Dear HCP experts,
I have some questions about the usage of CIFTI files.
1. I checked the number of grayordinates of the following files using the
command “wb_command -file-information”, and I noticed some of them have
different number of grayordinates:
“Parcels_LR.dlabel.nii” from Gordon et al.’s parcellation: 64984 grayordinates
(32492 left cortex vertices and 32492 right cortex vertices).
“100206.aparc.a2009s.32k_fs_LR.dlabel.nii”: 59412 grayordinates (29696 left
cortex vertices and 29716 right cortex vertices)
“100206.MyelinMap.32k_fs_LR.dscalar.nii”: 59412 grayordinates (29696 left
cortex vertices and 29716 right cortex vertices)
“HCP_S900_820_rfMRI_MSMAll_groupPCA_d4500ROW_zcorr.dconn.nii”: 91282
grayordinates (29696 left cortex vertices, 29716 right cortex vertices and
31870 subcortical voxels)
If two CIFTI files are with different number of grayordinates (e.g.,
“Parcels_LR.dlabel.nii” and “100206.MyelinMap.32k_fs_LR.dscalar.nii”), when
both loaded into the MATLAB using "ciftiopen", then the first file will be just
a 64984x1 array, and the second file will be just a 59412x1 array, but there is
no other information about the correspondence of the same grayordinate between
these two files. My question is how could I locate the same brain grayordinate
from them?
2. I have the time series of only a subset of cortical surface vertices in a
MATLAB matrix (e.g., a 59412x1200 matrix). How could I save the time series of
the subset of cortical surface vertices in a CIFTI *.dtseries.nii file? The
header of existing CIFTI *.dtseries.nii file cannot be used directly since I
didn’t find such *.dtseries.nii file with a dimensionality of 59412x1200.
Similarly, I also have the pairwise correlations between only a subset of
cortical surface vertices in a MATLAB matrix (e.g., just a 59412x59412 matrix,
not like a 91282x91282 matrix which also includes subcortical voxels). How
could I save it in a CIFTI *.dconn.nii file? The header of existing CIFTI
*.dconn.nii file cannot be used directly since I didn’t find such *.dconn.nii
file with a dimensionality of 59412x59412.
3. How could I obtain surface vertex adjacencies of the fs_LR 32k surface using
wb_command? I am looking for some commands in Connectome Workbench equivalent
to the command “caret_command -surface-topology-neighbors” in the Caret
software.
Thank you very much!
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