Hi Jorge, Thank you very much for your explanation. That's really helpful.
Thank you, Hai On Tue, Jan 7, 2014 at 5:25 AM, Jorge Jovicich <jorge.jovic...@unitn.it>wrote: > Hi Hai, > > I agree with Bruce. In a recent paper (http://www.ncbi.nlm.nih.gov/ > pubmed/23668971), for a variety of 3T vendor and coil configurations, we > confirmed previous findings that averaging two within-session uncorrupted > MPRAGE scans did not significantly improve across session reproducibility. > In you case just choose the best one of the two. > > Is it worth acquiring two MPRAGES then? Tricky. Maybe you can go for only > a single acquistion if your MR operator is experienced to distinguish what > level of artifact will be unacceptable for the target analysis and deserves > a repeated acquisition in case of unacceptable quality. Otherwise, one may > fix two acquisitions in the protocol and use the best of them. > Nevertheless, the operators should always be paying attention to the data > quality during the acquisition to decide if some type of intervention can > help. > > cheers, > jorge > > > On 06/01/2014 21:38, Bruce Fischl wrote: > >> Hi Hai >> >> it really depends on your coil and field strength, and whether either is >> motion-corrupted. For 3T 32 channel data our somewhat ad hoc opinion is >> that one is better than two (due to blurring induced by interpolation), >> but it's really a case-by-case decision. >> >> sorry that there isn't an easier answer >> Bruce >> On Mon, 6 Jan 2014, Hai Pan wrote: >> >> Hello, FreeSurfer experts, >>> >>> We made two T1 scans for each subject at each session, will they be >>> helpful >>> for better recon-all results? Shall I average them and process the >>> averaged >>> T1 image? Let me know please. >>> >>> Thank you, >>> >>> Hai >>> >>> >>> _______________________________________________ >> 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. >> >> > -- > Jorge Jovicich, Ph.D. > > MR Lab Coordinator > Center for Mind Brain Sciences > University of Trento, > Via delle Regole, 101 > 38100 Mattarello (TN) > Italy > > Telephone: +39-0461-28 3064 > Fax: +39-0461-28-3066 > Email: jorge.jovic...@unitn.it > http://www.cimec.unitn.it/ > http://polorovereto.unitn.it/~jovicich > >
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