Dear Freesurfer: I have some problems with using mri_surf2vol .I'd like to ask if you could help me with this.--volreg Contains the matrix that maps XYZ in the reference anatomical to XYZ in the functional volume. And to get this reg I use bbregister. But the result of bbregister is functional to anatomial volume,so I need to inverse the matrix.When I use convert_xfm in fsl I found the register.dat(which is the reslut of bbregister)is not a 4*4 matrix ,it just like dsub1 1.000000 1.000000 0.150000 9.999998807907104e-01 3.475215926300734e-04 3.422866575419903e-04 1.634627580642700e-02 -3.475832345429808e-04 9.999999403953552e-01 1.798802986741066e-04 -4.015868902206421e-02 -3.422244917601347e-04 -1.799785532057285e-04 1.000000000000000e+00 -2.181045338511467e-02 0 0 0 1 round Is there a command I can use to inverse the register.dat?Or if I use convert_xfm which part of the register.dat should I use? Thank you !
Yours Dongbo Liu