fmri (version 1.0)

read.ANALYZE: I/O Functions

Description

Read fMRI data from ANALYZE file(s).

Usage

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

Arguments

prefix

string. part of the file name before the number

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

Value

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

Details

This function reads fMRI data files in ANALYZE format. It takes the strings in prefix and postfix and a number of the form "007" in between to create the file name.

If numbered is FALSE, only the string in prefix is used for file name (default).

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.

References

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

See Also

write.ANALYZE, read.AFNI

Examples

analyze <- read.ANALYZE("analyze",TRUE,"file",31,107)