vbsim

From VoxBoWiki

vbsim is a very simple program to generate 3D and 4D volumes with some known characteristics. It may be useful for some kinds of testing and validation.

Here's the help text:

VoxBo vbsim (v1.8.5pre8/May  6 2010)
usage: vbsim [flags] file
flags:
  -d <x> <y> <z> <t>    set dimensions
  -a <u> <v> <fwhm>     anatomy mean, variance, and smoothness
  -c <vol>              anatomy file
  -n <u> <v> <fwhm>     noise mean,variance,and smoothness
  -z <x> <y> <z> <t>    set voxel sizes (t is usually TR in ms)
  -o <filename>         output filename (default \"data.tes\"
  -h                    help
  -v                    version
notes:
  FWHM is in voxels (data don't even have voxel sizes)

  using -c and -a is additive

  noise defaults to 10,5,1 if -n isn't specified

  If y, z, and t dimensions are 0, a 1D vector file is created.  If
  just t is 0, a 3D volume is created.  In the former case, the fwhm
  is ignored, but you still have to provide it.