Thanks Andreas!
I find that doing registration at the same stage as the unwarping allows you to get a better assessment of how successful the latter was.
On a related note, I found that I get a better registration to my highres t1-weighted image with a diffusion-weighted image than the non-diffusion (b0) image. I found this out by accident the first time I ran feat using the whole 4d dti data file, which automatically chose the middle image as the example func.
Could this be because the DWI is closer in contrast with the T1 than the non-DWI?
Cheers,
Pete
On Apr 19, 2012, at 5:47 PM, Andreas Bartsch wrote:
> Hi Pete,
>
> this is good!
> Cheers,
> Andreas
>
> PS: You don't really need 2.c, do you?
>
> Am 19.04.12 15:38 schrieb "Peter Fried" unter <[log in to unmask]>:
>
>> Hi FSL Community,
>>
>> Can someone confirm the appropriate order of pre-processing steps for DTI
>> data?
>>
>> Specifically, does it matter whether the unwrapping (using the pre-stats
>> option in FEAT) occurs before or after the eddy_correction?
>>
>> Here is what I have been doing and I just want to make sure it's correct:
>>
>> #1. Eddy Correction
>> #2. Feat Pre-stats
>> a. Unwarp
>> b. bet
>> c. Registration
>> #3. dtifit
>> #4. bedpostx
>>
>> Thanks!
>>
>> Cheers,
>> Pete Fried
>>
>> Department of Anatomy & Neurobiology
>> Boston University School of Medicine
|