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

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...

AI Technical Summary

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 the intensity-modulated radiation therapy planning dose data, and the traditional bilinear interpolation cannot correctly process these gradients due to the smoothing effect of its algorithm itself edge, which will cause large calculation errors, and make the dose data distribution of the entire intensity-modulated radiation therapy plan tend to be smooth and lose the original gradient information, which will mislead the judgment of the treating doctor and physicist

Images