6 dof maybe be good but it assumes that there are no eddy currents
involved and that the B0 volumes can be registered by a rigid body
Am 20.04.12 17:20 schrieb "Stamatios Sotiropoulos" unter
<[log in to unmask]>:
>correct, apart from the SNR gain. It is sqrt(N), so in your case sqrt(6).
>----- Original Message -----
>From: "Cunningham, Dustin" <[log in to unmask]>
>To: <[log in to unmask]>
>Sent: Friday, April 20, 2012 4:07 PM
>Subject: [FSL] b=0 averaging
>If I have say 6 b=0 images and I want to average them I would simply
>coregister them (6 dof) then add and divide by 6, correct?
>...and this will give me a 6*sqrt(2) increase in SNR?
>Just want to make sure Im not missing anything.
>From: FSL - FMRIB's Software Library [[log in to unmask]] On Behalf Of
>Andreas Bartsch [[log in to unmask]]
>Sent: Thursday, April 19, 2012 5:47 PM
>To: [log in to unmask]
>Subject: Re: [FSL] DTI: Order of Eddy_correction vs. Unwarping
>this is good!
>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
>>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
>>Department of Anatomy & Neurobiology
>>Boston University School of Medicine