It's hard to know without the info about scanner type (Manufacturer/Field/Sequence) and FreeSurfer version.
I usually see 3-5% difference in measurements. Phillips 3T with common fSPGR. ---------------------------------------------------------- Pedro Paulo de M. Oliveira Junior Diretor de Operações Netfilter & SpeedComm Telecom -- For mobile: http://www.netfilter.com.br/mobile
On Thu, Jun 10, 2010 at 12:03, blazey@artsci.wustl.edu wrote:
Hi All,
Our group recently scanned subjects with two different scanners in order to determine how reliable FreeSurfer comparisons between the two scanners are. After putting each session through the regular cross-sectional Freesurfer pipeline, we noticed that there is much greater variability between the two scanners when we compare structures in the right hemisphere than in the left. Is there any FreeSurfer related reason for this?
Also, we are currently running each subject through the longitudinal pipeline (i.e. Scanner 1 as TP1, Scanner 2 as TP2). Is there any reason to think that this will help reduce the variability seen between the two scanners?
Thanks in advance for any help.
- Tyler Blazey
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