Hi Jason
try specifying --regheader so tkregister2 will compute the registration from the vox2ras of the two scans.
cheers Bruce On Fri, 4 Feb 2011, Jason Webster wrote:
I couldn't get either of the built-in functions to work to check the registration between two volumes which should have been the same. I also noticed that the tkregister2 wiki pagehttp://surfer.nmr.mgh.harvard.edu/fswiki/tkregister2contains no info about the command, though it does have a link to the TkRegister2 Guide http://surfer.nmr.mgh.harvard.edu/fswiki/TkRegister2Guide, which does not exist.
FREESURFER_HOME: /Applications/freesurfer
Build stamp: freesurfer-Darwin-leopard-i686-stable-pub-v5.0.0
Kernel info: Darwin 10.6.0 i386
swi> tkregister2 --targ SWI1.nii.gz --mov SWI2.nii --identity tkregister_tcl /Applications/freesurfer/lib/tcl/tkregister2.tcl ERROR: no registration file specified
swi> tkregister2 --targ SWI1.nii.gz --mov nsLGH_26Aug10_10.nii --check-reg tkregister_tcl /Applications/freesurfer/lib/tcl/tkregister2.tcl target volume SWI1.nii.gz movable volume SWI2.nii reg file /tmp/reg.tmp.1297311621.dat LoadVol 1 ZeroCRAS 0 $Id: tkregister2.c,v 1.117.2.1 2010/08/02 17:42:03 greve Exp $ Diagnostic Level -1 regio_read_register(): No such file or directory Could not open /tmp/reg.tmp.1297311621.dat ERROR: reading /tmp/reg.tmp.1297311621.dat