An objective of the present invention is to eliminate the effect of hysteresis of scanning electromagnet and obtain a particle beam irradiation apparatus realizing high-accuracy beam irradiation, which includes: a magnetic-filed sensor 20 that measures the magnetic field of the scanning electromagnet 3, and an irradiation control apparatus 5 that controls the emitting amount of the charged particle beam 1b which has passed through the scanning electromagnet 3. The cumulative value of the amount of charged particle beam 1b passing through a plurality of regions Si,j defined by the magnetic field of X-direction and Y-direction measured by a magnetic sensors 20 is derived by the irradiation control apparatus 5 for each regions Si,j, so that the emitting amount of the aforementioned charged particle beam is controlled according to the cumulative value of the aforementioned each regions Si,j.本發明的目的係獲得一種粒子線照射裝置,排除掃掠電磁鐵的磁滯的影響,並實現高精度的射束照射。其具備:磁場感測器20,係測定掃掠電磁鐵3的磁場;以及照射控制裝置5,係控制通過掃掠電磁鐵3之荷電粒子射束1b的出射量。照射控制裝置5係將通過藉由磁場感測器20所測定的X方向及Y方向的磁場所定義的複數個區域Si,j之荷電粒子射束1b之劑量的累計值依前述各區域Si,j求出,並依據前述各區域Si,j的累計值,控制前述荷電粒子射束的出射量。1a‧‧‧入射荷電粒子射束1b‧‧‧出射荷電粒子射束2‧‧‧射束輸送導管3a‧‧‧X方向掃掠電磁鐵3b‧‧‧Y方向掃掠電磁鐵4‧‧‧掃掠電源5‧‧‧照射控制裝置7‧‧‧射束位置偵測器8‧‧‧位置資料變換器11‧‧‧劑量偵測器12‧‧‧資料變換器15‧‧‧照射對象20a‧‧‧X方向電磁鐵用磁場感測器20b‧‧‧Y方向電磁鐵用磁場感測器21‧‧‧磁場資料變換器51‧‧‧射束產生裝置52‧‧‧加速器53‧‧‧射束輸送裝置54‧‧‧粒子線照射裝置55‧‧‧治療計畫裝置56‧‧‧資料伺服器Bs‧‧‧測定磁場Di‧‧‧目標劑量Ds‧‧‧測定劑量Io‧‧‧指令電流Pi‧‧‧目標照射位置座標Ps‧‧‧測定位置座標Sspo‧‧‧射束停止指令Ssto‧‧‧供給指令
