Interpolation algorithm for intensity-modulated radiation therapy plan dose data based on gradient features

An intensity-modulated radiation therapy and interpolation algorithm technology, which is applied in special data processing applications, calculations, electrical digital data processing, etc., can solve problems such as misleading judgments of doctors and physicists, large calculation errors, and loss of gradient information, etc. The effect of small gradient edge points, improving calculation accuracy, and overcoming smoothing effect

Inactive Publication Date: 2016-03-09
SICHUAN UNIV
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Problems solved by technology

[0007] Among them, u and v are the distances between the point to be interpolated and the point (i, j) in the horizontal direction and the vertical direction respectively; however, in order to achieve a better therapeutic effect and protect normal tissues at the same time, intensity-modulated radiation therapy generally places a distance between the lesion area and A large dose gradient is formed between normal areas, so there are often more gradient edge points in

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  • Interpolation algorithm for intensity-modulated radiation therapy plan dose data based on gradient features
  • Interpolation algorithm for intensity-modulated radiation therapy plan dose data based on gradient features
  • Interpolation algorithm for intensity-modulated radiation therapy plan dose data based on gradient features

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[0048] figure 2 The flow chart of the interpolation algorithm of the dose data of the intensity-modulated radiation therapy plan based on the gradient feature of the present invention is shown. This embodiment is described in detail according to this flow chart. The specific steps are as follows:

[0049] (1) Calculation of the gradient and gradient modulus on the dose plane of the intensity-modulated radiotherapy plan

[0050] Read the intensity-modulated radiation therapy planning dose data plane I generated by the intensity-modulated radiation therapy planning system L , for each point (i, j) on the dose data plane of the intensity-modulated radiation therapy plan, the gradient ▽I in the horizontal direction can be known from the traditional gradient expression Lx and the gradient ▽I in the vertical direction Ly , represented by the following formula (4) (Zhang Guangjun, "Machine Vision" Science Press: 2005.):

[0051] ▽I Lx =I L (i+1,j)-I L (i,j)

[0052] (4)

[0...

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Abstract

The invention relates to an interpolation algorithm for intensity-modulated radiation therapy plan dose data based on gradient features, belonging to the technical field of intensity-modulated radiation therapies. The interpolation algorithm comprises the following steps: obtaining various gradient edge points and non-gradient edge points on an intensity-modulated radiation therapy plan dose data plane by adopting an improved traditional Canny algorithm according to gradient features of the intensity-modulated radiation therapy plan dose data plane; obtaining a coefficient of a bicubic interpolation kernel corresponding to each point on the intensity-modulated radiation therapy plan dose data plane according to the acutance of a gradient profile corresponding to the obtained gradient edge points and the deviation coefficient corresponding to the non-gradient edge points; and performing bicubic interpolation of each point to be interpolated by using the coefficient of the bicubic interpolation kernel so as to obtain the intensity-modulated radiation therapy plan dose data of each point to be interpolated. The interpolation algorithm disclosed by the invention overcomes the smoothing effect of the traditional bilinear interpolation while the error is reduced; and the original gradient information is reserved.

Description

technical field [0001] The invention relates to a processing method for intensity-modulated radiation therapy planning dose data, in particular to an interpolation algorithm for intensity-modulated radiation therapy planning dose data based on gradient features, and belongs to the technical field of intensity-modulated radiation therapy. . Background technique [0002] Intensity Modulated Radiation Therapy (IMRT) dose verification is an important guarantee for the reliability of radiation therapy plans, and the accuracy of dose verification is of great significance to the effect of radiation therapy and the safety of patients. The basic principle of dose verification is to use DD (DoseDifference), DTA (DistanceToAgreement), Gamma factor and other dose verification methods to compare the treatment planning system (TreatmentPlanSystem, TPS) with the prepared treatment plan. The calculated dose data of the intensity-modulated radiotherapy plan and the measured dose data obtain...

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Application Information

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IPC IPC(8): G06F19/00
CPCG06F19/3468
Inventor 翟磊黄宁范轶翔吴庆星夏翔王鹏
Owner SICHUAN UNIV
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