X-ray examination apparatus and radiation detector

An X-ray examination apparatus with an X-ray tube and an X-ray detector, comprising:

• an array of sensor elements;
• an addressing unit for selectively addressing subgroups of the sensor elements;
• a read-out arrangement for preprocessing and reading out the signals of sensor elements that have been addressed by the addressing unit;
• a control unit that is connected to the addressing unit and the read-out arrangement, the control unit being adapted to gain individually for the signals of all sensor elements of a subgroup each time a subgroup is addressed by the addressing unit, wherein the determination of the gain is based on information that does not depend on said signals.

A method for generating an image with an array of sensor elements, the method comprising the steps of;

• a) addressing a subgroup (i) of sensor elements;
• b) setting a gain individually for the signals of all sensor elements of said subgroup based on information that does not depend on said signals, and then preprocessing and reading out said signals;
• c) repeating steps a) and b) until all sensor elements of the array have been read out;
• d) composing an image from all preprocessed and read out signals.