Do you get samples that make it to the other mask when tracking singly?
Peace,
Matt.
On 2/18/13 3:34 PM, "Katherine Bryant" <[log in to unmask]> wrote:
>Hello,
>
>I'm currently trying to run symmetric tracking between two fairly large
>cortical masks in a macaque scan, and I'm running into problems - I'm
>getting no result, the waypoint file says 0,0, and the fdt.paths file
>shows no result.
>
>I've run the same analysis successfully many times in our chimpanzee
>scans.
>
>I have tried to isolate the problem by testing other tractography runs -
>I'm able to successfully get tracking from single subcortical (amygdala)
>or single cortical (V1, for example) masks. However, when those same
>cortical masks which work singly are both used for a symmetric run, no
>dice. I've also tried extending our cortical masks well into the white
>matter, to the point where they overlap tracking from single-mask runs -
>suggesting that loss of signal near the gray matter boundary isn't the
>problem.
>
>The resolution on the T1s is .5 mm^3 and for the DTIs is 1.1 mm^3.
>
>Has anybody run into this before and do they have any suggestions?
>
>Thanks for your time,
>Katherine
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