Irradiation methods and nozzle design for the advanced proton therapy facility

A conception design of the Advanced Proton Therapy Facility(APTF) has been carried out.The system intentionally employs a slow-cycling synchrotron with a maximum energy of 250 MeV,two rotating gantries and two fixed beam nozzles for the treatment.In this paper,we try to compare the strength and weaknesses between the two treatment methods:the beam spreading and the pencil beam scanning.The application of the pencil beam scanning method and the double-scattering method together with the related nozzle design...