Hi Graham,

I'm a little confused by this. First let me note that it may not be
appropriate to mention 3dvolreg, since that is a completely
different story. Perhaps that is your real question, and not
acpc alignment?

Basically every acpc file that I can find here is cubic milimeter,
and is 191 x 236 x 171. I'm checking via the command (actually
this is repeated in a foreach loop using 'locate'):

3dinfo some.file+acpc.HEAD | grep extent

The output is consistently:

R-to-L extent: -95.000 [R] -to- 95.000 [L] -step- 1.000 mm [191 voxels]
A-to-P extent: -95.000 [A] -to- 140.000 [P] -step- 1.000 mm [236 voxels]
I-to-S extent: -70.000 -to- 100.000 [S] -step- 1.000 mm [171 voxels]

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So what are you doing to produce the datasets, and what
are you doing to check the dimensions?

- rick