vol_to_surf: map values from a 3d volume to a surface in the same...
In bbuchsbaum/neurosurf: Data structures and IO for surface-based neuroimaging data

map values from a 3d volume to a surface in the same coordinate space

1 2	vol_to_surf(surf_wm, surf_pial, vol, mask = NULL, fun = c("avg", "nn", "mode"), knn = 6, sigma = 8, dthresh = sigma * 2)

`surf_wm`	the white matter (inner) surface
`surf_pial`	the pial (outer) surface
`vol`	an image volume of type `NeuroVol` that is to be mapped to surface
`mask`	a mask defining the valid voxel in the image volume
`fun`	the mapping function, which can be "avg" or "nn"
`knn`	the number of nearest neighbors to consider (for "avg" mapping function)
`sigma`	the bandwidth of the smoothing kernel (for the "avg" mapping function)
`dthresh`	a valid mapping voxel only if it is less than `dthresh` units away from vertex.

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#volname <- system.file("inst/testdata/Schaefer2018_200Parcels_7Networks_order_FSLMNI152_1mm.nii",
#package="neurosurf")
#vol <- neuroim2::read_vol(volname)

bbuchsbaum/neurosurf documentation built on April 6, 2021, 10:08 a.m.