RNiftyReg (version 2.0.0)

pixdim: Pixel dimensions and units

Description

These functions return the "pixdim" and "pixunits" attributes of their arguments. These represent the physical step size between pixel or voxel centre points, and the spatial and temporal units that they are given in. The former defaults to 1 in each dimension, if there is no attribute.

Usage

pixdim(object)
pixdim(object) <- value
pixunits(object)

Arguments

object

An R object, generally an image.

value

Numeric vector of pixel dimensions along each axis. A scalar value will be recycled if necessary.

Value

• pixdim returns a numeric vector of pixel dimensions. pixunits returns a character vector of length up to two, giving the spatial and temporal unit names.