1) The overall mean of each scan is 10000, this is not done voxelwise (e.g. like a bias correction would be).
2) Unfortunately this information is not saved. I don¹t think fslmaths outputs it, perhaps it could be back computed from some intermediate files. Peace, Matt. On 4/11/18, 2:21 PM, "hcp-users-boun...@humanconnectome.org on behalf of erik lee" <hcp-users-boun...@humanconnectome.org on behalf of erik.lee...@gmail.com> wrote: >Dear HCP Experts, > >I am currently using the temporally preprocessed rfMRI data in the S900 >release (aka rfMRI_REST?_??_Atlas_hp2000_clean.dtseries.nii). > >According to the Smith 2013 NeuroImage paper, it sounds like the images I >am using have all received global intensity normalization prior to the >temporal preprocessing. > >I have two sets of questions relating to this: > >(1) Does this mean that the global mean of all voxels (averaged across >time points) is used to normalize each voxel? If this is the case, is >this the mean of every voxel in the image, or exclusively those in the >brain? > >(2) Looking through ConnectomeDB, I couldn¹t find a file with the scaling >factor used for normalizing. Is this something that is saved anywhere? > >Thanks for the help! > >Best, >Erik Lee >_______________________________________________ >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
