Sampling method and optimization method of radiotherapy plan

A sampling point and self-adaptive sampling technology, which is applied in the direction of medical automatic diagnosis, calculation, computer-aided medical procedures, etc., can solve the problems of influence and cannot guarantee the optimization effect of sampling points in unsampled areas, so as to improve the uniformity, Improve the performance of the optimization effect

Active Publication Date: 2017-03-15
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0007] However, due to the flaws of the sampling algorithm, although the optimization algorithm can control the dose at the sampling point with high weight very well, it cannot guarantee that the unsampled area also has the optimization effect at the sampling point
[0008] On the other hand, if the number of sampling points in the region of interest is much smaller than the number of sampling points in other regions of interest, a sufficiently large weight coefficient will be required to make the dose difference of the sampling points in the region of interest more accurate to the target function value affects

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  • Sampling method and optimization method of radiotherapy plan
  • Sampling method and optimization method of radiotherapy plan
  • Sampling method and optimization method of radiotherapy plan

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[0034] 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.

[0035] Many specific details are set forth in the following description to facilitate a full understanding of the present invention, but the present invention can also be implemented in other ways than described here, so the present invention is not limited by the specific embodiments disclosed below.

[0036] In radiation therapy, high doses of radiation are required to be delivered to the tumor target area as much as possible to minimize the damage to organs at risk. Therefore, when formulating radiation therapy plans, the region of interest includes the tumor target area and organs at risk, and the dose in the tumor target area is required to be as high as possible, and the dose in the organs at risk is required to be as low as possi...

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Abstract

The invention provides a sampling method. The sampling method comprises the following steps of: acquiring the weights of all regions of interest and the upper limit of the total quantity of sampling points; determining the target quantity of the sampling points of all the regions of interest according to the weights and the upper limit of the total quantity of the sampling points; and carrying out sampling on all the regions of interest according to the target quantity of the sampling points. The sampling method provided by the invention has the advantages that the coincidence between an iterative optimization result and a final dosage calculation result can be better.

Description

technical field [0001] The invention relates to the field of radiation therapy, in particular to a method for sampling an area of ​​interest and a method for optimizing a radiation therapy plan. Background technique [0002] Radiation therapy is a method to treat malignant tumors by using radiation such as 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] Due to the high energy of the beam, normal cells are also affected while tumor cells are killed. Radiation therapy is planned in order to minimize damage to normal tissue. In order to reduce the time for radiotherapy plan formulation, the Region of Interest (ROI for short, which can be the tumor target area or organ at risk) is generally sampled first, and the treatment planning system (Treatment Planning System, TPS for short) is iteratively optimized In the process, the dose calculation is o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
CPCG16H50/20
Inventor 张康
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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