Patent ID: 8804907

Claim:
A method for obtaining an item of spectrum information relating to X-rays about pixels in a grid pattern, comprising: providing an X-ray detector having a plurality of pixel elements each corresponding to a pixel in the grid pattern, each pixel element including a photodiode for registering light quanta, and wherein a scintillator material that converts X-ray quanta into light quanta for the photodiodes is arranged over the photodiodes; establishing both a read-out frequency that can be realized because of the X-ray detector's structural design and with which the pixel elements will be read out and reset for an image recording, and a dose, assigned to an X-ray source, per image recording in such a way that at most only a predefined portion of the pixel elements will receive light quanta during image recording using the established dose and established read-out frequency; for a plurality of times, operating the X-ray source in such a way that it will emit only the established dose, reading out the pixel elements using the established read-out frequency for obtaining a respective total energy of the light quanta impinging upon the respective pixel element and at least for one X-ray quantum deriving the energy of the X-ray quantum for a respective pixel element from total energies of such kind in accordance with a predefined rule; and combining the thus obtained information about the energy of X-ray quanta that have been assigned to the pixel elements.