DEVICE AND METHOD FOR MEASURING DOSE DISTRIBUTION OF CORPUSCULAR RAYS BY OPTICAL CT

PROBLEM TO BE SOLVED: To provide an accurate treatment plan by accurately measuring the three-dimensional (3D) dose distribution of corpuscular rays. SOLUTION: When measuring the 3D dose distribution of corpuscular rays, corpuscular rays are made incident to a scintillator, light is emitted and the quantity of that emitted light is measured by a photodetector in a plurality of directions perpendicular to the incident direction of corpuscular rays. Then, the 2D dose distribution of a cross section perpendicular to the corpuscular rays is calculated from a plurality of measured results, and the 3D dose distribution of corpuscular rays is constructed from a plurality of 2D dose distributions calculated along with the incident direction of corpuscular rays.