Interventional roadmap method with optimization of the mask phase
AssigneeSiemens Aktiengesellschaft
InventorsRudolf Leiblein, Martin Spahn
Life of this patent
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Abstract
An interventional roadmap method with optimization of the mask face is proposed. At least two empty images and at least two fill images are recorded in a mask phase A with a matrix-type array of pixels and stored. The empty and fill images are processed such that the gray values of each pixel of the x-ray images from mask phase A are arranged in ascending order. A mask image is computed from the processed empty and fill images such that the smallest gray values are averaged and from which the mask image will be formed. At least one current x-ray image is recorded and subtracted from the mask image to create roadmap images.
Claims10
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 G′ij(n), n=1,N≦K is averaged to form the mask image
- M(i, j)=1/NΣG′ij(n).
Dependencies are inferred from the claim text.