[Freesurfer] Error with mris_calc

Dear Freesurfer community,

Using freeview, I can visualize that two binary volumes are overlaying in some parts. freeview -v binF1.mgz -v binF2.mgz

When using the command mris_calc -o out.mgz binF1.mgz mul binF2.mgz to create the intersection of these two volumes, I obtain a file with only zeros. To debug, I added the two volumes mris_calc -o out.mgz binF1.mgz add binF2.mgz I was surprise to see that one of the volumes (binF1) is shifted of tens of voxels along an axis. When doing mris_calc -o out.mgz binF2.mgz add binF1.mgz, the binF2 is shifted.

Is that a bug ?

mris_calc : v.1.37.2.4 2011/04/04 freeview : v1.0 2011/05/22

Best,

Christopher