like v the measurement of the gray scale level can refer to the pixel left and right or respectively above and below the abutting location of the abutting location or to a larger roi composed of n u00d7 m pixels respectively left and right or above and below the abutting location vi the correction values along the abutting location derived from the measured gray scale levels can be limited in order to avoid artifacts for example by means of a maximally permitted level dependent on the local signal or on a global threshold vii the gray scale level along the abutting location in y direction or x direction can be u201c homogenized u201d by filtering along the abutting location for example averaging averaging with thresholds median or the like or respectively can be freed of local subject contrasts viii the correction in the image region left or respectively right of a y abutting location or above and below an x abutting location is implemented with an x dependent or y dependent function u03bb this function decreases steadily from 1 to 0 viewed proceeding from the abutting location this function can be described with a straight line a polynomial or the like ix the u201c range u201d of the correction function u03bb i e the region from the abutting location at.