Hi, how are you,
I am unable to generate tracts from two seed masks drawn from
structural and diffusion space and would appreciate your kind advice.
I have previously been able to generate tracts from two seed masks on the
diffusion space and am now trying to regerate them by using the ones from
structural and standard space.
I derived the transformation matrix using FLIRT using TI/ standard as my
reference and the 3D volume B0 as my input the respective inverted matrix
are plugged into the "transformation matrix" when i ran probtrack. (i.e for
roi masks drawn on structural space, the inverted matrix "structodif.mat" is
vice versa for standard space. However I'm puzzled why no tracts were
generated as the seed masks are in close proximity to each other and are
quite large in size.
Having read the email list, i then use FLIRT and perform registration again
using the bedpost directory (instead of the B0) and the structural TI (or
standard), but the error message said it cannot open my bedpost directory.
Did the problem lie in the registration matrix which may have explain why
there is no tracts generated and also why i couldn't register the whole
bedpost directory to the TI/ standard image? Is there a problem with my
bedpost directory resulting in no xfm matrix generated from FLIRT when i use
the whole directory instead of B0.
thanks
regards,
Siewmin
|