Radiotherapy errors analysis before plan delivery based on probabilistic safety analysis method

The error that a wrong treatment plan be delivered was very serious. We vigorously explore effective method to analyze the factors which lead to this error, thus effectively improves radiotherapy quality. Fault tree analysis has been used for radiotherapy planning errors analysis in this study. After a fault tree was constructed from top to bottom then import the reliability data of basic events from clinical cases in a local radiotherapy center, at last the fault tree was calculated by reliability and probabilistic safety assessment program RiskA, developed by FDS Team. Results shown that the most important basic event was wrong patient and the second was diagnose errors.