Re: [Freesurfer] Difference in hippocampal volume between scanners

Hi Jessica,

what were the coils? Certainly you will find substantial differences comparing across both field strength and receive coil. Did the segmentations look reasonable? Was it the same sequence?

Bruce

On Thu, 23 Jun 2011, Jessica Liu wrote:

Hi everyone!

I'm currently a summer student working at a lab which uses Freesurfer to measure hippocampal volumes.  I noticed that scanning the same patient first on a GE 3T (Multi-channel head coil) and then a GE 1.5T (single-channel head coil) 24 hours later resulted in a 30% increase in the left hippocampus volume and a 18% increase for the right hippocampus based on the values in aseg.stats.  Can anyone please comment on this and explain the large discrepancies?  Thanks!

Jessica Liu