Optimization Method of Virtual Source Model of Linear Accelerator
A linear accelerator and optimization method technology, applied in the field of medical devices, can solve problems such as complex methods, differences, and different virtual source distributions, and achieve the effect of simplifying the process
Active Publication Date: 2018-05-04
SHANGHAI UNITED IMAGING HEALTHCARE
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[0005] There are many ways to establish the Monte Carlo source model of the existing medical electron linear accelerator, one of which is to use the virtual source model method, using multiple virtual sources to simulate the real source, but due to the distribution of the virtual source and the actual source The distribution is not the same, and there is a big difference between the virtual source model method and the actual source
[0006] In the prior art, when using the virtual source model method, the distribution of particle fluence and energy in space are considered separately, and the distribution of particle density in the radial direction and the softening effect of energy in the radial direction are corrected. The energy separation correction process introduces too many commissioning parameters, so the existing methods are too complicated and imprecise
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[0036] There are many methods for optimizing the Monte Carlo source model of the existing medical electron linear accelerator, one of which is to use the virtual source model method, which uses multiple virtual sources to simulate the real source, but due to the distribution of the virtual source and the actual source The distribution is not the same, and the virtual source model method is quite different from the actual source. The invention belongs to a virtual source model method.
[0037] In the virtual source model, the particles that contribute to the dose are divided into three different sources: initial photon source, scattered photon source and electron source. Such as figure 1 As shown, the initial photon source is located at the target point where electrons are incident in the accelerator. It is used to represent the photons generated by the bremsstrahlung after the electron beam hits the target. This is the main component of the photon source; the scattered photon sou...
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The invention relates to a virtual source model optimizing method of a linear accelerator. The method comprises the following steps of inputting configuration parameters of the linear accelerator into a Monte Carlo virtual source model; obtaining dose distribution data of the linear accelerator under the configuration parameters, wherein the configuration parameters include a first open field specification; sampling the dose distribution data to be used as photon flux spatial distribution of a primary photon source; after the first open field specification in the configuration parameters is regulated to be smaller than a second open field specification, measuring the dose distribution data of the linear accelerator under the configuration parameters through a water box; after the first open field specification in the configuration parameters is regulated to be smaller than the second open field specification, performing simulation calculation by the virtual source model according to the configuration parameters to obtain the dose distribution data; regulating partial parameters of the virtual source model until the errors of the dose distribution data obtained through simulation calculation and the dose distribution data measured by the water box are in the preset range.
Description
Technical field [0001] The invention relates to the field of medical equipment, and in particular to an optimization method of a virtual source model of a linear accelerator. Background technique [0002] Medical linear accelerator is a kind of particle accelerator device used in biomedicine for radiotherapy of tumors. At present, linear accelerators are the most used in radiotherapy internationally. [0003] Due to the production process and working environment, for example, the installation location of the various components of the linear accelerator, the temperature and humidity of the environment, and the wear of the instrument, the output parameters of each electron linear accelerator, such as energy spectrum, beam spot size, scattering The proportions of particles are not exactly the same. This requires modeling of each electron linear accelerator. By continuously modifying the parameters in the model, the calculated three-dimensional dose distribution is in error with the a...
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IPC IPC(8): G16H50/50
CPCG16H50/50
Inventor 姬长胜李贵
Owner SHANGHAI UNITED IMAGING HEALTHCARE