[Mristudio-users] Reference for AIR in DTI Studio

[susumu mori]

Cross-contrast image registration is always difficult. This applies for
regular intra-data DTI image registration in which DWIs are registered to
b0. If you have aDWI, the contrasts between two images will be much closer
and co-registration may work better, but in theory, you can not correct the
eddy current for which b0 is used as the non-distorted reference, although
modern scanners should not have much eddy current distortion anymore.

Another issue you need to worry is that aDWI may contain motion-caused
mis-registration in it. Then aDWI may not be a good reference.

If you haven't read DtiStudioUpdate.doc in
https://www.mristudio.org/wiki/changelog/dtistudio-3.0.2, please study it,
although it doesn't completely answer your question.

On Mon, Apr 26, 2010 at 10:37 PM, [Seongjin] <choisj70 at gmail.com> wrote:

> Using a fixed noise level, I tried two reference images for AIR.
> This was done only for intra-individual registration not for spatial
> normalization.
> Because I did not want to wash out individual difference.
>
> 1. b=0 image
>
> 2. aDWI (generated using DTI studio, average of all raw DWIs)
>
> Test results for some data sets, AIR results from 2 visually appeared to be
> better, i.e. less motion.
>
> Is there any better suggestion for reference image for AIR in DTI studio?
>
> -SC
>
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