The Human Connectome Project (HCP) is happy to report the release of Diffusion imaging data for all 215 subjects for which diffusion was collected from Quarters 1-3 (Q1, Q2, Q3). The release includes all unprocessed and preprocessed dMRI data for these subjects, some of whom are related. All unrelated subject groups available for quick download from the splash page at https://db.humanconnectome.org/ now have complete data for all HCP MRI modalities.
The Q1-Q3 dMRI images have been reconstructed using a newer algorithm that yields significantly sharper images (recon v2). Due to differing noise (smoothness) properties, the dMRI data available as of this release should not be mixed in analyses with the dMRI data from the group of 40 unrelated Q1-Q2 subjects released in June 2013, or Q1 subjects released in March 2013, which were reconstructed with an older reconstruction algorithm (recon v1). Details on diffusion data collection and processing are available in the HCP Q3 Release Reference Manual.
This release also fixes a bug in the minimally preprocessed dMRI packages released in September 2013 and November 2013 that left out a key file (see our wiki page HCP Data Release Updates: Known Bugs/Missing files and Planned fixes). If you have previously downloaded or obtained preprocessed Q3 dMRI data via Connectome In a Box, we recommend generating the missing file per the instructions on the wiki page or downloading the minimally preprocessed dMRI data again for subjects relevant to your analyses.
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