In the particle beam irradiation chamber of the present invention, the patient is positioned even after moving from the entrance of the irradiation chamber to the irradiation region after positioning the patient other than the patient table in the irradiation region used when actually irradiating the particle beam. The purpose is to keep the amount of positional deviation within an allowable range. According to the particle beam irradiation chamber (20) of the present invention, a patient table (2) having a removable top plate (5) and a driving device (9) for driving the top plate (5) is installed, and a shielding wall is provided. On the side of the irradiation chamber (22) surrounded by (21) and the front chamber (25) where the patient (45) in the shielding wall (21) is positioned with respect to the top plate (5), the top plate ( 5) The passageway (23) provided so that the patient (45) positioned relative to the irradiation execution chamber (22) can be linearly passed by the transfer device (10), and the front chamber (25) side in the passage (23). And a shielding door (24) for shielding leakage radiation at the time of irradiating the particle beam to a control value or less at the irradiation chamber entrance (30) located at the position.本発明の粒子線照射室は、実際に粒子線を照射する際に用いる照射領域の患者台以外で患者の位置決めを行った後に、照射室の入口から照射領域へ移動しても、患者の位置決め状態の位置ずれ量を許容範囲内することを目的とする。 本発明の粒子線照射室(20)によれば、着脱自在な天板(5)と天板(5)を駆動する駆動装置(9)とを有する患者台(2)が設置され、遮蔽壁(21)で囲まれた照射実行室(22)と、遮蔽壁(21)における患者(45)を天板(5)に対して位置決めする前室(25)の位置する側に、天板(5)に対して位置決めされた患者(45)が搬送装置(10)により照射実行室(22)へ直線通行可能に設けられた通路(23)と、通路(23)における前室(25)側に位置する照射室入口(30)に、粒子線を照射する際の漏えい放射線を管理値以下に遮蔽する遮蔽扉(24)と、を備えたことを特徴とする。
