| Thanks for your reply. I think I've found the answer. Somehow, the
| header information was changed for a portion of the files, where the
| number of slices was reduced (from 36 to 20, which happens to be close
| to the mean location of the origin in these files). When these files
| were mixed with files with the correct Z dimensions in the header, then
| ALL files (those with and those without the correct Z dimension) were
| masked to the same limited number of slices.
|
| Is this an expected feature of spm99?
By default, if a voxel can not be sampled (because it is outside the image)
in one or more of the files, then that voxel is set to zero in all the
spatially normalised volumes for that subject. This is to reduce movement
related artifacts at the edge of the FOV.
All the best,
-John
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