Resolution Monte Carto dosage computing method

Abstract

The invention discloses a method for calculating dose by analyzing Monte-Carlo simulation. The method uses three-dimensional nonuniform correction to replace one-dimensional correction of the prior DSA method based on the prior DSA dose calculation model so as to improve the accuracy of calculation, uses energy fluence of a muon beam incident to the surface of a medium to calculate total kinetic energy of all depths instead of the prior DSA method for calculating the energy fluence of each depth separately to reduce the number of sampling points of each depth calculation so as to reduce the calculation time, and adopts different densities of calculating points according to different calculation areas, such as higher density of a calculating point of an interested area, and lower densities of calculating points of other areas, thereby reducing the calculation time while ensuring the accuracy of the area concerned by a user.

Description

technical field [0001] The invention relates to an analytical Monte Carlo dose calculation method in radiation dose measurement and calculation. Background technique [0002] Dose calculation methods are generally divided into analytical methods and Monte Carlo methods. The analytic method has the advantages of fast speed and high accuracy in uniform areas, but has large errors in non-uniform tissue areas; the Monte Carlo method can maintain high accuracy in all areas, but its application range is limited due to its time-consuming. [0003] The dose distribution array DSA (Dose Spread Array) obtained by Monte Carlo simulation can characterize the energy absorption ( dose). The DSA model can be used as an independent analytical Monte Carlo dose calculation method. [0004] When the traditional DSA model calculates the dose of non-uniform medium, it only considers the ratio of the electron density of the active cell and the average value of the electron density of each cell...

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Problems solved by technology

[0004] When the traditional DSA model calculates the dose of non-uniform medium, it only considers the ratio of the electron density of the active cell and the average value of the electron density of each cell on the line between the active cell and the deposition cell to correct the influence of non-uniform tissue on the dose distribution. , without fully considering the real situation of charged particles moving in the medium, that is, the charged particles do not completely move along the straight line between the action cell and the deposition cell

[0005] When the traditional DSA model calculates the medium dose, it needs to calculate the energy fluence at each depth separately, which is time-consuming

In addition, under the premise of uniform sampling point setting, it takes a long time to obtain a higher dose in the region of interest

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