GEANT4 based simulation framework for particle therapy system

The particle therapy simulation framework has been developed for radiation therapy using GEANT4 simulation toolkit. The developed simulation framework provides a common interface for composing irradiation systems of different radiation therapy facilities. A particle therapy simulator on the framework represents a treatment room with an irradiation system. Popular beam modifiers for hadron therapy are included in the framework as beam modules and are utilized for composing an irradiation system. The developed framework is designed to be able to customize beam modules as flexible as possible without modifying source codes, because end users such as medical physicists are supposed not to be familiar with developing programming code. Each three types of irradiation systems have been successfully carbon therapy.