IMAGINE is a powerful and intuitive Matlab tool for visualization and evaluation of 3D or 4D data from various medical (file) formats.
Furthermore, it supports line, regions of interest and volumes of interest evaluations.
IMAGINE v2.0 can be downloaded via Matlab File Exchange: http://www.mathworks.com/matlabcentral/fileexchange/40440-imagine
The latest version can be found on Github: https://github.com/ImagineStudios/Imagine
A documentation is included in the download package or can be downloaded from here: IMAGINE documentation