while using ROI editor tool in mrview I realized it seems to duplicates the number of axial slices. Indeed, while sliding across slices, the 3rd voxel index number (e.g. 22) remains the same for 2 consecutive cursor’s slidings, as if it could go below the axial image resolution. However, the ROI traced for that slice results the same for both slidings. Please find attached two exemplary images where axial voxel index remains 22 , while axial view slightly changes, to better understand.