摘要 : To obtain carbon ion beam suitable for the active spot scanning beam delivery system at the Heavy Ion ResearchFacility in Lanzhou (HIRFL), the Monte Carlo (MC) program SHIELD-HIT12A was used to study the influencesof beam delivery... 展开 To obtain carbon ion beam suitable for the active spot scanning beam delivery system at the Heavy Ion ResearchFacility in Lanzhou (HIRFL), the Monte Carlo (MC) program SHIELD-HIT12A was used to study the influencesof beam delivery distance and structure period of mini ridge filter on full width at the half maximum (FWHM) ofbeam spot and dose flatness at the iso-center of the treatment room. 收起