SmartPaint is a freely distributed software for interactive segmentation of medical volume images. This software was developed at the Centre for Image Analysis and the Department of Radiology, Oncology and Radiation Sciences, Uppsala University. A description of SmartPaint can be found in this publication:
F. Malmberg, R. Nordenskjöld, R. Strand and J. Kullberg
SmartPaint — A Tool for Interactive Segmentation of Medical Volume Images
Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2014
If you use this software for research purposes, please cite the aforementioned paper in any resulting publication.
A user's guide is available here.