Freesurfer error FOV > 256

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16

It looks like -cw256 and -hires are mutually exclusive.

From recon-all:

    case "-hires":
      set HiRes = 1;
      set ConformMin = 1;
      echo "INFO: hi-res volumes are conformed to the min voxel size"
      # per testing by Natalia Zaretskaya, Mar 2015, the flags which
      # normally disable the aseg steps are no longer necessary (which
      # means aseg.mgz can be created with hi-res data).
      breaksw

...

  if($ConformMin) then
    set cmd = ($cmd --conform_min)
  else
    set cmd = ($cmd --conform)
    if($DoConformWidth256 || -e $subjdir/tmp/cw256) then
      # force conform width to 256
      set cmd = ($cmd --cw256)
      # see note just below on when -cw256 is necessary (ie, when FOV > 256)
    endif
  endif

So feel free to report it as a bug to the list, but you’re unlikely to find a simple resolution. I think your best options are (a) --no-submm-recon, if you don’t care about using the extra resolution; or (b) cropping your original image to a suitably small FoV.

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