Rapid dosage verifying method based on X-ray imaging flat panel detector

Abstract

The invention relates to a rapid dosage verifying method based on an X-ray imaging flat panel detector, and the method comprises the steps: enabling a radiotherapy device to carry out irradiation according to all irradiation field parameters of a radiotherapy plan before the radiotherapy, and enabling the X-ray imaging flat panel detector to collect two-dimensional X-ray irradiation field images at the same time; converting the two-dimensional X-ray irradiation field images into the two-dimensional plane dosage distribution of a specific equivalent water depth, carrying out the reverse calculation of a two-dimensional plane dosage of an isocenter, and achieving the dosage verification of the radiotherapy plan before radiotherapy through the comparison and evaluation of the two-dimensional plane dosage calculated by a radiotherapy plan system and an actual measured two-dimensional plane dosage. The method irons out the defects that a conventional clinic dosage verification technology consumes a large amount of time and labor and needs to turn the irradiation field angle to zero, alleviates the burden of a clinic medical physic doctor, can achieve the precise and quick verification of dosage, and is high in applicability.

Description

technical field [0001] The invention relates to the technical field of on-line dose verification of radiotherapy instruments, in particular to a fast dose verification method based on an X-ray imaging flat panel detector. Background technique [0002] Accurate radiotherapy technology has developed from the original three-dimensional conformal radiotherapy (CRT) to the current volume-modulated radiotherapy (VMAT). The radiotherapy plan is becoming more and more complex, and the requirements for the output accuracy of medical accelerators are also getting higher and higher. In radiation therapy, the drift of the output dose of the medical accelerator and the inaccuracy of the MLC position may cause insufficient dose in the target area of ​​​​tumor patients or overdose in crisis organs, seriously affecting the cure rate of tumors, which makes the verification of radiotherapy plans more and more important. [0003] The traditional plan verification method is to load the patient ...

AI Technical Summary

Problems solved by technology

[0006] The technical solution of the present invention: Aiming at the problem that the existing radiotherapy dose verification method is time-consuming and laborious, and unable to verify the execution accuracy of the radiotherapy plan under the actual irradiation angle, a fast dose verification method based on X-ray imaging flat panel detector is provided. Physicists There is no need to place additional ionization chambers and verification phantoms, and no need to return the field angle to zero. It can simulate real irradiation according to the actual radiotherapy plan to achieve accurate dose verification

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