AFNI program: 3dFWHM

Program: 3dFWHM 
Author:  B. Douglas Ward 
Initial Release:  20 February 1997 
Latest Revision:  08 March 2004 

This program estimates the Filter Width Half Maximum (FWHM).  

Usage: 
3dFWHM 
-dset file         file = name of input AFNI 3d dataset  
[-mask mname]      mname = filename of 3d mask dataset   
[-quiet]           suppress screen output                
[-out file]        file = name of output file            

INPUT DATASET NAMES
-------------------
This program accepts datasets that are modified on input according to the
following schemes:
  'r1+orig[3..5]'                                    {sub-brick selector}
  'r1+orig<100.200>'                                 {sub-range selector}
  'r1+orig[3..5]<100..200>'                          {both selectors}
  '3dcalc( -a r1+orig -b r2+orig -expr 0.5*(a+b) )'  {calculation}
For the gruesome details, see the output of 'afni -help'.