Hi,
I never used MRIcro for that purpose but it seems quite quick in SPM.
Use [Y,XYZ]=spm_read_vols(spm_vol(spm_get)) specifying binary mask as input
to get voxel values in Y.
Then use length(find(Y)) to get the number of non-zero voxels.
that number over voxel size will be the volume in mm3
Roman
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