Are the jagged bits about every 4mm, with zeros on the outside? If
so, then this is normal. If the field of view of the original images
does not cover all of the region that you expect to see in the
spatially normalised images, then SPM has to assign these unknown voxels
a value of zero (or NaN in some cases). The edges of these zeros probably
look extra-jagged because of the 4mm resolution.
Regards,
-John
| I recently normalized several brains and found that I had trouble
| with 2 out of 8. In one case, the axial images were collected at a
| slight angle away from the AC-PC line. In the other case, the
| non-normalized images look fine (i.e., were collected parallel to the
| AC-PC line). However, in both cases, the normalized images appear jagged
| around the edges. Does anyone have any ideas about why this might be the
| case? By the way, I used the EPI template to normalize.
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