Dose monitoring detector calibration device and method in heavy ion beam treating carcinoma

Abstract

The invention relates to a device and a method for demarcating and calibrating a dose monitoring detector in heavy ion beam cancer treatment. The structure of the device is characterized in that a collimator, the dose monitoring detector, a mini ridge-shaped filter, a water tank and a standard ionization chamber are arranged on a beam flux axis in sequence. The standard ionization chamber is arranged inside the water tank. The depth position of an irradiation beam mini spread-out Bragg peak in water is obtained by measuring absorbed dose of the standard ionization chamber at different depth in aqueous medium. At the depth position, the dose monitoring detector is demarcated and calibrated by the standard ionization chamber so as to obtain demarcating and calibrating factors of the measurement of the dose monitoring detector for the mini spread-out Bragg peak cancer treatment beam with a Gauss arrangement. With the demarcating and calibrating factors, the entire process of three-dimensional conformal irradiation therapy with uniform physical absorption dose or uniform biological effective dose in a tumor target volume can be conveniently controlled, the requirements of the treatment of different clinical cases in practical clinical treatment are satisfied, and the treatment efficiency of a treatment device is improved.

Description

technical field [0001] The invention relates to a device and method for calibrating and calibrating a dose monitoring detector in the implementation of heavy ion beam three-dimensional conformal irradiation for cancer treatment. Using this method, on the one hand, it can be confirmed that the accelerator provides the energy of the heavy ion beam, and on the other hand, it is convenient to control the three-dimensional conformal irradiation therapy with uniform physical absorption dose and uniform biological effective dose in the tumor target area, satisfying different clinical cases in actual clinical treatment. need for treatment. Background technique [0002] Due to its inverted depth dose distribution, small side scatter, high relative biological effect (RBE) and low oxygen enhancement ratio (OER), heavy ion beam therapy has become the most advanced and advanced technology in the world today. effective radiation therapy. At present, only a few developed countries and my...

AI Technical Summary

Problems solved by technology

It can be seen that for tumor target areas with different thicknesses in the beam direction, different ridge filters need to be designed to broaden the Bragg peak of the beam to adapt to the thickness of the tumor target area, and the above method needs to be used for dose monitoring. The calibration and calibration of the therapeutic beam response with different broadened Bragg peaks is very cumbersome and time-consuming in actual clinical treatment applications, which reduces the efficiency of heavy ion beam therapy devices for treating patients

Images