Abstract: A method is for determining correction coefficients or parameters, in particular channel correction coefficients and/or spacing coefficients, for detector channels for a computed tomograph. In the method, a scan is carried out in order to obtain a sinogram of a phantom (11) which is formed with a smooth cross-sectional profile and is inserted into the computed tomograph in such a way that two or more different attenuation values are detected in a full scan of virtually all the detector channels (3). Attenuation profiles that are obtained from the sinogram are subjected to high-pass filtering for each projection of the scan, in order to obtain discrepancies of an ideal profile which is predetermined by the phantom (11). A model function is matched to the discrepancies that are obtained for each of the detector channels (3) as a function of the detected attenuation values, from which the coefficients or parameters are obtained.

Abstract: A method is for determining correction coefficients or parameters, in particular channel correction coefficients and/or spacing coefficients, for detector channels for a computed tomograph. In the method, a scan is carried out in order to obtain a sinogram of a phantom which is formed with a smooth cross-sectional profile and is inserted into the computed tomograph in such a way that two or more different attenuation values are detected in a full scan of virtually all the detector channels. Attenuation profiles that are obtained from the sinogram are subjected to high-pass filtering for each projection of the scan, in order to obtain discrepancies of an ideal profile which is predetermined by the phantom. A model function is matched to the discrepancies that are obtained for each of the detector channels as a function of the detected attenuation values, from which the coefficients or parameters are obtained.