X-ray or gamma ray systems or devices – Electronic circuit – Object responsive control
Patent
1998-01-05
2000-01-25
Bruce, David Vernon
X-ray or gamma ray systems or devices
Electronic circuit
Object responsive control
378 62, H05G 130
Patent
active
060185651
ABSTRACT:
An x-ray imaging system provides automatic adjustment of x-ray tube voltage and current based on an identification and removal of background pixels in the image and a calculation of the functional relationship between voltage and current and dose for the particular imaged object as deduced from two exposures at different voltages. Real-time image distortion removal and image rotation are accomplished by computer processing using a generalized image transformation polynomial. Scatter in the image is reduced by calculating a scatter map based on a blurring of the received image and normalizing the scatter map to point scatter measurements made with an x-ray occluder eliminating direct exposure of certain areas of the image. Improved signal to noise ratio in a moving x-ray image is provided by averaging stationary portions of the image over a longer time than the moving portions of the image. A non-linear white compression function further reduced image noise by transforming the raw image to a gray scale having equal noise intervals.
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Dykema Marcel J.
Ergun David L.
Kuipers Hendrik
Laanstra Geert Jan
Slump Cornelis H.
Bruce David Vernon
Lunar Corporation
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