read.ANALYZE {fmri}R Documentation

I/O Functions

Description

Read fMRI data from ANALYZE file(s).

Usage

read.ANALYZE(prefix = "", numbered = FALSE, postfix = "",
             picstart = 1, numbpic = 1, level = 0.75)

Arguments

prefix string(s). part of the file name before the number or vector of strings for filename (if numbered is FALSE)
numbered logical. if FALSE only prefix is taken as file name (default).
postfix string. part of the file name after the number
picstart number of the first image to be read.
numbpic number of images to be read
level Quantile level defining the mask

Details

This function reads fMRI data files in ANALYZE format. If numbered is FALSE, only the vector of strings in prefix is used for file name (default).

If numbered is TRUE, it takes the first string in prefix and postfix and a number of the form "007" in between to create the file name.

The number is assumed to be 3 digits (including leading zeros). First number is given in picstart, while numbpic defines the total number of images to be read. Data in multiple files will be combined into a four dimensional datacube.

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 "ANALYZE"
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

Note

Since numbering and naming of ANALYZE files widely vary, this function may not meet your personal needs. See Details section above for a description.

Author(s)

Karsten Tabelow tabelow@wias-berlin.de

References

Biomedical Imaging Resource (2001). Analyze Program. Mayo Foundation.

See Also

write.ANALYZE, read.AFNI

Examples

 ## Not run: analyze <- read.ANALYZE("analyze",TRUE,"file",31,107)

[Package fmri version 1.2-6 Index]