Dear Marris,
To make sure, the origin should be close to the anterior commissure AC, not the anterior cingulate cortex ACC.
Based on the attached image it might also be necessary to rotate the raw data, as it seems to be tilted backward relative to the templates when looking from the side, which might have been too large for the algorithm. You could adjust the orientation manually e.g. via the Display option based on "pitch", the unit is radian. Look at the templates or http://imaging.mrc-cbu.cam.ac.uk/imaging/FindingCommissures to get an impression on how data should look like ideally.
Best
Helmut
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