A method to reduce the influence of fixed lead door and wild lead door position error on planned dose

A lead-and-planning technology that can be used in radiation therapy, X-ray/γ-ray/particle radiation therapy, treatment, etc., and can solve problems such as dose effects

Active Publication Date: 2022-07-19
靖江市人民医院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

③If the blade pair 1 is a static closed blade, and the blade pair 2 is a moving projection blade, at this time, if there is an error in the position of the jaw Y1, it may directly block the blade pair 2, which will affect the dose.

Method used

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  • A method to reduce the influence of fixed lead door and wild lead door position error on planned dose
  • A method to reduce the influence of fixed lead door and wild lead door position error on planned dose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this example, according to Figure 1-2 , including the following steps: S1, determine which lead gate needs to reduce the impact of fixed lead gate and wild lead gate position error on the planned dose, the lead gate parallel to the MLC blade, the projection boundary is in the target area, in S1, determine which lead gate The door needs to reduce the impact of the fixed lead door and the wild lead door position error on the planned dose. In the process of positioning the blade in the static closed state position, that is, the state position where the blade is completely blocked by the lead door; S2. Select the fixed lead door shooting field lead door. The range of possible coordinate values: the distance from the boundary of the lead door to the boundary of the static closed blade is greater than or equal to the precision error of the lead door in place. In S3, a blade under the lead door is customized as a static closed blade, so that the blade of the fixed lead door...

Embodiment 2

[0018] In this example, according to Figure 1-2 , including the following steps: S1, determine which lead gate needs to reduce the impact of the fixed lead gate and wild lead gate position error on the planned dose, the lead gate parallel to the MLC blade, the projection boundary is in the target area, in S1, determine which lead gate The door needs to reduce the impact of the fixed lead door and the wild lead door position error on the planned dose. In the process of positioning the blade statically closed state position, that is, the state position of the blade is completely blocked by the lead door; S2. Select the fixed lead door shooting field lead door. Coordinate value range: the distance from the boundary of the lead door to the boundary of the static closed blade is greater than or equal to the accuracy error of the lead door in place. In S3, a blade under the lead door is customized as a static closed blade, so that the blade of the fixed lead door and the wild lead d...

Embodiment 3

[0020] In this example, according to Figure 1-2, including the following steps: S1, determine which lead gate needs to reduce the impact of fixed lead gate and wild lead gate position error on the planned dose, the lead gate parallel to the MLC blade, the projection boundary is in the target area, in S1, determine which lead gate The door needs to reduce the impact of the fixed lead door and the wild lead door position error on the planned dose. In the process of positioning the blade in the static closed state position, that is, the state position where the blade is completely blocked by the lead door; S2. Select the fixed lead door shooting field lead door. The range of possible coordinate values: the distance from the boundary of the lead door to the boundary of the static closed blade is greater than or equal to the precision error of the lead door in place. In S3, a blade under the lead door is customized as a static closed blade, so that the blade of the fixed lead door ...

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Abstract

The invention discloses a method for reducing the influence of the in-position error of the fixed lead gate and the wild lead gate on the planned dose. ; S2, select the range of possible values ​​for the coordinates of the fixed lead door and the shooting field lead door; S3, customize a blade below the lead door as a static closed blade, so that the blade blocking the fixed lead door and the wild lead door is statically closed; S4, set The reduction of the fixed jaw shot field in the planning system is an option system that affects the planned dose due to the in-position error of the fixed jaw field. The virtual coordinates are used as the actual jaw coordinates, which effectively solves the problem that the in-position error of the fixed jaw shooting field may cause the change of the target dose to block the moving projection blades.

Description

technical field [0001] The invention relates to the technical field of the method for influencing the dose due to the in-position error of the jaw, in particular to a method for reducing the influence of the in-position error of the fixed jaw and wild jaw on the planned dose. Background technique [0002] In recent years, with the rapid development of radiotherapy technology, the fixed lead gate technology is more and more used in clinical practice. The fixed lead gate technology can effectively reduce the low dose irradiation of normal tissues of patients and ensure the dose coverage of the treatment target area. However, in the fixed jaw field, there is often a jaw border parallel to the MLC blade directly above the target area. The in-position error of this jaw will cause the jaw to change the blade occlusion width of the projected ray, thereby affecting the dose, making Dose cold spots and low-dose areas appear in PTV, which brings great uncertainty to the treatment and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61N5/10
CPCA61N5/103A61N5/1048A61N2005/1092A61N2005/1094
Inventor 石江伟金建华汪德文范丽华石江涛
Owner 靖江市人民医院
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