Advances in CT-Simulation of external beam radiotherapy

Computed tomography (CT)-Simulators are system-software and they belong to one of the most significant advances in radiation oncology in the past 15-20 years. They aim to simulate the external beam treatment process using the digital computed tomography data of the patient instead the real patient. A very high percentage of patient cases (about 90 %) can be simulated using the CT-Simulator replacing the conventional Simulator. Although the idea of the CT-Simulation is old and mature systems can be found in the market, there are still areas for improvements. In this work we present a number of advanced features implemented on a CT-Simulator, named EXOMIO. These features involve interactive techniques on field delineation and advanced visualization-navigation techniques.