In the FreeSurfer sense, *conformed* means that the volume is in coronal primary slice direction, has dimensions 256x256x256 and a voxel size of 1 mm in all 3 directions. The slice direction can only be determined if the header contains RAS information, if it does not, the volume is not conformed.
mghheader.is.conformed(header)| header | Header of the mgh datastructure, as returned by |
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logical, whether the volume is *conformed*.