On Thursday 08 January 2009 15:29:47 Dave Brohawn wrote: > I would like to create a functional constraint including only the 25% > most active voxels (top quartile). > > Is there a command that can achieve this? >
You can use 'mris_calc' (the development version): $>mris_calc someVolume.mgz stats --> will dump min/max/mean/std data Based on the range max-min determine the 25% threshold, then: $>mris_calc -o top25pc.mgz someVolume.mgz gte <threshold> --> top25pc.mgz will contain only the voxels in someVolume.mgz with intensities greater than or equal to <threshold>. -=R -- Rudolph Pienaar, M.Eng, D.Eng / email: rudo...@nmr.mgh.harvard.edu MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging 149 (2301) 13th Street, Charlestown, MA 02129 USA
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