[Mristudio-users] AIR/MI/theory AIR, which is the best?

[Lisa Marie Langevin]

Dear Dr. Mori,

I have been using your atlas to identify and trace the SLF on my pediatric DTI data.  I am interested in now subdividing the SLF into it's component parts, but from the literature, it seems as though the ROIs and tract images don't include the dorsomedial portion of the SLF, known as SLF I.  SLF II and III figure prominently, however.

According to the atlas, the region where the SLF I is usually found has been denoted as superior frontal gyrus white matter (SFG-WM) and superior parietal gyrus white matter (SPL-WM).

Is this the most recent terminology?

This link to a recent Nature article better illustrates the region I am trying to identify.

http://www.nature.com/neuro/journal/v14/n10/fig_tab/nn.2905_F1.html

Thank you!

Lisa Marie Langevin






Lisa Marie Langevin, PhD.
Postdoctoral Research Fellow
Behavioural Research Unit
Alberta Children's Hospital Research Institute for Child and Maternal Health
Tel: (403) 955-2785, Fax: (403) 955-2772
Email: lisamarie.langevin at albertahealthservices.ca
________________________________________
From: mristudio-users-bounces at mristudio.org [mristudio-users-bounces at mristudio.org] On Behalf Of susumu mori [susumu at mri.jhu.edu]
Sent: August 11, 2011 5:46 PM
To: DTI Studio, ROI Editor, DiffeoMap Questions/Support
Subject: Re: [Mristudio-users] AIR/MI/theory AIR, which is the best?

If the scans are not co-registered (the subject went out and came back to the scanner), I suggest you to calculate the tensor first and register the tensor using DiffeoMap and linear registration (AIR or MI).

If you register the raw DWI data, you may get a bit better SNR (this is my guess), but you have to make sure to use the b-table re-orientation scheme in the AIR. I would recommend to use AIR or MI (MI may take a lot of time), although I don't have much experience in the cross-scan registration.

I think the first method (calculate tensor and then register) is the easiest.


On Thu, Aug 11, 2011 at 6:35 PM, Min Liu <mliu4 at ualberta.ca<mailto:mliu4 at ualberta.ca>> wrote:


Dear MRIStudio users,

I have four human brain datasets that are scanned sequentially (back
to back) of a single subject using the same DTI protocol. I want to
get an averaged dataset out of the four. Before doing that,
motion/eddy current correction is definitely needed. I am wondering
among the three methods provided by DTIStudio, i.e. AIR/MI?theory AIR.
By visual inspection, there is rotation/shifting between the very
first dataset and the very last by about 2 voxels. For this subtle
movement, is there a conclusion so far regarding which coregistration
is the best (without introducing errors! Sometimes AIR does more harm
than good by misalignment.) Thank you for your thoughts!!

Min
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