Dear Dr Bruce,
Thank you very much for the quick response
mri_average -rms will average the 4 volumes for each MEMPRAGE and output one T1
image. The results is four T1 images.
How can I average these four T1 images. Can I merge them and use mri_average
-rms gain?
-------- Original Message --------
> Subject: Re: [Freesurfer] T1 motion and average
> Local Time: August 15, 2017 6:04 PM
> UTC Time: August 15, 2017 10:04 PM
> From: fis...@nmr.mgh.harvard.edu
> To: John Anderson <john.ande...@protonmail.com>, Freesurfer support list
> <freesurfer@nmr.mgh.harvard.edu>
>
> Hi John
>
> sure, mri_average -rms will take the square root of the sum of squares of
> the 4 echoes if you want. You could then average them across the
> MEMPRAGEs if you want
>
> cheers
> Bruce
> On Tue, 15 Aug 2017, John Anderson wrote:
>
>> Dear Freesurfer experts,
>> I have noisy four MEMPRAGE images each one has four volumes for the same
>> participant. These T1 images were acquired at the same scanning session. I
>> have two question:
>> 1. Is there any tool in free surfer to average these images.
>> 2. Is the average the images a good idea to reduce noise and improve SNR
>> 3. Do you suggest me any solution that can help to reconstruct these noisy
>> images.
>>
>> Thank you for any suggestion
>> John
>>
>>
>
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