Computer Assisted Cardiac Surgery (CACS) is an interdisciplinary cooperation between Cardiac Surgery, Computer Science and Medical Engineering.It aims to support the cardiac surgeon in diagnostics, therapeutic procedures and interventions.Therefore, an accurate model of the patient is necessary.It can be generated by scanning the anatomical to be operated region with the help of medical imaging techniques, i.e.CT, MRI, X-ray, US, etc.The data will be reconstructed in the computer system afterwards.Systems, which are used frequently in CACS are surgical automation (Robotics), pre-operative planning on models (Model Guided Surgery) and intra-operative imaging (Image Guided Surgery).As example, we would like to present image-guided Transapical Aortic Valve Implantation (TAP-AVI).