Provided is a particle radiation therapy apparatus. A controller (20) is configured to include an operation pattern holding section (25) for holding a plurality of operation patterns (OP-S, OP-L) as operation patterns periodically repeated by an accelerator (10) which have different times (To) from one another for allowing particle radiation B to be irradiated and have operation conditions respectively adjusted so as to allow a deflection electromagnet (13) of an accelerator (10) to has a desired magnet field intensity even in the presence of hysteresis, an irradiation condition reading section (22) reading irradiation conditions of every one of a plurality of slices obtained by dividing an irradiation object in a depth direction, an operation pattern selecting section (23) selecting an operation pattern suitable for the slice from the plurality of operation patterns, and a main controller (40) controlling the accelerator (10) based on the selected operation pattern for every slice and controlling an irradiating device (40) based on the irradiation conditions.本發明提供一種粒子線治療裝置。控制部(20)以設置有下述構件之方式所構成:運轉模式保持部(25),用來保持複數個運轉模式(OP-S、OP-L),以作為加速器(10)週期性地反覆進行的運轉模式,該複數個運轉模式(OP-S、OP-L)之能夠射出粒子線B之時間(To)不同,並且即使存在磁滯現象下,亦以加速器(10)之偏向電磁鐵(13)形成期望之磁場強度之方式,分別調整操作條件;照射條件讀入部(22),對於朝深度方向劃分照射對象的複數個分層,讀入每一分層的照射條件;運轉模式選擇部(23),根據讀入之照射條件,選擇複數個運轉模式之中,適合於該分層的運轉模式;以及主控制部(21),對每一分層,根據選擇的運轉模式控制加速器(10),並且根據照射條件控制照射裝置(40)。1‧‧‧粒子線治療裝置10‧‧‧加速器11‧‧‧真空導管13a至13d‧‧‧偏向電磁鐵14a至14d‧‧‧收斂用電磁鐵15‧‧‧高頻加速空洞17‧‧‧六極電磁鐵18A‧‧‧射入裝置18B‧‧‧射出裝置19‧‧‧前段加速器20‧‧‧控制部21‧‧‧主控制部22‧‧‧照射條件讀入部23‧‧‧運轉模式選擇部24‧‧‧照射條件保持部25‧‧‧運轉模式保持部30‧‧‧輸送系統31‧‧‧真空導管32‧‧‧切換電磁鐵33‧‧‧偏向電磁鐵33r‧‧‧偏向電磁鐵40‧‧‧照射裝置50‧‧‧治療室51‧‧‧治療台Imf‧‧‧磁場強度K‧‧‧患部OP-L‧‧‧長週期模式OP-S‧‧‧短週期模式ToS‧‧‧短週期模式OP-S的照射時間ToL‧‧‧長週期模式OP-L的照射時間
