Method for determining distribution of electron beam dosage

An electron beam dose and electron beam technology, which is applied in electrotherapy, electrical digital data processing, diagnostic recording/measurement, etc., can solve a lot of measurement data, a large amount of calculation time, limited application and other problems, and achieve high calculation accuracy and measurement data. The effect of less and faster calculation speed

Inactive Publication Date: 2007-07-18
SICHUAN UNIV
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  • Description
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Problems solved by technology

In order to obtain the required calculation accuracy, these two algorithms require a large amount of calculation time, which limits their clinical application
The analytical algorithm is developed on the basis of the Fermi-Eyges multiple scattering theory, such as the pencil beam model PBRA (Electron pencil-beam redefinition algorithm), but this method requires a lot of measurement data in use

Method used

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  • Method for determining distribution of electron beam dosage
  • Method for determining distribution of electron beam dosage
  • Method for determining distribution of electron beam dosage

Examples

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example 1

[0059] Example 1: Irregular Surface

[0060] The measurement data of this example is quoted from the ECWG (High Energy Electron Beam Therapy Planning Joint Working Group:

[0061] Collaborative Working Group contract on high energy electron bean treatment planning) experiment. In this experiment, the outer surface of the human body is simulated to have a steep step-shaped change in the irradiation field (such as the jaw) using stepped solid water. In this example, under the irradiation conditions of 100cmSSD and 15cm×15cm radiation field, the dose distribution of 20MeV electron beam irradiation in stepped solid water is calculated, as shown in Figure 2. Fig. 1 has provided the comparison of the isodose curve on the plane 1cm away from the central plane, the dot is the measurement data of ECWG, and the solid line is the measurement data of the method of the present invention.

example 2

[0062] Example 2: Irregular shot field

[0063] The measured data of this example refer to the experiment of ECWG. In this experiment, a "room-shaped" irregular field was designed, as shown in Figure 4. In this field there is a long and narrow addition (chimney-like) and a triangular-shaped addition (roof-like) near the central axis, see Figure 5. This example calculates the comparison of isodose lines on the BEV plane at a depth of 6.1cm below the surface of the water tank under the irradiation conditions of 100cmSSD and 15cm×15cm field of radiation of 20MeV electron beam. The dots are the measurement data of ECWG, and the solid line is the material data of the method of the present invention, as shown in FIG. 3 .

[0064] The above-described embodiment illustrates that the electron beam distribution result measured according to the present invention and the ECWG measurement result, that is, the error of the actual distribution result of the electron beam dose is small, wit...

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Abstract

A method for determining the dose distribution of electronic beam includes such steps as using CT to measure the electronic density array of the irradiated object, measuring and recording the initial lateral parameters of electronic beam, its energy spectrum and the source-skin distance, debunching the irradiating electronic beam into an electronic microbeam array, calculating the 3D dose distribution of each microbeam in irradiated object, and adding all the electronic microbean arrays to obtain a 3D dose distribution array of an electronic beam in irradiated object.

Description

technical field [0001] The invention relates to a method for determining the dose distribution of electron beams, in particular to a method for accurately determining the three-dimensional dose distribution of electron beams in an irradiated medium in electron beam external irradiation radiotherapy. Background technique [0002] At present, relatively mature tumor treatment methods include surgery, radiation therapy and chemotherapy. Among them, radiation therapy accounts for a considerable proportion. Radiation therapy is especially suitable for local tumors with a certain shape. The prerequisite for radiotherapy is to determine the location of the tumor and determine the extent of the tumor. This can be provided by technical means such as computed tomography (CT), nuclear magnetic resonance (NMR) or positron emission tomography (PET) to provide three-dimensional anatomical information of the patient. On this basis, the doctor determines the tumor volume (CTV) and sensit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/00G06F17/00A61N1/00
Inventor 勾成俊罗正明吴章文杨代伦
Owner SICHUAN UNIV
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