Radiotherapy CBCT quality control detection die body

The utility model discloses a radiotherapy CBCT quality control detection die body. The die body comprises a pedestal and a characteristic module. A concave part for placing a characteristic module is formed in the middle of the base, magnetic mounting grooves are formed in four corners of the concave part, and magnets are arranged at the bottoms of the magnetic mounting grooves; supporting legs penetrating through the base are arranged at four corners of the base; the feature module is of a cubic stacked structure and sequentially comprises a water mold body, a center overlap ratio module, a low-resolution module and a high-resolution module from top to bottom. A cylindrical water storage cavity is formed in the water mold body, the top of the water storage cavity is upwards provided with a water conveying pipeline and an exhaust pipeline, and the water conveying pipeline and the exhaust pipeline penetrate through the upper wall of the water mold body to form a water inlet and an exhaust hole respectively. T