Method of correcting an X-ray image recorded by a digital X-ray detector and calibrating an X-ray detector

A method of calibrating a digital X-ray detector, comprising:

• defining a parameter space using at least a first parameter related to a recording condition of an X-ray image;
• deriving a grid of parameter configurations covering the parameter space point by point in its entirety using a quantization rule for the parameter space;
• and
• recording a gain image for each parameter configuration.

An X-ray device, comprising:

• a digital X-ray detector;
• and
• an image processing unit for correlating an X-ray image recorded by the X-ray detector with a gain image, wherein
• the image processing unit comprises:
• a memory device for storing a plurality of gain images;
• and
• a selection module for selecting at least one stored gain image for correlating with the X-ray image using a distance between a first parameter configuration related to the gain image and a second parameter configuration related to the X-ray image within a parameter space defined by at least one parameter related to a recording condition of the X-ray.