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: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Lisa Kramarenko <lisa.kramare...@gmail.com<mailto:lisa.kramare...@gmail.com>> Date: Monday, May 29, 2017 at 5:29 AM To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> 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 HCP-Users@humanconnectome.org<mailto: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