read.NIFTI: I/O Functions

In WIAS-BERLIN/fmri: Analysis of fMRI Experiments

I/O Functions

Description

Read fMRI data from NIFTI file(s).

Usage

read.NIFTI(filename, level = 0.75, mask=NULL, setmask=TRUE)

Arguments

filename	name of the NIfTI file
level	Quantile level defining the mask
mask	array or nifti-object containing the mask. If set this replaces the mask defined by argument level.
setmask	Logical (default TRUE), whether to define a suitable mask based on level

Details

This function reads fMRI data files in NIfTI format.

The filename can be given with or without extension. If extension is not included, the function searches for the ".nii" file and then for the "hdr/img" pair.

Value

Object of class "fmridata" with the following list entries:

ttt	raw vector (numeric size 4) containing the four dimensional data cube (the first three dimensions are voxel dimensions, the fourth dimension denotes the time).
header	header information of the data
format	data source. string "NIFTI"
delta	voxel size in mm
origin	position of the datacube origin
orient	data orientation code
dim	dimension of the datacube
weights	weights vector coding the relative voxel sizes in x, y, z-direction
mask	head mask

Author(s)

Karsten Tabelow [e-mail]

References

Polzehl, J. and Tabelow, K. (2007) fmri: A Package for Analyzing fmri Data, R News, 7:13-17 .

See Also

read.ANALYZE, read.AFNI

Examples

 ## Not run: analyze <- read.NIFTI("niftifile.nii")

WIAS-BERLIN/fmri documentation built on Sept. 18, 2023, 4:26 a.m.