Hi all, I have extracted the voxel to voxel connectivity correlation matrix from the 33 gb file HCP_S500_R468_MIGPd4500ROW.dconn.nii, which is a dense connectivity file. Using the wb_command - *nifti-information -print-xml* I also pulled out the xml header information within this file. And, I have with me the Row and Column headers for voxel indices in the file obtained through the wb_command - *wb_command -cifti-export-dense-mapping*. After going over the CIFTI-2 documentation I have a query about this field in the header - *TransformationMatrixVoxelIndicesIJKtoXYZ*. What is the use of this matrix, and how do I use it? The documentation is not clear about how to convert from IJK to XYZ. It just mentions the structure of the matrix and I am unable to think of any matrix operations to apply on IJK indices. Also, are the voxel indices mentioned in the .nii file, not the actual voxel coordinates? Should we apply this transformation matrix to obtain that?
Any advice will be highly appreciated. Thank you. _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
