get.ijk.from.xyz {espadon} | R Documentation |
Indices relating to the coordinates of the points
Description
The get.ijk.from.xyz
function calculates the i, j, k DICOM
indices of the points given in the patient's reference frame.
Usage
get.ijk.from.xyz(xyz = matrix(c(0, 0, 0), ncol = 3), vol, verbose = FALSE)
Arguments
xyz |
Vector of length 3, corresponding to the x, y, z coordinates (in mm) of a point in the patient's frame of reference, or 3-column matrix of x, y, z coordinates of several points. |
vol |
"volume" class object. |
verbose |
Boolean, default to |
Value
Returns a vector or a matrix of the i, j, k DICOM indices of the x, y, z coordinate points in the patient's frame of reference.
Note
The vector or matrix is made up of real numbers. It is up to the user to make the indices as integer.
The indices of the first voxel vol
are 0, 0, 0.
WARNING: As i,j,k are DICOM indices, they are not directly related to array indices.
To get the value of the vol$vol3D.data
, use the function
get.value.from.ijk.
Examples
# loading of toy-patient objects (decrease dxyz for better result)
step <- 4
patient <- toy.load.patient (modality = "ct", roi.name = "",
dxyz = rep (step, 3))
CT <- patient$ct[[1]]
get.ijk.from.xyz (xyz = CT$xyz0[1,], vol = CT, verbose = TRUE)
get.ijk.from.xyz (xyz = c (1,1,1), vol = CT, verbose = TRUE)
index <- get.ijk.from.xyz (xyz = c (1,1,1), vol = CT)
floor (index)
index <- get.ijk.from.xyz (xyz = matrix (c (0,0,0,1,1,1), ncol = 3, byrow = TRUE),
vol = CT)
floor (index)