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.There are provided a scanning electromagnet 3 having hysteresis that scans a charged particle beam accelerated by an accelerator 52, a scanning power supply 4 that outputs an excitation current for driving the scanning electromagnet 3, a magnetic-filed sensor 20 that measures the magnetic field of the scanning electromagnet 3 driven by the excitation current, and an irradiation control apparatus 5 that controls the scanning power supply 4 based on a measurement magnetic field Bs measured by the magnetic-field sensor 20 and target irradiation position coordinates Pi of the charged particle beam 1b. The irradiation control apparatus 5 is provided with an inverse mapping means 22 that calculates a target magnetic field Bi, based on the target irradiation position coordinates Pi of the charged particle beam 1b and a controller that produces an instruction value Io of excitation current for the scanning power supply 4 such that the magntic-field error Be between the target magnetic field Bi and the measurement magnetic field Bs is the same as or smaller than a predetermined threshold value, and outputs the instruction value Io to the scanning power supply 4.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:掃掠電磁鐵3,掃掠藉由加速器52所加速的荷電粒子射束,並具有磁滯;掃掠電源4,係輸出驅動掃掠電磁鐵3的勵磁電流;磁場感測器20,係測定藉由勵磁電流驅動的掃掠電磁鐵3的磁場;以及照射控制裝置5,係依據藉由磁場感測器20所測定的測定磁場Bs及荷電粒子射束1b的目標照射位置Pi控制掃掠電源4。照射控制裝置5係具有:逆映像手段22,係從荷電粒子射束1b的目標照射位置座標Pi運算目標磁場Bi;及控制器,生成給使目標磁場Bi與測定磁場Bs的磁場誤差Be為預定的臨限值以下的掃掠電源4的勵磁電流的指令值Io,並將指令值Io輸出至掃掠電源4。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.
