1. An apparatus for correcting distortion in medical images, comprising: a data receiving unit for receiving first medical image data, second medical image data and third medical image data, wherein the first medical image data has a first distortion of a first distortion type and the second medical image data has the first distortion and a second distortion of a second distortion type, wherein the first distortion and the second distortion are cumulative; a representation unit for determining a representation of the first distortion by comparing the first medical image data to third medical image data, and for determining a representation of the second distortion in the absence of the first distortion; and an image correction unit for correcting the second distortion in the second medical image data using the representation of the first distortion and the representation of the second distortion.