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 <fis...@nmr.mgh.harvard.edu> wrote: From: Bruce Fischl <fis...@nmr.mgh.harvard.edu> Subject: Re: [Freesurfer] Small voxel size To: "Tricia Merkley" <tmerkl...@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 <fis...@nmr.mgh.harvard.edu> wrote: > > From: Bruce Fischl <fis...@nmr.mgh.harvard.edu> > Subject: Re: [Freesurfer] Small voxel size > To: "Tricia Merkley" <tmerkl...@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 <tmerkl...@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 > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > -----Inline Attachment Follows----- > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > > The information in this e-mail is intended only for the person to whom it is > addressed. If you believe this e-mail was sent to you in error and the e-mail > contains patient information, please contact the Partners Compliance HelpLine > at > http://www.partners.org/complianceline . If the e-mail was sent to you in > error > but does not contain patient information, please contact the sender and > properly > dispose of the e-mail. > > > >
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