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Calculation method and device of outgoing beam intensity for radiotherapy

A beam intensity, radiation therapy technology, applied in the directions of X-ray/γ-ray/particle irradiation therapy, etc., can solve the problems of slow solution speed and easy failure, and achieve the effect of reducing the impact and ensuring the speed advantage.

Active Publication Date: 2018-05-04
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a method and device for calculating the intensity of the outgoing beam of radiation therapy, so as to alleviate the problems of slow solution speed and easy failure of the quadratic programming problem in the optimization method of radiation therapy

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  • Calculation method and device of outgoing beam intensity for radiotherapy
  • Calculation method and device of outgoing beam intensity for radiotherapy
  • Calculation method and device of outgoing beam intensity for radiotherapy

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Embodiment Construction

[0045] In order to make the above objects, features and advantages of the present invention more comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0046] In the following description, many specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways than those described here, so the present invention is not limited by the specific embodiments disclosed below.

[0047] Optimizing volume-modulated radiation therapy (VMAT) and intensity-modulated radiation therapy (IMRT) plans by quadratic programming models is a common problem in modern radiation therapy planning. General optimization problems have the following nonlinear programming form:

[0048]

[0049] satisfy

[0050]

[0051] in,

[0052] t represents the dose distribution on each voxel;

[0053] Vector d is the average prescriptio...

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Abstract

The invention provides a method and device for calculating emergent beam intensity of radiotherapy. The method includes following steps: a, inputting a quadratic programming problem; b, pre-solving the quadratic programming problem; c, judging whether the quadratic programming problem is normal or not according to a pre-solving result, if yes, entering step d, and if not, entering step f; d, performing Mehrotra predictor-corrector iteration on the quadratic programming problem, preferentially using a Vanderbei strategy solving quasi-definite system, and when decomposition encounters a circumstance which is not positive definite, returning to use a symmetric indefinite decomposition solving augmentation system; e, performing post-processing; f, outputting a solution of the quadratic programming problem, wherein when the quadratic programming problem is normal, the solution of the quadratic programming problem is a value of a vector V, and when the quadratic programming problem is abnormal, the quadratic programming problem has no solution. By the method and device, the problem that solving of the quadratic programming problem in an optimization method of radiotherapy is low in speed and prone to failing can be solved.

Description

technical field [0001] The present invention relates to the field of radiotherapy, in particular to a method and device for calculating the intensity of outgoing beams of radiotherapy. Background technique [0002] Radiation therapy is a local treatment that uses radiation to treat tumors. Radiation includes α, β, γ rays produced by radioactive isotopes and X-rays, electron beams, proton beams and other particle beams produced by various X-ray therapy machines or accelerators. [0003] Quadratic programming problem models are widely used in modern radiotherapy planning. Quadratic programming is a special class of mathematical programming problems in nonlinear programming. In various radiation therapy types such as Volumetric Arc Radiation Therapy (VMAT) and Intensity Modulated Radiation Therapy (IMRT), quadratic programming problems can be used for flux map optimization, direct field optimization , to calculate the required exit beam intensity. [0004] To calculate the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61N5/10
Inventor 顾群
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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