[Mristudio-users] Questions about frames

[Ichord, Rebecca]

Dear Sirs,
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thx,

Rebecca Ichord MD
Associate Professor, Neurology
University of Pennsylvania School of Medicine
Director, Pediatric Stroke Program
Dept. Neurology, CTRB 10th Floor
Children's Hospital of Philadelphia
3501 Civic Ctr Blvd
Philadelphia, PA 19104
Ph. 215-590-4142 Fax 215-590-5120
email: ichord at emailchop.edu

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From: mristudio-users-bounces at mristudio.org [mristudio-users-bounces at mristudio.org] On Behalf Of Hangyi Jiang [hjiang at jhmi.edu]
Sent: Wednesday, October 27, 2010 10:58 AM
To: DTI Studio, ROI Editor,     DiffeoMap Questions/Support
Subject: Re: [Mristudio-users] Questions about frames

the results are based on image frame. in the end, we are doing image analyze, which is based the images in our hand.  :)

hangyi






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From: mristudio-users-bounces at mristudio.org [mristudio-users-bounces at mristudio.org] On Behalf Of Xu Li [xuli at mri.jhu.edu]
Sent: Wednesday, October 27, 2010 10:44 AM
To: DTI Studio, ROI Editor,     DiffeoMap Questions/Support
Subject: [Mristudio-users] Questions about frames

Dear Susumu and Hangyi,

I have one quick questions about the eigenvectors we can get from DTI-Studio. Are they defined in the image frame or the lab frame? I understand that the gradient is applied according to the image frame but the correct gradient table should be defined in lab frame (i.e. if we acquire 0 angulation data, the very first gradient vector would be [0 0 1] or some thing like that).  But after we do the tensor fitting and eigenvalue decomposition, are they still in lab frame? I guess it is, but just want to confirm.

Thanks!

Xu
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