[Mristudio-users] Reference for AIR in DTI Studio

[Seongjin]

Thanks for your reply to my question.

-SC

On Tue, Apr 27, 2010 at 9:35 AM, susumu mori <susumu at mri.jhu.edu> wrote:

> 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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