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Hi Dustin, correct, apart from the SNR gain. It is sqrt(N), so in your case sqrt(6). Cheers Stam ----- 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. Dustin ________________________________________ 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 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