[Mristudio-users] Theory_Air

[susumu mori]

Thank you for the report. We'll look into the issue.

On Thu, May 26, 2011 at 4:57 AM, Castaneda, Salvador
<salvador.castaneda at med.uni-tuebingen.de> wrote:
> 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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