get.ijk.from.index {espadon}R Documentation

Conversion of the indices of a point into ijk vector

Description

The get.ijk.from.index function converts the voxel indices of vol$vol3D.data (for example, obtained with the function which) into a vector or matrix of DICOM indices i, j, k.

Usage

get.ijk.from.index(idx, vol)

Arguments

idx

Index, or matrix of voxel indices of the array vol$vol3D.data.

vol

"volume" class object.

Value

Returns an i, j, k column matrix of the DICOM indices of the points of vol$vol3D.data.

See Also

get.value.from.ijk, display.kplane

Examples

# loading of toy-patient objects (decrease dxyz and increase beam.nb for 
# better result)
step <- 4
patient <- toy.load.patient (modality = "rtdose", roi.name = "", 
                             dxyz = rep (step, 3), beam.nb = 3)
D <- patient$rtdose[[1]]

# voxels location where the dose is greater than 99.9% Dmax
Dmax <- max (D$vol3D.data, na.rm = TRUE) # D$max.pixel
get.ijk.from.index (which (D$vol3D.data >= 0.999 * Dmax), D)
# or
get.ijk.from.index (which (D$vol3D.data >= 0.999 * Dmax, arr.ind = TRUE), D)

ijk <- as.numeric (get.ijk.from.index (which.max (D$vol3D.data), D))
display.kplane (D, k = ijk[3]) 

[Package espadon version 1.2.0 Index]