[Mristudio-users] theory - registration

[Julie McEntee]

Hi Susumu,

I was wondering if you have been able to follow-up on your points in the
email to Darren (below).

I read the response re: TheoryAir from Hangyi, but it did not indicate
whether TheoryAir does a regid or affine transform to answer whether or not
it would be able to do eddy current correction-?

I am able to do the Pixel rejection using Darren¹s method and obtain results
with binary mask & no ³Image rejection²; however, I get Image rejection
after performing TheoryAir- is that expected? How do you determine the # of
iterations to perform with TheoryAir?

Lastly, if I want to do TheoryAir and Pixel rejection, would I do TheoryAir,
save DWI + b0 images as REC file, re-load into DtiStudio, and then perform
Pixel rejection/tensor calculation?

Thanks for your help,

Julie

Julie E. McEntee, MA, CCRP
Senior Research Program Coordinator
Department of Psychiatry- Neuroimaging
Johns Hopkins University School of Medicine
600 N. Wolfe St./Phipps 300
Baltimore, MD 21287
Phone: 410-502-0468
Fax: 410-614-3676


On 5/18/10 10:48 AM, "susumu mori" <susumu at mri.jhu.edu> wrote:

> Darren,
> 
> You are using the "Pixel rejection" correctly and we have to investigate why
> you are getting "Image rejection" results.
> 
> 
>> 1) Should I run other registration methods such as AIR or MI before
>> theory-registratin? Will theory-registration take care of eddy current
>> correction?
> 
>> >Theory registration should be used instead of AIR or MI. I have to confirm
>> Hangyi if TheoryAIR does rigid or affine. I'll get back to you with this
>> respect too.
>  
>> 
>> 2) What images are changed by theory registration?  The original
>> images? It doesn't seem to produce new images such as with mutual
>> information or AIR.
> 
>> >Yes, when you use TheoryAIR, you don't get a copy. The original images are
>> overwritten.
>  
>> 
>> Thanks,
>> Darren
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> 
> 
> 
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