This invention provides a particle beam therapeutic system having an accelerator system for accelerating an electrically charged particle beam and a beam transporting system for transporting a high energy beam emitted from the accelerator to an irradiation position, the beam transporting system having at least one steering electromagnet and at least one beam position monitor corresponding with the steering electromagnet, the beam position monitor being adapted to supply an exciting current to the steering electromagnet for correcting the beam position which varies periodically.本發明之粒子射線治療系統係由將帶電荷粒子光束予以加速之加速器系統、以及將該加速器所射出之高能量光束輸送至照射位置為止之光束輸送系統所構成,且於前述光束輸送系統具備至少1個操縱電磁鐵、以及對應於此的至少1個光束位置監視器,前述光束位置監視器係能供應補正周期性變動的光束位置之激磁電流於前述操縱電磁鐵。1‧‧‧射入系統2‧‧‧加速器系統3‧‧‧光速輸送系統4‧‧‧噴嘴11‧‧‧射入器30、31‧‧‧偏向電磁鐵32‧‧‧四極電磁鐵33‧‧‧操縱電磁鐵34‧‧‧光束位置監視器41‧‧‧操縱電磁鐵電源100‧‧‧粒子射線治療系統
