I'm using Myelin_BC as I thought it would be more accurate due to bias correction. I will recalculate with the normal myelin maps.
Can you please tell me why MyelinMaps are better for the stats than MyelinMaps_BC? And do I understand correctly that our acquisition protocol is okay? Thanks a lot! On 14 July 2017 at 02:52, Glasser, Matthew <glass...@wustl.edu> wrote: > Are you using Myelin or MyelinMap_BC? For finding brain areas use > Myelin_BC, for statistics on the myelin itself you will want to use > MyelinMap. > > Peace, > Matt. > > From: <hcp-users-boun...@humanconnectome.org> on behalf of Lisa > Kramarenko <lisa.kramare...@gmail.com> > Date: Thursday, July 13, 2017 at 7:25 AM > To: "hcp-users@humanconnectome.org" <hcp-users@humanconnectome.org> > Subject: Re: [HCP-Users] Calculation of myelin maps > > (just a correction: flip angle 9°, not 90 for MPRAGE) > > On 13 July 2017 at 12:19, Lisa Kramarenko <lisa.kramare...@gmail.com> > wrote: > >> Dear Matt, >> >> I completed all three structural pipelines and performed PALM comparison >> for myelin maps. However, the result I got was somewhat opposed to >> expectations (patients with early MS having significantly stronger >> myelination compared to healthy controls). >> I wondered that maybe something in our acquisition technique could have >> caused an error in the calculation (as they are a bit different from the >> HCP protocol)? I used the following images: >> >> 3D MPRAGE (TR = 1900 ms, TE = 2.55 ms, TI = 900 ms, flip angle = 90 , FOV >> = 240 x 240 mm2 , matrix size = 240 x 240, 176 slices, slice thickness = 1 >> mm), no fat suppression >> T2 SPACE (same matrix, FOV, and number of slices as in the T1w, >> TR=5000ms, TE= 393ms, flip angle = 120, slice thickness = 1mm), no fat >> suppression >> >> Is there anything that would have cause imprecise calculation of myelin >> maps or is it just how our results are? >> >> Thanks a lot!! >> >> Lisa >> > > _______________________________________________ > HCP-Users mailing list > HCP-Users@humanconnectome.org > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
