Realization of convolution superposition algorithm in graphics processing unit (GPU) acceleration dosage calculation

A dose and algorithm technology, applied in the field of dose calculation, can solve problems such as calculation time affecting application, inability to accurately simulate secondary ray distribution, and complex calculation.

Inactive Publication Date: 2011-09-28
SICHUAN UNIV
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AI Technical Summary

Problems solved by technology

The Monte Carlo algorithm is usually used as the standard for dose calculation, simulating the whole process of particle-matter interaction, and can calculate the dose distribution under various complex conditions, but the calculation is complex, time-consuming, and less clinically applied
The pencil beam algorithm only considers one-dimensional non-uniform correction, and cannot accurately simulate the distribution of secondary rays in non-uniform media, so it has a large error in calculating the dose distribution in non-uniform media
The differential convolution integral algorithm takes into account the three-dimensional non-uniform correction, and has high accuracy in the calculation of inhomogeneous tissues and complex structures, but the long calculation time affects the application of the differential convolution integral algorithm in the process of formulating treatment plans

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  • Realization of convolution superposition algorithm in graphics processing unit (GPU) acceleration dosage calculation
  • Realization of convolution superposition algorithm in graphics processing unit (GPU) acceleration dosage calculation

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Embodiment Construction

[0008] The dose calculation using the differential convolution integral algorithm can be divided into two parts. One is to calculate the energy TERMA (total energy released per unit mass) deposited by the interaction between the primary ray and matter in unit mass. The second is to perform convolution integration of TERMA and energy deposition kernel EDK (energy deposition kernel) to calculate the energy absorbed by each voxel. The principles of these two processes are described below.

[0009] The calculation of TERMA is carried out in the beam coordinate system, while the initial phantom obtained from the CT image is in the human body coordinate system. Before calculating TERMA, the initial phantom is rotated and interpolated to create a virtual phantom whose surface is perpendicular to the beam direction. Conducive to TERMA calculation. Known virtual phantom voxel coordinates , the corresponding coordinates in the initial phantom It can be expressed as:

[0010] ...

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Abstract

The invention provides realization of convolution superposition algorithm in graphics processing unit (GPU) acceleration dosage calculation, relating to dosage calculation in oncology radiotherapy. The convolution superposition algorithm is a common algorithm for photon beam dosage calculation, takes three-dimensional non-uniform correction into consideration, and has higher accuracy in calculation of non-uniform tissues and complex structures, but longer calculating time influences application of the algorithm in a process of making a treatment plan. The convolution superposition dosage calculation is realized by applying the GPU, and by adopting a central processing unit (CPU) and GPU combined processing mode, the operation time is shortened, the calculation efficiency is improved, and the convolution superposition algorithm becomes a daily dosage calculation algorithm.

Description

technical field [0001] The present invention relates to dose calculation in tumor radiotherapy, and specifically uses a GPU-accelerated differential convolution integral algorithm for dose calculation for regular fields, irregular fields and intensity-modulated fields in radiotherapy. Background technique [0002] Dose calculation is one of the core contents of the radiotherapy treatment planning system. Quickly and accurately providing data on the radiation dose in the region of interest is crucial to the formulation of radiotherapy plans. How to reduce the dose calculation time under the premise of ensuring the accuracy of dose calculation is a major bottleneck in radiotherapy planning. [0003] There are two main ways to increase the speed of dose calculation, one is to use different dose calculation methods, and the other is to use hardware with stronger computing power. At present, the dose calculation algorithms researched and used in radiotherapy are basically divide...

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G06F19/00
Inventor王先良侯氢吴章文勾成俊
OwnerSICHUAN UNIV