Yes, this is data of the lab I am in. I assume that I don't have fat saturation as I have never heard about it before... If I understand correctly it can't be done post-hoc after acquisition and should have been done during scanning? Other patients from the same batch (acquired the same way) don't have this problem. What would be the way to fix the surfaces manually?
Thanks a lot! On 30 May 2017 at 15:42, Glasser, Matthew <[email protected]> wrote: > Are these of your own data? Do you have fat sat on in your T1w? This > looks like most likely surface errors because of not using fat sat and you > would need to exclude these subjects or fix the surfaces manually. > > Peace, > > Matt. > > From: Lisa Kramarenko <[email protected]> > Date: Tuesday, May 30, 2017 at 7:53 AM > To: Matt Glasser <[email protected]> > Cc: "[email protected]" <[email protected]> > Subject: Re: [HCP-Users] values in myelin maps > > Thanks! > Another question I have concerning myelin maps is the following: when I > was doing quality control I noticed that some of them look rather weird > (see screenshot). Why are some areas grey? And I presume the fact that the > values in this grey area are negative, indicates that something is wrong... > And are the black parts normal (they still have positive values)? Do you > have an idea of what to do? > > Thanks a lot! > > Lisa > > On 29 May 2017 at 15:55, Glasser, Matthew <[email protected]> wrote: > >> They are the ratio of the T1w/T2w images and are a relative measure of >> myelin content. See this publication for more details: >> >> http://www.jneurosci.org/content/31/32/11597.short >> >> Peace, >> >> Matt. >> >> From: <[email protected]> on behalf of Lisa >> Kramarenko <[email protected]> >> Date: Monday, May 29, 2017 at 5:29 AM >> To: "[email protected]" <[email protected]> >> Subject: [HCP-Users] values in myelin maps >> >> Hello, >> >> I am not sure what exactly are the values shown for the myelin maps. E.g. >> on the screenshot the values are 0.998 to 1.771. I understand that higher >> values mean higher myelination and vice versa, but what do they mean >> exactly? >> Thanks! >> >> Lisa >> >> _______________________________________________ >> HCP-Users mailing list >> [email protected] >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> > > _______________________________________________ HCP-Users mailing list [email protected] http://lists.humanconnectome.org/mailman/listinfo/hcp-users
