Radiation head device for linear accelerator

A linear accelerator, radiation head technology, applied in the directions of X-ray/γ-ray/particle irradiation therapy, phototherapy, etc., can solve the problems of occupying space, reducing space, inability to apply, etc., achieving the effect of simple structure and improved accuracy

Active Publication Date: 2015-03-11
SHANGHAI UNITED IMAGING HEALTHCARE
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AI Technical Summary

Problems solved by technology

However, the backscattering plate can only be used in the photon therapy mode and cannot be applied in the electron therapy mode, so it is necessary to increase the driving device to move the backlight plate in the photon therapy mode and move it out in the electron therapy mode, which increases the Mechanical complexity and cost occupy part of the space, reducing the space during treatment
At the same time, the use of backlight panels in photon therapy mode also reduces the dose rate of the radiation beam
Since it cannot be applied in the electronic therapy mode, it cannot solve the problem of large deviations in the dose monitoring results in the electronic therapy mode

Method used

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  • Radiation head device for linear accelerator
  • Radiation head device for linear accelerator

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Embodiment Construction

[0027] In an existing linac radiation head, a bremsstrahlung target, a primary collimator, a homogenizer, an ionization chamber, and a secondary collimator are arranged from top to bottom.

[0028] As a key component of the dose monitoring system, the dose monitoring unit is the safety guarantee for linear accelerator treatment. Ionization chambers made of Mylar materials have the advantages of low material density and thinness, can be used in both electron and photon therapy modes, and can reduce mechanical complexity and cost, so they have been more and more widely used.

[0029] However, due to the functional devices in the radiation head of the linac, such as the primary collimator, leveler, shielding unit and secondary collimator, etc., there will be a certain scattering effect on the radiation beam emitted by the ray generating unit, so that part of the scattering Particles are scattered into the dose monitoring unit, causing a large deviation between the radiation dose ...

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Abstract

A radiation head device for a linear accelerator comprises a ray generation unit, a dose monitoring unit, a function unit and a scattering isolating unit, wherein the ray generation unit is suitable for generating and emitting therapy radiation beam; the dose monitoring unit is used for measuring a dose of the radiation beam emitted by the ray generation unit in real time; the function unit is used for achieving at least one function of beam limiting, intensity modulation, flattening, shielding or filtering; the scattering isolating unit is covered on the outer surface of the function unit and is used for isolating the influences of scattering particles on radiation beam dose measurement in the dose monitoring unit, and the scattering particles are generated by a scattering function of the function unit on the radiation beam. By means of the above technical scheme, the accuracy of dose monitoring of an ionization chamber can be effectively improved, the structure is simple and convenience and practicality are achieved.

Description

technical field [0001] The invention relates to the technical field of medical equipment, in particular to a radiation head device of a linear accelerator. Background technique [0002] In existing linac radiation head devices, a dose monitoring unit such as an ionization chamber is a key component for dose monitoring. The dose monitoring unit not only needs to monitor whether there is radiation output in the irradiation field, but also needs to monitor the output dose, the flatness and symmetry of the radiation in the irradiation field and other technical indicators. Once it is found that the output dose or radiation parameters do not meet the requirements, it is necessary to stop the beam output immediately to protect the patient. Therefore, the measurement accuracy of the dose monitoring unit is the safety guarantee during the linear accelerator treatment. [0003] However, when the linac radiation head in the prior art is in different treatment modes (such as photon tr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/10A61N5/06
Inventor 刘艳芳李贵
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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