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.