Thanks Markus!!
Markus Gschwind dijo:
> Hi!
>
> Look here:
>
>
> ----- Message transféré de [log in to unmask] -----
> Date : Sun, 20 Jan 2008 14:42:57 -0500
> De : Matt Glasser <[log in to unmask]>
> Répondre à : FSL - FMRIB's Software Library <[log in to unmask]>
> Objet : Re: [FSL] DTI-- mean of two runs
> À : [log in to unmask]
>
> The mean will have better SNR than the individual scans. You could do
> something like this to motion correct your data and get the mean:
> fslmerge -t big4d <data1> <data2>
> eddy_correct big4d big4d_corr 0
> fslroi big4d_corr av1_corr 0 <# of volumes in a single average>
> fslroi big4d_corr av2_corr <# of volumes in a single average> <# of
> volumes
> in a single average>
> fslmaths av1_corr -add av2_corr -div 2 <data>
>
> These commands merge the two averages into a single file for motion
> correction, then split out the motion corrected averages, and then get the
> mean.
>
> Peace,
>
> Matt.
> -----Original Message-----
> From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On Behalf
> Of Jiansong Xu
> Sent: Sunday, January 20, 2008 2:31 PM
> To: [log in to unmask]
> Subject: [FSL] DTI-- mean of two runs
>
> Dear Friends:
>
> I'm using FSL (FDT) to analyze DTI data acquired with a Simens Trio 3
> T scanner. Each subject had two scans with same parameters. My
> question is: is the mean image of the two scans better than either
> one of the two scans? If so, how to get the mean of the two images?
>
> Best
>
> Jiansong
>
>
> ----- Fin du message transféré -----
>
>
>
>
> Quoting Diana Tordesillas <[log in to unmask]>:
>
>> Dear FSL experts,
>>
>> I have 2 DTI adquisitions from the same subject-same session that would
>> like
>> to average. It is not clear to me if I should (and how) average before
>> FDT
>> or once I have processed both images. I am quite new to DTI processing
>> and
>> still playing around with FSL's tools for DTI.
>>
>> Thank you ,
>>
>> Diana
>>
>
>
>
> --
>
> Dr. med. Markus Gschwind, M.D.
> Laboratory for Neurology and Imaging of Cognition
> Dept of Neurosciences
> University Medical Center (CMU)
> 1 Michel-Servet - 1211 GENEVA - CH
>
> Tel 0041 (0) 22 379 5324
> Fax 0041 (0) 22 379 5402
> email: [log in to unmask]
> http://labnic.unige.ch
>
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