Dose distribution measurement device

A dose distribution measurement device for measuring an irradiation dose distribution to be generated when an irradiation-related device for irradiating an irradiation target with a particle beam as a pencil beam irradiates a three-dimensional target region with the particle beam by scanning, every time an energy level of the particle beam is changed, the particle beam over a two dimensional region of the irradiation target at a depth position corresponding to the energy level with repetition of staying and shifting of the particle beam in a two-dimensional direction perpendicular to the beam traveling direction, the dose distribution measurement device comprising:

• a water phantom having a fluorescent substance containing liquid that emits light by being irradiated with the particle beam and provided with an incident window for incident of the particle beam;
• one camera disposed outside the water phantom and on a plane perpendicular to an irradiation center axis in the water phantom, of the particle beam so as to take images of light emission of the fluorescent substance containing liquid;
• and
• a dose distribution calculation and evaluation unit including:
• a camera image processing part processing an image taken with the one camera;
• an irradiation-region dose-distribution data storage part storing a dose distribution data for an irradiation region set in a treatment planning device;
• an image prediction part predicting a camera image taken at the position of the one camera from the dose distribution data stored in the irradiation-region dose-distribution data storage part, to store the predicted image;
• and
• a dose distribution evaluation part evaluating the one camera taken image processed by the camera image processing part with the predicted image stored in the image prediction part, to evaluate the the one camera taken image.

A dose distribution measurement device that measures pencil beam source data of a particle beam, the dose distribution measurement device comprising:

• a water phantom having a fluorescent substance containing liquid that emits light by being irradiated with the particle beam and provided with an incident window for incident of the particle beam;
• one camera disposed around the water phantom and on a plane perpendicular to an irradiation center axis in the water phantom, of the particle beam so as to take images of light emission of the fluorescent substance containing liquid;
• and
• a dose distribution calculation and evaluation unit including:
• a camera image processing part processing an image taken with the one camera;
• a one-dimensional light intensity distribution calculation part extracting a one-dimensional light intensity distribution from an image processed by the camera image processing part from a camera image, taken with the one camera, of light emission induced by irradiation of the fluorescent substance containing liquid with the particle beam as the pencil beam during staying of the particle beam;
• a dose distribution evaluation part obtaining PDD data and OCR data of the particle beam as the pencil beam from the one-dimensional light intensity distribution extracted by the one-dimensional light intensity distribution calculation part.