A fast calculation device and storage medium for radiotherapy dose of complex radiation field

Abstract

The invention belongs to the technical field of radiotherapy, and relates to a method, device and storage medium for fast calculation of the radiation dose of complex radiation fields. The method comprises the steps of: defining the parameters of the beam limiting device: gridding operation of the radiation field, distributing the calculation task of each grid to each calculation unit; performing dose calculation on particles; and then superimposing the dose of a single grid; Adjacent grids with the same weight after superimposition are merged and summed to obtain the dose under a single thread; finally, the doses of all single threads are summed to obtain the dose calculation result of the complex radiation field. The present invention divides the field plane of single-energy or multi-energy beams reaching the phantom or human body into multiple grids, and assigns equal or unequal numbers of grids to each parallel thread, thereby achieving the goal of not losing precision. Under the circumstances, the simulation calculation of the complex shot field can be performed quickly and efficiently; the calculation method of the present invention can also be transplanted to GPU or other parallel computing platforms.

Description

technical field [0001] The invention belongs to the technical field of radiotherapy, and relates to a method, device and storage medium for fast calculation of the radiation dose of complex radiation fields. Background technique [0002] In the field of radiotherapy technology, when using an accelerator to treat tumors, it is usually necessary to add a wedge-shaped filter to the beam path to change the dose distribution in the plain field (that is, without adding a wedge). The wedge-shaped plate is made of high-density materials, which can form the required distribution of the output dose of the radiation field to obtain a suitable prescription dose. Since it is impossible to measure the dose by implanting detectors in the patient's body during radiotherapy, the dose distribution in the patient's body can only be determined through complex theoretical calculations. Therefore, in the development of precise radiation therapy technology, the research on dose algorithm has a sp...

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Problems solved by technology

However, the beam of the accelerator is usually not monoenergetic, and often has an energy spectrum distribution; and the article does not mention how to realize the correction of the energy spectrum

[0006] "Method for Accurately Determining Radiation Field Output Dose in Conformal Radiation Therapy" (CN100431642 C) and "Method and Device for Generating Control Points of Dynamic Wedge Plate" (CN105105780 A) also only mention the use of mass in the case of wedge-shaped filters. Attenuation correction, using the method of grid division, still does not mention how to correct the situation of energy spectrum distribution

[0007] In addition, none of the above-mentioned methods mentioned how to perform parallel computing task allocation methods according to the number of grids and threads.

[0008] For the complex fields involved in the present invention, no fast calculation method has been seen so far. The method of the prior art is usually applied to the correction of the three-dimensional dose result by defining a two-dimensional weight plane. When performing three-dimensional dose calculation, the two-dimensional weight needs to be repeated. Fine-tuning, especially for the weights at the edges, requires a gradient weight mode, which is laborious and overly dependent on experience

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