Felix Wanschitz 1 , Franz Watzinger 1 , Christian Schopper 1 , Rolf Ewers 1 , Wolfgang Birkfellner 1 , Michael Figl 2 , Helmar Bergmann 2, 4 , Sanda Patruta 3 Franz Kainberger 5 Joachim Kettenbach 6 1 Department of Oral and Maxillofacial Surgery, University of Vienna, General Hospital Vienna 2 Department of Biomedical Engineering and Physics, University of Vienna, General Hospital Vienna , 3 Dental School, University of Vienna , 4 Ludwig-Boltzmann Institute of Nuclear Medicine, Vienna , 5 Department of Radiology, Division of Osteoradiology, University of Vienna, General Hospital Vienna , 6 Department of Radiology, Division of Angiography and Interventional Radiology, University of Vienna, General Hospital Vienna, Vienna, Austria Correspondence to: Felix Wanschitz, Department of Oral and Maxillofacial Surgery University of Vienna General Hospital Waehringer Guertel 18–20 A-1090 Vienna Austria Tel: +43 1 40400 4259 Fax: +43 1 40400 4253 e-mail: felix.wanschitz@chello.at