Patent ID: 7156554
Filing Date: 2007-01-02
Classification: A61B,G06T

Abstract:
1. A method of compensating for image faults in a digital x-ray image recorded by an x-ray system having a radiographic source, an anti-scatter grid and a digital x-ray detector, wherein the image faults result from de-centering, defocusing or defects in the anti-scatter grid or from the Heel effect, the image faults leading to an intensity reduction of primary radiation falling on the x-ray detector, the method comprising: determining a first intensity of the primary radiation before the primary radiation hits the anti-scatter grid; determining a second intensity of the primary radiation after the primary radiation has hit the anti-scatter grid; determining a reduction in intensity of the primary radiation caused by the anti-scatter grid based on the first and second intensities; determining a set of correcting parameters based on the determined reduction in intensity of the primary radiation; and correcting the x-ray image using the set of correcting parameters.