Dear FreeSurfer experts,
I had sent several times this email since the last few months, and never
obtained any reply. Would anyone be able to provide me little bit of insight
please?
I am analyzing a dataset (Q-Ball) of subjects with TRACULA on FreeSurfer 6.0.
b1=0, b2=3000 s/mm2 and diff directions = 90.
Surprisingly the trac-all reconstruction with doeddy =1 was not as good as
with doeddy = 0 on average on all the subjects, as in our dataset there were
more tracts missing with doeddy=1 among all the subjects, which is a very
curious result, shouldn't we get the reverse?
==> should I rely more on the doeddy=0 result then?
==> or should I modify the configuration parameters, such as adding more
control points , ... and maybe others?
Secondly, we are using the head motion parameters (computed with doeddy=1) to
exclude subjects who moved too much. Is that appropriate? In other words, can
we trust the motion parameters and exclude subjects on that basis?
Thank you for your time and consideration,
Sincerely,
Loïc Daumail
Graduate Intern at Athinoula A. Martinos Center for Biomedical Imaging MGH/HST
________________________________
From: Daumail, Loic Jean
Sent: Thursday, July 12, 2018 4:50 PM
To: freesurfer@nmr.mgh.harvard.edu
Cc: gdesb...@nmr.mgh.harvard.edu
Subject: questions about Tracula and doeddy=1 or 0
Dear FreeSurfer experts,
I am analyzing a dataset (Q-Ball) of subjects with TRACULA on FreeSurfer 6.0.
b1=0, b2=3000 s/mm2 and diff directions = 90.
Surprisingly the trac-all reconstruction with doeddy =1 was not as good as
with doeddy = 0 on average on all the subjects, as in our dataset there were
more tracts missing with doeddy=1 among all the subjects, which is a very
curious result, shouldn't we get the reverse?
==> should I rely more on the doeddy=0 result then?
==> or should I modify the configuration parameters, such as adding more
control points , ... and maybe others?
Secondly, we are using the head motion parameters (computed with doeddy=1) to
exclude subjects who moved too much. Is that appropriate? In other words, can
we trust the motion parameters and exclude subjects on that basis?
Thank you for your time and consideration,
Sincerely,
Loic
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