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Rapid radiation dose calculation method and equipment for complex radiation fields and storage medium

A technology of fast computing and computing equipment, applied in the field of radiotherapy, can solve problems such as grid and thread number task allocation methods, energy spectrum distribution, and unseen problems, so as to reduce particle transport and deep penetration , the effect of fast and efficient calculation methods

Active Publication Date: 2019-07-09
BEIJING LINKING MEDICAL TECH CO LTD
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  • Claims
  • Application Information

AI Technical Summary

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

Method used

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  • Rapid radiation dose calculation method and equipment for complex radiation fields and storage medium
  • Rapid radiation dose calculation method and equipment for complex radiation fields and storage medium
  • Rapid radiation dose calculation method and equipment for complex radiation fields and storage medium

Examples

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Effect test

Embodiment 1

[0104] The irregular field (without JAWS) of embodiment 1MLC structure

[0105] This example shows irregular fields with MLC (eg figure 2 ), the method for fast calculation of radiation therapy dose, the irregular field is the isocentric field, including the following steps (such as image 3 shown):

[0106] (1) Define the parameter 110 of the beam limiting device MLC:

[0107] Read MLC parameters from DICOM, including MLC control point coordinates, openings, and MLC opening weights (snapshots) at different times; opening weights between two opposing MLC blades are optimized by TPS (radiation treatment planning system) Formed, the situation of leakage between chips is not considered in this embodiment;

[0108] (2) Field meshing operation:

[0109] A rectangular area that will contain the shape of the MLC opening (such as figure 2 Shown) Uniform gridding 121, the plane where the grid is located is the field plane;

[0110] Perform grid merging 122 on adjacent grids wit...

Embodiment 2

[0129] The irregular field of embodiment 2MLC and JAWS structure

[0130] This example shows the irregular shot field (such as Figure 5 ) rapid calculation method for radiotherapy dose, comprising the following steps:

[0131] (1) Define the parameters of the beam limiting device MLC and tungsten gate:

[0132] Read the parameters of MLC from DICOM, including the control point coordinates of MLC, the opening and the opening weight (snapshot) of MLC at different times, and the opening weight between two opposite MLC blades is optimized by TPS (Radiation Therapy Planning System) formed; the parameters of the tungsten gate include the coordinates of the tungsten gate; in this embodiment, the leakage between chips is not considered.

[0133] (2) Field meshing operation:

[0134] The opening shape formed by JAWS and MLC is uniformly gridded, and the plane where the grid is located is the field plane; grids are merged for adjacent grids with the same weight;

[0135] According ...

Embodiment 3

[0153] Embodiment 3 wedge-shaped field

[0154] A rapid calculation method for radiotherapy dose of complex radiation fields, such as Figure 6-9 Shown (beam limiting device in the present embodiment comprises wedge-shaped plate and JAWS), comprises the following steps:

[0155] (1) Define the parameter 210 of the wedge plate:

[0156] Define the parameters such as the material, density, placement position, and geometric dimensions of the wedge plate. The geometric dimensions of the wedge plate must ensure that the entire range of the radiation field is covered; the central axis of the wedge-shaped field is aligned with the central axis of the beam stream (such as Figure 7 shown);

[0157] (2) Field meshing:

[0158] Carry out grid operation on the shot field, and divide the shot field into several grids 221 according to self-definition; for example Figure 8 Shown is a field of size 10cm*10cm, which is divided into grids of 0.5cm*0.5cm, where Figure 8 The "+" in repres...

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Abstract

The invention belongs to the technical field of radiotherapy, and relates to a rapid radiation dose calculation method and equipment for complex radiation fields and a storage medium. The method includes defining parameters of a beam limiting device: preforming grid operation of a radiation field, and distributing calculation tasks of each grid to each calculation unit; preforming dose calculationon particles; then overlapping the dose of individual grids; merging and summing the overlapped adjacent grids with the same weight to obtain the dose under a single thread; and finally, summing thedose of all individual threads to obtain a dose calculation result of the complex radiation fields. According to the method, a single-energy or multi-energy beam reaches a radiation field plane of a phantom or a human body and divides the plane into a plurality of grids, and equal or unequal numbers of grids are assigned to each parallel thread, so that simulation calculation of complex radiationfields can be quickly and efficiently carried out without losing precision; and the calculation method can further be transplanted to GPU or other parallel calculation 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61N5/10
CPCA61N5/1031A61N2005/1034
Inventor 李强李贵
Owner BEIJING LINKING MEDICAL TECH CO LTD
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