PROBLEM TO BE SOLVED: To provide a liquid phantom device and a charged particle beam treatment apparatus which are capable of shortening measuring time for measuring radiation dose distribution.SOLUTION: A liquid phantom device comprises a two-dimensional radiation dose measuring part 13 in which a plurality of detection elements are arranged within a measuring surface, and is constituted that radiation dose at each measuring point within the measuring surface is simultaneously measured. A length in a direction where an irradiation axis of charged particle beam of liquid stored in a storage part 11 extends is changed to change a moving distance of the charged particle beam in the liquid, the two-dimensional radiation dose measuring part 13 is moved along a direction (Z direction) where the irradiation axis of the charged particle beam extends, and three-dimensional radiation dose distribution is measured.COPYRIGHT: (C)2015,JPO&INPIT【課題】線量分布を測定するための測定時間を短縮することが可能な液体ファントム装置及び荷電粒子線治療装置を提供する。【解決手段】複数の検出素子が測定面内に配置された二次元の線量測定部13を備え、測定面内の各測定点における線量を同時に測定する構成とする。貯留部11に貯留された液体の荷電粒子線の照射軸が延在する方向の長さを変化させて、荷電粒子線の液体中での移動距離を変え、二次元の線量測定部13を荷電粒子線の照射軸が延在する方向(Z方向)に沿って移動させて、三次元の線量分布を測定する。【選択図】図2
