Dear Henryk,
There are technical limitations of course, but a 64x64 matrix as such doesn't provide any information on the voxel resolution. In case the field of view of a 64x64 matrix is small then the voxel resolution could actually be smaller than the voxel resolution of a 128x128 matrix with a larger FoV (which is rather unrealistic due to practical considerations, but that's another issue). In any case, this is why one should report all the relevant information, e.g. FoV and voxel resolution or alternatively FoV and matrix size.
Best
Helmut
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