Method and device for obtaining beam energy spectrum, and dose distribution calculating method

A technology of dose distribution and energy spectrum distribution, which is applied to X-ray energy spectrum distribution measurement, radiation measurement, measurement devices, etc. problem, to achieve the effect of convenient automatic operation, improved accuracy and high calculation efficiency

Active Publication Date: 2016-08-17
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

However, the energy spectrum obtained by Monte Carlo simulation does not fit the measured data very well in the CC algorithm. For example, when the calculated value curve intersects with the measured curve at a certain position in the drop zone, at this time, without adjustin

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  • Method and device for obtaining beam energy spectrum, and dose distribution calculating method
  • Method and device for obtaining beam energy spectrum, and dose distribution calculating method
  • Method and device for obtaining beam energy spectrum, and dose distribution calculating method

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Embodiment Construction

[0059] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0060] For the beam emitted by the medical electron linear accelerator, it is composed of bremsstrahlung photons produced by electrons of a certain energy hitting the target in the treatment head, and the energy spectrum of bremsstrahlung photons is very wide, ranging from low energy to high energy. Yes, the dose distribution of the beam in the human body cannot be accurately determined without knowing the spectral distribution of the photons.

[0061] The present ...

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Abstract

The invention discloses a method for obtaining a beam energy spectrum, and the method comprises the steps: setting the initial energy spectrum distribution of a beam; calculating the dose distribution on a central axis of the beam based on the initial energy spectrum distribution; judging whether a calculated depth value of a maximum dose place and the dose value of the maximum dose place are matched with the measurement value of dose distribution on the central axis of the beam or not: enabling the current energy spectrum distribution to serve as the energy spectrum distribution of the beam if the calculated depth value and the dose value are matched with the measurement value, or else, adjusting the current energy spectrum distribution, and calculating the dose distribution on the central axis of the beam based on the adjusted energy spectrum distribution till the calculated depth value and the dose value are matched with the measurement value. The method is simple and effective.

Description

technical field [0001] The invention relates to the field of medical equipment, in particular to a method for obtaining the beam energy spectrum of a medical electron linear accelerator. Background technique [0002] It is well known that radiation therapy is one of the most important and basic means of tumor treatment. In order to improve the cure rate of tumors, it is required to accurately deliver high-dose beams to the target area (tumor) and minimize damage to surrounding normal tissues. Therefore, it is necessary to accurately calculate the dose distribution of beams when formulating radiation therapy plans. [0003] The photon beam dose calculation method based on the convolution / superposition model (also known as the Collapsed Cone dose calculation method, referred to as the CC algorithm) can obtain a higher-precision dose distribution, but it needs to be based on the beam energy spectrum generated by the medical electron linear accelerator. For calculation, only th...

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Application Information

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IPC IPC(8): G01T1/36G01T1/29
CPCG01T1/2914G01T1/36
Inventor 万天敏
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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