Patent Number: 6,298,109

Title: X-ray imaging system

Abstract: An x-ray imaging system provides automatic adjustment of x-ray tube voltage and current 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.

Inventors: Ergun; David L. (Verona, WI), Strait; David R. (Madison, WI), Slump; Cornelis H. (Oldenzaal, NL), Laanstra; Geert Jan (Almelo, NL), Kuipers; Hendrik (Hengelo, NL), Dijkstra; Marcel J. (Nijverdal, NL), van der Schaar; Hans Sjoerd Peter (Madison, WI)

Assignee: Lunar Corporation

International Classification: A61B 6/00 (20060101); G06T 5/00 (20060101); H05G 1/00 (20060101); H05G 1/60 (20060101); H05G 1/44 (20060101); H04N 5/217 (20060101); H04N 5/325 (20060101); H04N 5/321 (20060101); A61B 006/03 ()

Expiration Date: 10/02/2018