RegionSphere: Create a Spherical Region of Interest
In bbuchsbaum/neuroim: Data Structures and Handling for Neuroimaging Data

Description Usage Arguments Value Examples

Creates a Spherical ROI based on a Centroid.

1	RegionSphere(bvol, centroid, radius, fill = NULL, nonzero = FALSE)

`bvol`	an `BrainVolume` or `BrainSpace` instance
`centroid`	the center of the sphere in voxel space
`radius`	the radius in real units (e.g. millimeters) of the spherical ROI
`fill`	optional value(s) to store as data
`nonzero`	if `TRUE`, keep only nonzero elements from `bvol`

an instance of class ROIVolume

 sp1 <- BrainSpace(c(10,10,10), c(1,2,3))
 cube <- RegionSphere(sp1, c(5,5,5), 3.5)
 vox <- coords(cube)
 cds <- coords(cube, real=TRUE)
 ## fill in ROI with value of 6
 cube1 <- RegionSphere(sp1, c(5,5,5), 3.5, fill=6)
 all(cube1@data == 6)