou Christian G.
General Electric Company
Price Phyllis Y.
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