1. A method of analyzing a data set of an object to be examined, which data set comprises voxels of at least a first type and a second type, said method comprising the following steps: a) classifying the voxels as voxels of the first, the second or further types; b) determining which of the voxels of the first type are boundary voxels that adjoin voxels of the second or further types; c) assigning a data value to each voxel of the first type, said data value representing a measure of the distance between said voxel and the nearest boundary voxel; d) classifying the voxels of the first type that have a distance data value exceeding a predetermined threshold as aberration voxels.