Hi, Bump?
Can someone please explain to me the puzzle described below regarding tkregister2 and vox2ras0 (which I thought should be ignored for registration purposes?) Thanks! -- Shay On Sat, May 26, 2012 at 2:23 PM, Shay Ohayon <shay.oha...@gmail.com> wrote: > Hi, > > Here's a question to Doug / anyone else who mastered the intricate way of > volume transformations: > > I'm a bit puzzled. > According to Free surfer's documentation (fscoordinates.pdf), the way two > volumes are registered to each other using tkregister is always using > the fixed transformation (tkvox2ras) (see page 6). > > However, when I do the following little experiment (using matlab's > freesurfer API) > > A = '001.nii'; > B = '002.nii'; > X=MRIread(A); > X.vox2ras0(1,4) = 40; > MRIwrite(X,B); > > tkregister2 --targ 001.nii --mov 002.nii --regheader -reg R.reg > > The two volumes are not in alignment when they are loaded into tkregister. > Now, what am I missing here? > If both were loaded using the fixed transform, they should still be in > alignment (i.e., vox2ras should be ignored for registration purposes). > > Thanks in advance, > > -- Shay > Tsao lab > Caltech > > > > >
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