[Mristudio-users] temporal lobe tracts

[susumu]

Hi Siewmin,
 
Please make sure that you correctly set the "flip" options. If you are using
Siemens and the manufacturer-provided gradient table, the chance is high
that you have to "X-flip" before fiber tracking. If you are using Philips,
then "Z-flip".
 
Please place an ROI in the mid-sagittal corpus callosum and make sure that
you get the correct shape of the corpus callosum. If not, you could be
setting the "flip" in a wrong way.
 
There is a detailed description about the "flip" function in the DtiStudio
manual.
 
Susumu

  _____  

From: mristudio-users-bounces at mristudio.org
[mailto:mristudio-users-bounces at mristudio.org] On Behalf Of Siewmin Gan
Sent: Saturday, February 21, 2009 8:23 AM
To: mristudio-users at mristudio.org
Subject: [Mristudio-users] temporal lobe tracts


Dear all, 
            I am trying to reproduce some tracts associated with the
temporal lobe using the ROI drawing protocols from the paper
"Reproducibility of Quantitative Tractography Methods Applied to Cerebral
White Matter". The acquisitions of the DTI are similiar to the paper. I had
good results with the ILF, but couldn't get the uncinate fasciculus and
cingulum in controls and patients data. For these tracts, after I draw the
1st ROI with the "Or" function, I couldn't see tracts in the specified
area/slice mentioned in the protocol to place the 2nd ROI.

 I wonder if I have misinterpreted the protocols. Secondly, the dti slices
were acquired parallel to the AC-PC line in the paper and the protocols are
based on anatomical landmarks. If the dti data I tried on are not acquired
exactly parallel to the AC-PC line, would it make a difference in the
reproducibility using the protocol? Much appreciated if any of you have
tried and could derive these two tracts.

Many Thanks

Siewmin
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