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Hi,
Even if the two sites are the same Siemens model, you are going to have difficultly convincing people that any differences you find might not just be a site effect. In my opinion, this falls into the “not possible at all” category.
cheers,
-MH
--
Michael Harms, Ph.D.
-----------------------------------------------------------
Conte Center for the Neuroscience of Mental Disorders
Washington University School of Medicine
Department of Psychiatry, Box 8134
660 South Euclid Ave.
Tel: 314-747-6173
St. Louis, MO 63110
Email: mha...@wustl.edu
From: <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Martin Juneja <mj70...@gmail.com>
Reply-To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> Date: Thursday, September 29, 2016 at 1:54 PM To: Freesurfer support list <freesurfer@nmr.mgh.harvard.edu> Subject: [Freesurfer] Cortical thickness using qdec (between scanners) Hello FS experts,
I have a data set of 20 subjects (patients) collected at location-1 with 3T Siemens scanner. Also, I have a set of age-matched 20 subjects (controls) collected at location-2 with 3T Siemens scanner.
I am interested in comparing cortical thickness between controls and patients using FreeSurfer but I am not sure if I can do that since I have both the data sets collected at two different locations.
I would really appreciate any inputs on this.
I tried to find some papers on scanner differences but all I could find was between 1.5 T vs 3T or 3T vs 7T. Is there any special covariates I need to define for this purpose (if so then at which step during analysis?) or is it not possible at all?
Thanks.
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