Thank you very much Matthew and Timothy for the clarifications.
Regards, Shruti On 27 July 2017 at 02:11, Timothy Coalson <tsc...@mst.edu> wrote: > As some additional explanation, the reason there are multiple files in the > unprocessed data is that we did not acquire all the directions in a single > scan (that would have been excessively long). Instead, they are split > across several scans, which are separate files before preprocessing. The > number of directions in each is deliberately slightly different in order to > make it harder to mix up which one is which. > > Tim > > > On Wed, Jul 26, 2017 at 9:49 AM, Shruti Narasimham <naras...@tcd.ie> > wrote: > >> Dear all, >> >> I am new to the HCP datasets and therefore a bit confused about the DWI >> datasets uploaded. I would be very grateful if you could kindly clarify the >> following: >> >> 1. 3T DWI data has scans with b-values 0,1000,2000,3000 while 7T has >> with 0,1000,2000 ? >> 2. Each subject has multi-shell data (different b-values within the >> same dataset) ? >> 3. The manual says that for the 3T data, 6 files exist for each >> subject corresponding to 3 b-values and 2 phase encoding directions. The >> 3T >> data has subject_name_dir95_AP, subject_name_dir96_AP, >> subject_name_dir97_AP, subject_name_dir95_PA, and so on. I understand that >> AP , PA corresponds to the phase encoding direction but what are the >> different files for (dir 95, 96, 97) if according to point 2., each file >> has different b-values? Why do 6 files exist in each subject's folder? If >> these are for different gradient tables used, for CSD tractography can I >> choose any one file with its corresponding bval and bvec file for >> analyses? >> 4. Same goes for the 7T data, what do the dir71 and dir72 mean? How >> do these files differ? I couldn't find any information for the 7T data in >> the manual. >> >> >> Apologies for the very basic questions. >> >> >> >> Looking for any help / clarification regarding these. >> >> >> Thank you. >> >> >> Regards, >> Shruti >> >> _______________________________________________ >> 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
