Hi Susan, if you are not doing a thickness study, then I don't think it will matter much if you have 1 or 2 or 3 T1s. There's not an easy way to compare the recons. You can do a paired difference using 1 T1 vs mult T1s. That will mostly give you bias information, not accuracy or repeatability. doug
On 07/30/2012 01:18 AM, Susan Alice McLaughlin wrote: > Hi Freesurfer experts, > > We’ve been collecting structural (1mm isotropic) and functional > (2.75x2.75x3mm) data on a Philips 3T scanner using an 8-channel head coil. We > are reconstructing each subject’s surface and mapping functional data > processed in FSL’s FEAT to the surface. For some subjects, we have only 1 > MPRAGE, but for others, we have multiple (2 or 3) MPRAGEs, acquired in > separate scanning sessions. > > Looking back at the list serve and FSLwiki > (http://surfer.nmr.mgh.harvard.edu/fswiki/FsQuizAnswers), it appears that our > SNR should be good enough that we do not need -- and perhaps SHOULD NOT use > --multiple MPRAGEs when using recon-all. Is there general agreement on this? > > How does one go about quantitatively comparing one surface reconstruction > derived from 1 MPRAGE to another derived from 2 MPRAGEs? > > Thank you, > > Susan McLaughlin > Doctoral Candidate > SPACE Lab (Stimulus-Parametric Imaging of Auditory Cortex) > Dept. of Speech and Hearing Sciences > University of Washington > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ 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.
