Hi Lulu - We actually have an automated method to do this. You can read about it in our paper:
http://www.frontiersin.org/Neuroinformatics/10.3389/fninf.2011.00023/abstract

And you can learn how to use it here:
http://surfer.nmr.mgh.harvard.edu/fswiki/Tracula

If you wanted to do this manually, you wouldn't draw ROIs at the endings of the tracts, but deeper in the white matter. This is one paper on this: http://www.ncbi.nlm.nih.gov/pubmed/17481925

Hope this helps,
a.y

On Sat, 12 Oct 2013, lujiao luo wrote:

Dear experts,
 
I was trying to define the ILF(inferior longtitudinal fasciculus),
IFOF(inferori fronto-occipital fasciculus), arcuate fasciculus, and corpus
callosum (CC). But I am not very familiar with the structure of the cortex.
So I am considering that if I can segment some roi files from freesurfer
aseg+aparc.annot file and changing them into .nii.gz file, Then use these
rois as the seed of fiber tracking.   Would you mind teaching  me which rois
I choose for each fiber tract if this way is possible?
 
Another question is about the meaing of labels with a wm- begining (e.g.
wm-lh-G_frontal_superior) in the look-up table. Does it represent the white
matter within the lh-G_ frontal_ superior or represent all white matter that
passed through lh-G_frontal_superior?
 
Thanks so much for your concern.
 
 
Yours,
Lulu

The information in this e-mail is intended only for the person to whom it is
addressed. If you believe this e-mail was sent to you in error and the e-mail
contains patient information, please contact the Partners Compliance HelpLine at
http://www.partners.org/complianceline . If the e-mail was sent to you in error
but does not contain patient information, please contact the sender and properly
dispose of the e-mail.