Patent ID: 9592014
Date: 2017-03-14
CPC Classifications: A61B

Claim:
1. A method of enhancing a displayed exposure image in an x-ray system comprising an x-ray source, a single essentially round collimator, a detector, a monitor and means for moving said collimator in a plane generally parallel to the plane of said collimator, said collimator comprising an aperture that allows all the radiation to pass through, an outer annulus that reduces the radiation passing through at an amount depending on the material and the thickness of the material and an inner annulus between said aperture and said outer annulus, with thickness changing as a function of the distance from the aperture, starting at thickness zero on the side of the aperture and ending at the thickness of the outer annulus on the side of the outer annulus, comprising: wherein calculating normalization factors for said inner annulus comprises dividing said inner annulus into a plurality of annuli and assigning a single theoretical DPP to each said plurality of annuli depending on its distance from said aperture.