Patent ID: 7400756

Claim:
A method for calibration of perfusion parameter images, wherein image data from several images of an examination volume which have been generated in chronological succession using a tomographic imaging method are made ready, the method comprising: analyzing the image data using a perfusion model in order to obtain perfusion parameter values of the examination volume with spatial resolution; calibrating perfusion parameter values, obtained from the analysis, with a calibration factor to a physiological normal value, the calibration including, selecting an image area, which contains several different tissue compositions and in which approximately normal perfusion conditions are assumable, from a perfusion parameter image generated from the perfusion parameter values, performing a frequency analysis of the perfusion parameter values contained in the selected image area, selecting at least one frequency interval, which corresponds at least approximately to a frequency interval of the occurrence of perfusion parameter values of a known tissue composition, calculating a mean value of the perfusion parameter values in the selected at least one frequency interval, and performing a comparison with the physiological normal value for this tissue composition to determine at least one of the calibration factor and a calibration value included in the calibration factor.