Method for automatic centering control of medical accelerator beam

An automatic centering and control method technology, applied in the direction of X-ray/γ-ray/particle irradiation therapy, etc., can solve the problem of inability to guarantee high-quality dose uniformity requirements in the treatment field, strong electromagnetic interference in the working environment, and dose uniformity disturbances, etc. problems, to achieve the effect of easy realization, good reliability and improved uniformity

Active Publication Date: 2017-05-31
江苏海明医疗器械有限公司
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Problems solved by technology

At present, the requirements for dose uniformity in the treatment field of medical accelerators are getting higher and higher. However, the existing accelerators have complex structures and st...

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  • Method for automatic centering control of medical accelerator beam
  • Method for automatic centering control of medical accelerator beam
  • Method for automatic centering control of medical accelerator beam

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Embodiment Construction

[0025] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0026] The invention provides an automatic centering control method of a medical accelerator beam, which uses the designed control system to automatically calculate and automatically adjust the symmetry and uniformity of the dose of a medical electron linear accelerator, and can quickly and effectively realize the centering of the accelerator beam. Centering improves the uniformity of the dose in the treatment field and has good reliability.

[0027] The control system includes an X-direction control subsystem and a Y-direction control subsystem; the two control subsystems are independent of each other; wherein, the X and Y directions are respectively: two mutually perpendicular beam cross-sections with the beam center as the origin direction. The composition of the X-direction control subsystem and the Y-direction control subsystem is the same, including...

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Abstract

The invention discloses a method for automatic centering control of a medical accelerator beam. The method can be used for automatic computation and automatic adjustment of the symmetry degree and the uniformity of dosage of a medical electron linear accelerator. A designed ionization chamber is adopted for acquiring a medical accelerator beam signal and a deviation beam signal in the X direction or the Y direction, then a dosage rate symmetry error value between two symmetrical sub-ionization chambers is calculated, and the current orientation power supply value is obtained according to the dosage rate symmetry error value and an ideal orientation power supply value of an output orientation power supply; and then the position of the medical accelerator beam is adjusted and the dosage rate symmetry error is corrected by changing the medical accelerator output orientation power supply. In this way, the requirement for uniformity of the medical accelerator beam in the treatment field is met. Centering of the accelerator beam can be achieved quickly and effectively, and dosage uniformity in the treatment field is improved, and reliability is high.

Description

technical field [0001] The invention relates to the technical field of electron linear accelerators for medical and industrial irradiation applications, in particular to an automatic centering control method for medical accelerator beams. Background technique [0002] The task of radiation therapy is to select, design and implement the best treatment plan according to the lesions of each patient. Such a plan mainly includes the size and direction of the treatment field, the dose contribution of each target area, and fractional treatment of the total prescribed dose. Therefore, it is necessary to automatically control the target position of the beam output by the accelerator, so as to ensure that the output dose meets the uniformity requirement in the treatment field. At this stage, the requirements for dose uniformity in the treatment field of medical accelerators are getting higher and higher. However, the existing accelerators have complex structures and strong electromag...

Claims

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Application Information

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IPC IPC(8): A61N5/10
Inventor 柘江吴建兴陈璞王春波柏磊
Owner 江苏海明医疗器械有限公司
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