Patent ID: 8620049

Claim:
A method for creating interventional roadmap images, comprising: recording at least two empty images in a mask phase with a matrix-type array of pixels by an x-ray system; recording at least two fill images in the mask phase with a matrix-type array of pixels by the x-ray device; storing the empty and fill images in an image processing system; arranging gray values of each pixel of the empty and fill images in ascending order by the image processing system; averaging smallest gray values from the empty and fill images to form a mask image by the image processing system; recording at least one current image by the x-ray system; subtracting the at least one current image from the mask image to create roadmap images by the image processing system; and displaying the roadmap images on a monitor, wherein the smallest gray values Gâ€²ij(n), n=1,Nâ‰¦K is averaged to form the mask image M ( i, j )=1 /NÎ£Gâ€² ij ( n ).