Calibration method, device and storage medium of radiotherapy equipment

An error calibration method of radiotherapy equipment comprising an imaging system, wherein an imaging body disposed within a preset distance range of an isocenter of the radiotherapy equipment is adopted for error calibration of the radiotherapy equipment, and the error calibration method comprises:

• imaging the imaging body through the imaging system to obtain an actual image of the imaging body;
• determining an image deviation between the actual image and a theoretical image of the imaging body, the theoretical image being obtained in advance based on a theoretical position of the imaging system and a spatial position of the imaging body in the radiotherapy equipment;
• and
• determining a system error of the imaging system based on the image deviation,
• wherein the radiotherapy equipment further comprises a positioning system, and the positioning system comprises a locating reference device and a treatment couch;
• and
• after determining the system error of the imaging system based on the image deviation, the error calibration method further comprises:
• acquiring a scanned image of a model body placed on the treatment couch, the model body being provided with a reference point thereon;
• positioning the model body on the treatment couch through the locating reference device and the treatment couch to enable that the reference point on the model body overlaps a central point of the positioning system;
• moving the treatment couch based on a position relationship between the central point of the positioning system and the isocenter of the radiotherapy equipment, to put the model body into the radiotherapy equipment;
• imaging the model body that is put into the radiotherapy equipment through the imaging system to obtain an initial image of the model body;
• performing error compensation on the initial image of the model body based on the system error of the imaging system;
• determining the initial image of which the error compensation is accomplished as an actual image of the model body;
• and
• calibrating the positioning system based on the actual image and the scanned image of the model body to obtain a system error of the positioning system.

A non-transitory computer readable storage medium, wherein an instruction is stored in the computer readable storage medium;

• and when the computer readable storage medium runs on a computer, the computer executes an error calibration method of radiotherapy equipment comprising an imaging system, wherein an imaging body disposed within a preset distance range of an isocenter of the radiotherapy equipment is adopted for error calibration of the radiotherapy equipment, and the error calibration method comprises:
• imaging the imaging body through the imaging system to obtain an actual image of the imaging body;
• determining an image deviation between the actual image and a theoretical image of the imaging body, the theoretical image being obtained in advance based on a theoretical position of the imaging system and a spatial position of the imaging body in the radiotherapy equipment;
• and
• determining a system error of the imaging system based on the image deviation, wherein the radiotherapy equipment further comprises a positioning system, and the positioning system comprises a locating reference device and a treatment couch;
• and
• after determining the system error of the imaging system based on the image deviation, the error calibration method further comprises:
• adjusting the imaging system based on the system error of the imaging system for error correction;
• acquiring a scanned image of a model body placed on the treatment couch, the model body being provided with a reference point thereon;
• positioning the model body on the treatment couch through the locating reference device and the treatment couch, to enable that the reference point on the model body overlaps a central point of the positioning system;
• moving the treatment couch based on a position relationship between the central point of the positioning system and the isocenter of the radiotherapy equipment, to put the model body into the radiotherapy equipment;
• imaging the model body that is put into the radiotherapy equipment through the imaging system subjected to the error correction to obtain an actual image of the model body;
• and
• calibrating the positioning system based on the actual image and the scanned image of the model body to obtain a system error of the positioning system.