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Electron linear accelerator source model building method and building device

A technology for a linear accelerator and a method for establishing a linear accelerator is applied in the field of establishing a source model of an electron linear accelerator, and can solve problems such as the inability to obtain an electron linear accelerator model.

Active Publication Date: 2016-04-06
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0005] The problem solved by the embodiments of the present invention is to provide a high-precision source model establishment method when the electron linear accelerator model cannot be obtained

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  • Electron linear accelerator source model building method and building device
  • Electron linear accelerator source model building method and building device
  • Electron linear accelerator source model building method and building device

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Embodiment Construction

[0026] The Monte Carlo dose calculation method is a method for accurately calculating the dose. Since the output parameters of each electron linear accelerator will not be exactly the same, it is necessary to model each electron linear accelerator. By continuously modifying the parameters in the model, Make the calculated dose value equal to the actual measured dose value. In the case that the electron linear accelerator model cannot be obtained, the dose calculation can only be performed by establishing a virtual accelerator model.

[0027] In the prior art, the Monte Carlo method is often used to establish a virtual source model, and a radioactive source is generated by superimposing multiple Gaussian sources through forward simulation. However, there are large errors in the dose calculated by the existing Monte Carlo virtual source model.

[0028] In the embodiment of the present invention, the corresponding phase space files are generated by using electron beams of differ...

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Abstract

The invention discloses an electron linear accelerator source model building method and a building device. The method comprises steps: physical parameters of an initial virtual phase space source are acquired, the physical parameters are adopted for three-dimensional dose curve simulation, and the obtained three-dimensional dose curve through simulation and a three-dimensional dose curve measured by the electron linear accelerator are compared; when differences exist between the two, the physical parameters of the initial virtual phase space source are adjusted until the error between the obtained three-dimensional dose curve through simulation and the measured three-dimensional dose curve is in a preset range; and electron beams with different single energy and different beam spot sizes are pre-calculated, phase space files with different weights generated by a simulation reference accelerator machine head model, and the files are overlapped to generate the initial virtual phase space. By adopting the method and the device of the invention, in a condition of not acquiring the electron linear accelerator model, a high-precision source model building method is provided.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a method and device for establishing a source model of an electron linear accelerator. Background technique [0002] A medical linear accelerator is a biomedical particle accelerator device used for radiotherapy of tumors. At present, electron linear accelerators are the most widely used in radiation therapy in the world. [0003] The Monte Carlo dose calculation method is a method for accurately calculating the dose. Since the output parameters of each electron linear accelerator will not be exactly the same, it is necessary to model each electron linear accelerator. By continuously modifying the parameters in the model, Make the calculated dose value equal to the actual measured dose value. [0004] The Monte Carlo calculation method described above is applicable when an electron linac model can be obtained. In the case that the electron linear accelerator model cannot be ob...

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Application Information

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IPC IPC(8): A61N5/10
Inventor 李贵刘艳芳刘娟
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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