Yes as long as you have phase reversed b0s you can have the DWIs have unique directions. The HCP diffusion pipeline might need modification to accommodate that.
Peace, Matt. From: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of HMZ <hmz...@163.com<mailto:hmz...@163.com>> Date: Tuesday, May 23, 2017 at 2:14 AM To: "hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>" <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Cc: "g...@pku.edu.cn<mailto:g...@pku.edu.cn>" <g...@pku.edu.cn<mailto:g...@pku.edu.cn>>, Jia-Hong Gao <j...@pku.edu.cn<mailto:j...@pku.edu.cn>> Subject: [HCP-Users] Question about DWI protocol Dear HCP experts, This is Meizhen Han from Center for MRI research at Peking University in China. I'm writing for seeking a solution for the problem we encountered during the application of HCP MRI sequence on our recent research. I noticed that HCP acquired DWI data twice with reversed phase direction in order to calculate the fieldmap, which I think is perfect but a little time-consuming especially when 2 or 3 gradient tables are used. I'm wondering whether it is OK to acquire one phase encoding direction of one gradient table and reversed direction of another gradient table. Taking Lifespan DWI protocol of UM for example, can we only get DWI_dir98_AP and DWI_dir99_PA, and then take out b0 images in both files to caculate fieldmap? Any relevant information and idea would help a lot. Thank you very much! Looking forward to your reply. -- Best Regards! Meizhen Han -- Meizhen Han PhD Candidate Center for MRI Research Peking University Beijing, China _______________________________________________ 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
