X-ray imaging system and dose display method

An X-ray imaging system comprising:

• an imaging unit including an X-ray irradiation unit having an X-ray source that irradiates a subject on a table with X-rays and an X-ray detection unit that detects X-rays emitted from the X-ray irradiation unit;
• a moving mechanism configured to change an imaging unit angle which is an angle of the imaging unit;
• a dose calculation processing unit configured to calculate a dose of X-rays irradiated onto the subject;
• and
• a display unit configured to display the dose of X-rays calculated by the dose calculation processing unit,
• wherein the dose calculation processing unit includes
• a model dose calculation unit configured to calculate a dose distribution on a surface of a three-dimensional virtual model representing the subject on the table, based on the dose of the X-rays irradiated onto the subject by the imaging unit,
• an angle associating unit configured to associate the imaging unit angle with a surface of the virtual model, based on the imaging unit angle and a position on the surface of the virtual model to be irradiated with X-rays, and,
• an angular dose calculation unit configured to calculate the dose in each of a plurality of angular regions partitioned by each of predetermined angular intervals of the imaging unit angle, based on the dose distribution on the surface of the virtual model calculated by the model dose calculation unit and the imaging unit angle associated with the surface of the virtual model by the angle associating unit,
• wherein the display unit is configured to display an angular dose image capable of identifying magnitude of the dose in each of the plurality of angular regions calculated by the angular dose calculation unit, and
• wherein the X-ray imaging system further comprises:
• an operation unit configured to accept an input operation by an operator, and
• wherein the moving mechanism is configured to change the imaging unit angle so that the selected angular region is irradiated with X-rays when an operation to select one of the plurality of angular regions in the angular dose image is accepted by the operation unit.

A dose display method comprising:

• a step of calculating a dose distribution on a surface of a three-dimensional virtual model representing a subject on a table, based on the dose of X-rays irradiated onto the subject by X-ray irradiation by an imaging unit, the imaging unit including an X-ray irradiation unit having an X-ray source that irradiates the subject on the table with X-rays and an X-ray detection unit that detects the X-rays irradiated from the X-ray irradiation unit;
• a step of associating an imaging unit angle with a surface of the virtual model, based on the imaging unit angle that is an angle of the imaging unit and a position on a surface of the virtual model to be irradiated with the X-rays;
• a step of calculating the dose in each of a plurality of angular regions partitioned by each of predetermined angular intervals of the imaging unit angle, based on the calculated dose distribution on the surface of the virtual model and the imaging unit angle associated with the surface of the virtual model;
• and
• a step of displaying an angular dose image capable of identifying magnitude of the calculated dose in each of the plurality of angular regions.