Method and apparatus for reducing spectrally-sensitive...

Details Method and apparatus for reducing spectrally-sensitive... Method and apparatus for reducing spectrally-sensitive...

2005-04-12

2005-04-12

Church, Craig E. (Department: 2882)

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

Reexamination Certificate

active

06879660

ABSTRACT:
A technique is provided in which a gain correction map derived for a detector at one X-ray spectrum may be adapted to accommodate images acquired by the detector at a different X-ray spectrum. The technique accounts for the physical variations in the detector which may produce spectrally-sensitive artifacts as well as for the particular image acquisition conditions. A technique is also provided for correcting edge artifacts in an acquired image by measuring median signal intensity within columns or rows of the image and deriving correction factors for the respective edge columns or rows based upon the trends of the median signal intensities. A technique is also provided for storing detector attributes during a manufacturing calibration process and accessing them during system operation such that a suitable gain correction factor is employed based upon the spectrum and operating conditions.

REFERENCES:
patent: 3848130 (1974-11-01), Macovski
patent: 4789930 (1988-12-01), Sones et al.
patent: 6266391 (2001-07-01), Albagli
patent: 6314160 (2001-11-01), Dhawale et al.
patent: 6393098 (2002-05-01), Albagli
patent: 6414315 (2002-07-01), Wei et al.

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