OK, thanks so much for letting me know. Any idea how it might affect cortical thickness or subcortical volume results (over-estimation/under-estimation)?
We do try to use the same image acquisition parameters for all subjects in a given study of course, but this was an unusual case...
Thanks, Tricia
--- On Thu, 3/10/11, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote:
From: Bruce Fischl fischl@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Small voxel size To: "Tricia Merkley" tmerkle22@yahoo.com Cc: "freesurfer@nmr.mgh.harvard.edu" freesurfer@nmr.mgh.harvard.edu Date: Thursday, March 10, 2011, 6:37 AM
Hi Tricia,
I don't think you can use that subject. It will only have 39% of the SNR of the others. Sorry :<
Bruce On Wed, 9 Mar 2011, Tricia Merkley wrote:
The native resolution of the other subjects is (1,1,1)mm voxel size and (256,256,160) voxels, whereas this subject is (0.7,0.7,0.8) mm voxel size and (288,288,165) voxels. Sorry that wasn't clear in my previous email. I'd appreciate any insight that anyone might be able to share.
Thanks, Tricia
--- On Wed, 3/9/11, Bruce Fischl fischl@nmr.mgh.harvard.edu wrote:
From: Bruce Fischl fischl@nmr.mgh.harvard.edu Subject: Re: [Freesurfer] Small voxel size To: "Tricia Merkley" tmerkle22@yahoo.com Cc: "freesurfer@nmr.mgh.harvard.edu" freesurfer@nmr.mgh.harvard.edu Date: Wednesday, March 9, 2011, 5:01 PM
What is the resolution of your other subjects?
On Mar 9, 2011, at 5:21 PM, Tricia Merkley tmerkle22@yahoo.com wrote:
Hello,
One of our subjects was scanned with (0.7,0.7,0.8) mm voxel size, although all other acquisition parameters were the same as the other subjects. I'm wondering to what extent this might affect the results of the subcortical segmentation, cortical thickness measurements, etc., as compared to 1mm cubic voxels. When would it be appropriate to use the '-cm' flag for mri_convert?
Thanks, Tricia Merkley
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