Method and device for source compression and decompression

Abstract

The present invention provides a source compression and decompression method, comprising: compressing particle information of the source to generate a compressed source and storing it; regenerating particles from the stored compressed source. The invention greatly reduces the storage space of the source by extracting the distribution parameters of the particles along the radial direction, and is convenient for the Monte Carlo program to read the source. Furthermore, since the distribution parameters of the particles fully reflect the state of the particles in the source, the accuracy of the compressed source is improved, and the source can be adjusted by adjusting the distribution parameters of the particles, which is more convenient to match with different treatment heads (Commission).

Description

technical field [0001] The present invention generally relates to the field of radiotherapy dose calculations, and more particularly to the compression and processing of sources in the calculation of dose distribution using the Monte Carlo method. Background technique [0002] At present, the Monte Carlo method is widely used in medical dose calculation and verification. Dose calculation using the Monte Carlo method, whose calculation accuracy is close to the real measured value, is generally considered the "gold standard" in dose calculation. Due to the long calculation time required by the Monte Carlo method, its application in clinical radiation therapy is hindered. With the development of computer hardware technology, especially the emergence of graphics processing unit (GPU), the calculation time required by the Monte Carlo method has been greatly shortened. [0003] figure 1 An example of the physical structure of a photon ray source is given in . From figure 1 It...

AI Technical Summary

Problems solved by technology

[0008] 1. The fan-shaped area is too large, such as taking 1 / 4 of the original source area, the compression accuracy can be improved, but the compression ratio is reduced, and the compression effect cannot be achieved

[0009] 2. If the fan-shaped area is too small, the compression ratio is guaranteed, but the compression accuracy is not enough

If you want to improve the compression accuracy, you need to increase the number of particles, and if you want to increase the compression ratio, you need to reduce the number of particles, so the compression accuracy and compression ratio cannot be improved at the same time

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