1. There is a rigid registration between diffusion and structural space and the appropriate rotation is applied to the bvecs so dtifit or bedpostx are still valid to apply. 2. Resolution is separate from registration. For example you can overlay images in the same mm space but different resolutions in Connectome Workbench.
Peace, Matt. From: Xinyang Liu <xinyang_ie...@163.com<mailto:xinyang_ie...@163.com>> Date: Tuesday, November 21, 2017 at 2:58 AM To: Matt Glasser <glass...@wustl.edu<mailto:glass...@wustl.edu>> Cc: HCP 讨论组 <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Subject: Re: [HCP-Users] Structural space diffusion data Dear Matthew, Thank you very much for your helpful reply. I've found the structural-to-standard transformation file you mentioned in the databox. Now here are two new questions which I cannot make clear. 1. If the preprocessed diffusion data have already been transformed and stored in the structural space, e.g. data.nii.gz, how to explain that these data can be directly processed by DTIFIT, which are supposed only be done in the diffusion space? 2. The resolution for diffusion data are 1.25mm, as well as the resampled structural file T1w_acpc_dc_restore_1.25.nii.gz, which are also stored in the diffusion data file. But the individual's structural image resolution in the structural data files are actually 0.7mm. The resolutions are not match. So can we directly use the acpc_dc2standard.nii.gz, or we need to do a second registration? Maybe my questions are too naïve, but look forward to your kind guidance. Thanks a lot. Best regards, Xinyang At 2017-11-21 11:37:42, "Glasser, Matthew" <glass...@wustl.edu<mailto:glass...@wustl.edu>> wrote: That’s right and that transformation is already provided ${StudyFolder}/${Subject}/MNINonLinear/xfms/acpc_dc2standard.nii.gz. Peace, Matt. From: <hcp-users-boun...@humanconnectome.org<mailto:hcp-users-boun...@humanconnectome.org>> on behalf of Xinyang Liu <xinyang_ie...@163.com<mailto:xinyang_ie...@163.com>> Date: Monday, November 20, 2017 at 9:33 PM To: HCP 讨论组 <hcp-users@humanconnectome.org<mailto:hcp-users@humanconnectome.org>> Subject: [HCP-Users] Structural space diffusion data Dear HCP experts, When reading tutorials about the HCP preprocessing pipeline, I noticed that there is a registration processing of diffusion data to the 1.25 mm structural space. So does that mean all the diffusion data are already in the structural space now after preprocessing, together with the T1w_acpc_dc_restore_1.25.nii.gz native structural image? And if so, does that mean if we want to further do data registration to standard templates, we only need to transform between structural and standard space? Is my understanding correct? Any guidance would be very appreciated. Thanks. Best regards, Xinyang Liu _______________________________________________ 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