Hi Susan unfortunately there is no way to say which one is better except (a) visual inspection, and (b) comparison to previous results, which probably won't be terribly powerful. You can look at the reliability of the surfaces by comparing thickness in the N=1 and N=2 recons. With 8 channels I'm not sure, it depends a lot on coil geometry. We've had trouble with some 8 channel coils in the past due primarily to poor SNR near the top of the brain (the vertex)
cheers Bruce On Sun, 29 Jul 2012, 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 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.
