create_mosaic.m

create_mosiac.m - Create tiled "mosaic" images from volumes

Description

    Conceived for functional Magnetic Resonance Imaging, create_mosaic may also be useful for DWI or other applications which create image time-series
 
    Most fMRI programs use 4D matrices (x,y,z,t) in NIfTI format.
    It can be useful to reduce the number of dimension from 4 to 3 by tiling all slices (z) into a "mosaic" image for each time point (t).
    Scrolling through the 3rd dimension in the mosaic (e.g. in mricro http://www.cabiatl.com/mricro/mricro/index.html) allows the time course of each slice to be visualised.
    Useful for assessing motion and artefacts in fMRI time series.
    Can also be used to create a 2D mosaic of all the slices in a 3D volume, e.g. for structural imaging
 
    In the example below, 4D EPI times-series in NIfTI format (all called 'Image.nii') are stored in the directories '5','6','8' in the directory specified by root_dir
    create_mosaic writes a 3D mosaic file for each, in NIfTI format, in the directory results_dir, with file names Mosaic_5.nii, etc
 
    Simon Robinson. 2/May/2011. [e-mail]
    version_number = 1.0;
    Credit: includes many functions from Jimmy Shen's excellent NIfTI toolbox (file exchange # 8797)

• MATLAB release: MATLAB 7.9 (2009b)