Patent ID: 7038451

Claim:
A device for determining the Modulation Transfer Function (MTF) of a magnetic resonance system, comprising: an image evaluation unit for determining a mean value and a standard deviation of intensity values of a plurality of image pixels included in a Region of Interest of a cross-sectional image of a stripe structure arranged transversely relative to an image recording plane of a phantom, the stripe structure having a number of alternately arranged magnetic-resonance-active material layers and magnetic-resonance-inactive material layers including an arrangement periodicity, the cross-sectional image recorded by a magnetic resonance system and the stripe structure having a space factor greater than 0.5 in a relevant Region of Interest included in the cross-sectional image; a computing unit for calculating the quotient of the mean value and the standard deviation; a memory computing device for determining at least one of a plurality of stripe structures having different space factors for use with the image evaluation unit; and an assignment computing unit for calculating the Modulation Transfer Function (MTF) relative to a local frequency given by the arrangement periodicity of the determined stripe structure and relative to the space factor of the determined stripe structure, wherein the space factor of the determined stripe structure and the quotient of the mean and the standard deviation are used when calculating the Modulation Transfer Function (MTF).