what is the bandwidth? The typical way to fix it is to increase the bandwidth. You can probably recover some of the SNR you will lose by reducing your flip angle, which is pretty far from the Ernst angle. Also, minimize your TE (if 4ms is not already the min) cheers Bruce
On Tue, 13 Nov 2012, youngmin huh wrote: > Hi, > 3D SPGR sequences were used. (TR=22, TE=4, thickness=1.4, FOV=240*240, > FA=40) > If the artifacts are due to B0 distortion, I wonder how I can fix it. > > Thanks, > Youngmin Huh > > > > 2012/11/12 Bruce Fischl <fis...@nmr.mgh.harvard.edu> > Can you give us the acquisition details? I suspect this is not > noise, but rather B0 distortion. > what is the acquisition? And what bandwidth? > > > On Nov 8, 2012, at 2:53 AM, youngmin huh <ymin1...@gmail.com> > wrote: > > > Dear all, > > > > I'm working with some images, and they have so much noises on > temporal areas. > > I just ran recon2, but not sure if they'll be segmented > properly. > > Does anyone have a recommendation for dealing with it? > > I wonder if there is any flag or option for this occasion. > > I would appreciate any comments or help. > > I attached an example. > > > > Thanks, > > > > Youngmin Huh > > <temporal_001.jpg> > > > 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. > > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
