You can find information about the voxel and world matrix in the image properties on the Output Inspector View.
The easiest (ideal) image is when the world and the voxel matrix correspond, so that one voxel is one world unit, and the world matrix is coronal (not tilted in any way). In case of an image taken in the sagittal position, voxel sizes may be different and the world matrix may be tilted.
In DICOM, the voxel thickness does not necessarily correspond to the distance between slices. In MeVisLab however, the calculated voxels close the slice distance.
Also see the
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