Adaptive x-ray brightness and display control for a medical imag

Details Adaptive x-ray brightness and display control for a medical imag Adaptive x-ray brightness and display control for a medical imag

1995-12-14

1997-10-07

Wong, Don

X-ray or gamma ray systems or devices

Electronic circuit

With display or signaling

378 97, H05G 164

Patent

active

056756240

ABSTRACT:
An x-ray imaging system includes a source of x-rays, a video camera which produces an image signal formed by x-ray attenuation values, and image signal processor and a video monitor for displaying the x-ray image. The system also has an automatic image control that includes a peak detector, an average brightness detector and a transfer function generator for the image processor. The peak detector receives the image signal and produces a video gain control signal for controlling the video camera in response to a comparison of a peak level of the image signal to a peak reference level. The average the brightness detector employs the image signal to produce a feedback signal which controls by the source of x-rays. The transfer function generator produces a histogram of intensity levels in the image signal which histogram forms a look-up table that is used by the image processor to transform the image signal into the adjusted image signal for display.

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patent: 5319696 (1994-06-01), Abdel-Malek et al.
patent: 5396531 (1995-03-01), Hartley
patent: 5400383 (1995-03-01), Yassa et al.

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