[Mristudio-users] Theory_Air

[Castaneda, Salvador]

Hey jacquie,

I had the exact same issue when i started using it. What i did was export the all the maps i was measuring (FA, RD, ADC..) as analyze files. Then i used another software, in my case Pmod, and then uploaded all the files. The files have the same header and so they are already coregistered, you only have to ( i prefer) manually coregister them to an anatomy. Then i drew the rois there. ROI editor from the dti studio software is also good, but i found it hard to coregister the anatomy there. I think i'm not properly qualified to give you an answer about the tracts, so i leave it to someone else to answer that, but i would first look at the shimming you are performing on the region you are studying, and then i would guess there is going to be variability in the tracts that should average out with many samples, i think the averages should only help... Maybe the seeding of the tracts?
Best,

Salvador
----------------------------------------------------------------------------------- 
Salvador Castaneda, MD.
University of Tübingen - Department of Radiology
Röntgenweg 13
72076 Tübingen
Germany
 
Office:      +49 (7071) 29-82977
Fax:          +49 (7071) 29-4451
E-mail:     Salvador.Castaneda at med.uni.tuebingen.de
Web:         www.preclinicalimaging.org 


-----Ursprüngliche Nachricht-----
Von: mristudio-users-bounces at mristudio.org [mailto:mristudio-users-bounces at mristudio.org] Im Auftrag von Jacquie Hodge
Gesendet: Mittwoch, 25. Mai 2011 22:21
An: mristudio-users at mristudio.org
Betreff: [Mristudio-users] Theory_Air

Hi everyone,

I receive my DTI images as 6 directions with 6 repeats. Today I tried the Theory_Air registration on a set that I have already done many analysis on and I found that although the fiber statistics stayed generally similar when doing tractography, the FA values were quite different for the tracts.. From an average of 0.55 to 0.41 when I did the Theory_Air.
Can someone explain why for me? Should I not be using this with 6 repeats?
What I really would like to do is co-register one of my nice anatomical images with the FA or color FA for more accurate placement of my ROI's.

Thanks,

Jacquie

Jacquie Hodge MSc candidate in Neuroscience, BSc
Neuroscience, University of Calgary
Research Assistant, Calgary Pediatric Stroke Program
Alberta Children's Hospital
2888 Shaganappi Trail NW, Calgary, AB, Canada T3B 6A8
Phone: 403-955-7733 Fax: 403-955-2922
jacquie.hodge at albertahealthservices.ca
Program website: www.perinatalstroke.com

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