That turning angle is Cos (0.2) =~80
degrees is already very liberal. Is there evidence from the diffusion
lines that the fibers are making an even sharper turn than that? Also,
what is the rational behind using the tractography ILF result as a waypoint,
rather than just tracking between the two cortical areas?
Peace,
Matt.
From: FSL - FMRIB's
Software Library [mailto:[log in to unmask]] On
Behalf Of Markus Gschwind
Sent: Sunday, December 07, 2008
1:55 PM
To: [log in to unmask]
Subject: Re: [FSL] AW: [FSL]
fdt_path intersection vs connectivity
Hi Andreas and Matt,
Yes, that is a good idea! Maybe I should play with the turning angle. I left it
at default (I think it is 0.2).
I am trying to analyse the relationships between several occipito-temporal
areas, intra- and interhemispherically. The main tracts will be ILF, in the
sense of a core and there will be connections in U fiber shape from the
different cortical areas to the other, passing via ILF. So I tried to first
isolate the ILF, which comes out rather easily, then threshold it very high,
like at 1000 and use this core as a waypoint between the cortical areas in
question. But with no result.
However when seeding without waypoint I see that most paths go to the area of
ILF and they have large intersections there.
Best, and thank you!
Markus
2008/12/5 Matt Glasser <[log in to unmask]>
What pathway are you trying to track?
Peace,
Matt.
-----Original Message-----
From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
Of Andreas Bartsch
Sent: Friday, December 05, 2008 1:15 PM
To: [log in to unmask]
Subject: [FSL] AW: [FSL] fdt_path intersection vs connectivity
Hi Markus,
may the turning angle?
Cheers-
Andreas
________________________________
Von: FSL - FMRIB's Software Library im Auftrag von Markus Gschwind
Gesendet: Fr 05.12.2008 18:10
An: [log in to unmask]
Betreff: [FSL] fdt_path intersection vs connectivity
Hello!
I have another question regarding the interpretation of the intersection
between paths.
I have two cortical regions A and B from where the (unrestricted) paths
intersect largely but I cannot obtain a direct connectivity (seed A,
waypoint mask B).
If do a tracking from the intersection I have connectivities to both regions
A and B.
How would I interprete this?
Thank you for comments!
Markus
--
Dr. med. Markus Gschwind, M.D.
Laboratory for Neurology and Imaging of Cognition
Dept of Neurosciences
1 Michel-Servet - 1211
Tel 0041 (0) 22 379 5324
Fax 0041 (0) 22 379 5402
email: [log in to unmask]
http://labnic.unige.ch