Hello experts,
I am interested in assessing the absolute number of tracts generated
from a given seed ROI, and comparing that number between my patient and
control groups. Why? I want to know whether my tractography results
represent an anatomically-isolated change in tract number, or merely
the area of largest change in tract number. Probtrackx generates a file
that might be used in this manner, the waytotal. From the FSL page for
probtrackx: "waytotal - a text file containing a single number
corresponding to the total number of generated tracts that have not
been rejected by inclusion/exclusion mask criteria."
Have any of you tried to use the waytotal in this manner?
One interesting/confounding thing I've found so far: when I correct the
waytotal number by the volume of the native-space ROI used to seed
probtrackx, all subjects correct to almost exactly the same number (625
+/- 0.1). This would lead me to believe that the total number of tracts
generated by a voxel is always the same, regardless of subject
characteristics. Is this right? I have done the same waytotal and ROI
correction for over 40 regions and always come up with this same number,
625.
Thank you for any insight you can provide.
- Jeff
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.
|