Thanks for the answer, Bruce.

Best, Cícero.

2012/3/21 Bruce Fischl fischl@nmr.mgh.harvard.edu

Hi Cícero

there's no easy answer for this question. If one of them is seriously motion corrected you are probably better off only using the other, but it depends on what coil you used, what field strength, voxel res, etc.... Basically if one has sufficient CNR than it can be better than two, particularly if the 2nd is corrupted. In general we don't require 2 images

cheers Bruce

On Wed, 21 Mar 2012, Cícero Nardini Querido wrote:

Hi everyone,

...

I am going to use FreeSurfer to analyze cortical thickness in some structural images. In order to generate the individual output, Freesurfer asks for 2 different input images. If I have two acquisitions from the same subject, but they present different degrees of quality (such as movement index), would it be better to use just one of them? Is there any problem in doing that? Also, is there a reliable index to assess the images level of movement before I use them on FreeSurfer?

Thanks for that!

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