Professor Karl Oldhafer, chief physician of general and visceral surgery at the Asklepios Hospital Hamburg-Barmbek, adjusts a tablet computer to access and visualize planning data during liver surgery, one of the first liver surgeries of its kind in Germany August 15, 2013. The tablet computer uses augmented reality, which allows the liver to be filmed with an iPad and overlaid during an operation with virtual 3D models reconstructed from the real organ. Developed by Fraunhofer MEVIS in Bremen, this procedure helps locate critical structures such as tumors and vessels and is expected to improve the quality of transferring pre-operational resection plans into actual surgery. REUTERS/Fabian Bimmer (GERMANY - Tags: HEALTH TPX IMAGES OF THE DAY)