The system uses the concept of an augmented reality magic mirror to create the illusion that the user has a kind of X-ray view into her own body. Such a system can e.g. be used for education of anatomy. It uses the Microsoft Kinect to estimate the position of the user. This work has been done by Tobias Blum and Nassir Navab from the Chair for Computer Aided Medical Procedures & Augmented Reality (http://campar.in.tum.de/)
(via YouTube by campTUM )