This is a T1 weighted MRI head dataset courtesy of Jeff Orchard. More information is available at http://www.cs.uwaterloo.ca/~jorchard/mri/ Voxels outside the head have been set to zero to improve file compression. This was done by subtracting 32 from each of the 129 slices. These comments were added to the TIFF file using this macro: info = File.openAsString(""); setMetadata("Info:"+info);