Petter Dyverfeldt and Filip Hammaréus, (IMAGE) Linköping University Caption Petter Dyverfeldt, professor, and Filip Hammaréus, PhD student, at Linköping University. The research was performed at the Center for Medical Image Science and Visualization in Linköping, Sweden. Credit Magnus Johansson/Linköping University Usage Restrictions The contents may be downloaded, used and shared in media channels by, for example, journalists, bloggers, writers, pundits, etc., for purposes of communication, description and commenting on the press release, post or information, on the condition that the contents are used unchanged and in their entirety. The creator must be specified. License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.