Three-dimensional correction method for pencil beam dose calculation in case of lung radiotherapy

A technology of pencil beam and radiotherapy planning system, which is applied in the field of radiotherapy, can solve problems such as inability to improve the radiotherapy planning system, fail to meet clinical needs, and long calculation time, so as to facilitate implementation, improve effect, improve correction ability and accuracy Effect

Active Publication Date: 2015-03-04
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

However, this method has the problem of long calculation time and cannot meet the clinical needs.
Although many researchers use multi-thread acceleration or GPU hardware acceleration to increase the cal

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  • Three-dimensional correction method for pencil beam dose calculation in case of lung radiotherapy
  • Three-dimensional correction method for pencil beam dose calculation in case of lung radiotherapy
  • Three-dimensional correction method for pencil beam dose calculation in case of lung radiotherapy

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[0051] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0052] The three-dimensional correction scheme for pencil beam dose calculation in lung radiotherapy provided by the embodiment of the present invention is especially suitable for the case where the CT value of lung tissue varies greatly and there are multiple CT values ​​around the CT cell.

[0053] figure 1 It is a flowchart of a three-dimensio...

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Abstract

The invention discloses a three-dimensional correction method for pencil beam dose calculation in the case of lung radiotherapy, which comprises steps: first CT (Computed Tomography) data of a healthy human lung are acquired; the first CT data are converted into phantom data for calculation of a Monte Carlo calculation program; absorbed doses of the phantom data are calculated and a corresponding feature array is acquired; different weights are given to elements in the feature array according to an adjacent relationship with a central element; coding is carried out on the feature arrays; second CT data of a tumor patient lung are calculated by using pencil beam algorithm in a radiotherapy planning system, dose information is extracted from a dose file derived from the radiotherapy planning system, and a three-dimensional dose array is built by the extracted dose information; coding is carried out on the three-dimensional dose array; the coded three-dimensional dose array corresponds to the coded feature array, and a mapping relationship is built; and a convolution formula with weights and the mapping relationship are used for carrying out convolution processing on the three-dimensional dose array, and a corrected pencil beam three-dimensional dose array is obtained.

Description

technical field [0001] The invention relates to the technical field of radiotherapy, in particular to a three-dimensional correction method for pencil beam dose calculation in lung radiotherapy. Background technique [0002] Most of the existing radiotherapy planning systems use the analytical dose calculation method, but the biggest problem with the analytical dose calculation method is the inaccurate calculation of energy deposition in inhomogeneous tissues. The ray direction is corrected one-dimensionally. In particular, the pencil beam dose calculation method has a significant error in the dose calculation of the beam edge and the area where the value of computer X-ray tomography (Computed Tomography; CT) changes greatly. However, because the pencil beam algorithm is particularly suitable for the reverse optimization algorithm of the current intensity-modulated conformal radiotherapy, it can significantly improve the speed of optimization, so both research institutions ...

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Application Information

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IPC IPC(8): A61N5/00
Inventor 徐公明曹瑞芬陈朝斌胡丽琴吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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