[HCP-Users] FW: tractography

[Glasser, Matthew]

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What is it that you are trying to achieve?  Usually one uses a seed of all white matter voxels with matrix3. Peace, Matt. From: Maarten Vaessen <m.vaes...@gmail.com> Date: Sunday, July 19, 2015 at 3:41 AM To: Matt Glasser <glass...@wusm.wustl.edu> Subject: Re: [HCP-Users] tractography Hi Matthew, I tried to use the file you suggested, and I can convert the .dot without problem. However, the results don't make any sense, so I think there might be something wrong in my processing pipeline. Would you mind having a quick look at it and see if I do something wrong? Attached is the pipeline and a screenshot from the matrix as loaded in MATLAB. As you can see from the screenshot, there is only very limited number of none zeros. And weirdest of all, they appear at column indices which are probably somewhere in the right hemisphere (seed is in the left). Thanks, -Maarten On Wed, Jul 15, 2015 at 6:20 PM, Glasser, Matthew <glass...@wusm.wustl.edu> wrote: You should be able to use this file:  https://github.com/Washington-University/Pipelines/blob/master/global/templates/91282_Greyordinates/91282_Greyordinates.dscalar.nii Peace, Matt. From: <hcp-users-boun...@humanconnectome.org> on behalf of Maarten Vaessen <m.vaes...@gmail.com> Date: Wednesday, July 15, 2015 at 4:44 AM To: "hcp-users@humanconnectome.org" <hcp-users@humanconnectome.org> Subject: Re: [HCP-Users] tractography Hello, I followed the guide lines below to create a dense connectome with probtrackx. I was just wondering how to proceed with converting the .dot file from probtrackx to cifti using wb_command -probtrackx-dot-convert (for visualisation in wb_view). Specifically, what cifti file can I use as input for the -row-cifti option? So, what files released with the HCP data contain the correct brainmap? Thx -Maarten _______________________________________________________________ Hi You need to create such a file that contains the 90k grayordinates. To ensure consistency we do that in MNI 2mm space: - First create surface files in an FSL friendly format. Use the 32k surfaces, as the vertices are ~2mm apart. Left Surface: surf2surf -i $Subject/MNINonLinear/fsaverage_LR32k/${Subject}.L.white.32k_fs_LR.surf.gii -o white.L.asc --outputtype=ASCII --values=$Subject/MNINonLinear/fsaverage_LR32k//${Subject}.L.atlasroi.32k_fs_LR.shape.gii Right Surface: surf2surf -i $Subject/MNINonLinear/fsaverage_LR32k/${Subject}.R.white.32k_fs_LR.surf.gii -o white.R.asc --outputtype=ASCII --values=$Subject/MNINonLinear/fsaverage_LR32k//${Subject}.R.atlasroi.32k_fs_LR.shape.gii - Then extract the volume subcortical files from e.g. $Subject/MNINonLinear/ROIs/Atlas_Rois.2.nii.gz, let’s say as CIFTI_Structure_{Name}.nii.gz, using e.g. fslmaths or your favourite tool for ROI extraction. You should get 19 of these NIFTI files. (You can obviously use your favourite subcortical parcellation here, but if you want consistency with the CIFTI standard grayordinates, you need to resample the final results, the file above ensures consistency). - Put all the filenames in a text file in the following sequence, to ensure consistency with the rest of the CIFTIs: white.L.asc white.R.asc CIFTI_STRUCTURE_ACCUMBENS_LEFT.nii.gz CIFTI_STRUCTURE_ACCUMBENS_RIGHT.nii.gz CIFTI_STRUCTURE_AMYGDALA_LEFT.nii.gz CIFTI_STRUCTURE_AMYGDALA_RIGHT.nii.gz CIFTI_STRUCTURE_BRAIN_STEM.nii.gz CIFTI_STRUCTURE_CAUDATE_LEFT.nii.gz CIFTI_STRUCTURE_CAUDATE_RIGHT.nii.gz CIFTI_STRUCTURE_CEREBELLUM_LEFT.nii.gz CIFTI_STRUCTURE_CEREBELLUM_RIGHT.nii.gz CIFTI_STRUCTURE_DIENCEPHALON_VENTRAL_LEFT.nii.gz CIFTI_STRUCTURE_DIENCEPHALON_VENTRAL_RIGHT.nii.gz CIFTI_STRUCTURE_HIPPOCAMPUS_LEFT.nii.gz CIFTI_STRUCTURE_HIPPOCAMPUS_RIGHT.nii.gz CIFTI_STRUCTURE_PALLIDUM_LEFT.nii.gz CIFTI_STRUCTURE_PALLIDUM_RIGHT.nii.gz CIFTI_STRUCTURE_PUTAMEN_LEFT.nii.gz CIFTI_STRUCTURE_PUTAMEN_RIGHT.nii.gz CIFTI_STRUCTURE_THALAMUS_LEFT.nii.gz CIFTI_STRUCTURE_THALAMUS_RIGHT.nii.gz - You can then use such a file in FSL probtrackx2 as a seed (for Matrix1) or as a target3 (for Matrix3). Notice that running a single probtrackx2 command with all these seed locations and with many samples per location will require huge processing power and memory. In practice, we run multiple probtrackx2 in parallel, by splitting and parallelising the computation by using the --rseed option in probtrackx2 and using a small number of samples --nsamples per instance. I.e. instead of running one command, which will attempt to propagate 5000 curves per seed, we can run e.g. 100 instances of the above commands, using --nsamples=50 and --rseed=i, i=1..100. Results can then be combined using fdt_matrix_merge (which however also needs quite a lot of memory to produce the final dense connectomes, but at least it is one final process). - Another approach for parallelisation would be to split the seed locations and merge the final matrices. There is no solution that fits all systems, you should try and find the best approach depending on your computing resources. Hope this helps Stam On 19 May 2015, at 01:01, David R. Haynor <hay...@uw.edu<mailto:hay...@uw.edu>> wrote: hi HCP, we are trying to do tractography using FSL and HCP data. i have some questions -- i suspect they have been answered already, but couldn't find those answers: 1. is there a file containing the grayordinate coordinates in the diffusion space for a particular subject, both subcortical voxels and cortical vertices? 2. if i want to use some cortical and subcortical voxels from the list of grayordinates as targets, do i have to run probtrackx2 twice (i.e. once for the cortical surface vertices and once for the subcortical voxels), or can i run it just once? 3. where is the label file for the grayordinate vertices/voxels for a given subject? thanks in advance. -dh _______________________________________________ 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.orghttp://lists.humanconnectome.org/mailman/listinfo/hcp-users _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users   The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. 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