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Method for reducing influence of fixed-lead-door-field lead door in-place error on planned dose

A lead-gate, planned technology, applied in radiation therapy, X-ray/γ-ray/particle irradiation therapy, treatment, etc., can solve the problem of dose influence and so on

Active Publication Date: 2021-01-22
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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  • Method for reducing influence of fixed-lead-door-field lead door in-place error on planned dose
  • Method for reducing influence of fixed-lead-door-field lead door in-place error on planned dose

Examples

Experimental program
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Effect test

Embodiment 1

[0016] In this example according to Figure 1-2 , including the following steps: S1, determine which jaw needs to reduce the impact of the fixed jaw and field jaw in-position error on the planned dose, the jaw parallel to the MLC blade, the projection boundary is in the target area, in S1, determine which jaw The door needs to reduce the impact of the fixed jaw field jaw in-position error on the planned dose. In the process of positioning the static closed state position of the blade, that is, the state position where the blade is completely blocked by the jaw; S2. Select the fixed jaw to shoot the field jaw Possible value range of coordinates: the distance from the boundary of the jaw to the boundary of the static closed blade is greater than or equal to the accuracy error of the jaw in place. In S3, the blade below the jaw is customized as a static closed blade, so that the blade of the fixed jaw and the wild jaw are blocked In the scheme of static closure, optimize the virt...

Embodiment 2

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

Embodiment 3

[0020] In this example according to Figure 1-2, including the following steps: S1. Determine which jaw needs to reduce the impact of the fixed jaw and field jaw in-position error on the planned dose. The jaw parallel to the MLC blade and the projection boundary are in the target area. In S1, determine which jaw The door needs to reduce the impact of the fixed jaw field jaw in-position error on the planned dose. In the process of positioning the static closed state position of the blade, that is, the state position where the blade is completely blocked by the jaw; S2. Select the fixed jaw to shoot the field jaw Possible value range of coordinates: the distance from the boundary of the jaw to the boundary of the static closed blade is greater than or equal to the accuracy error of the jaw in place. In S3, the blade below the jaw is customized as a static closed blade, so that the blade of the fixed jaw and the wild jaw are blocked In the scheme of static closure, optimize the v...

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Abstract

The invention discloses a method for reducing the influence of a fixed-lead-door-field lead door in-place error on a planned dose. The method comprises the following steps: S1, determining which leaddoor needs to be subjected to processing of reducing the influence of the fixed-lead-door-field lead door in-place error on the planned dose; S2, selecting a coordinate possible value interval of a fixed-lead-door-field lead door; S3, customizing a blade below the lead door as a static closed blade, so that the blade for shielding the fixed-lead-door-field lead door is static and closed; and S4, setting a fixed-lead-door-field option system for reducing the influence of the fixed-lead-door-field lead door in-place error on the planned dose in a planning system. According to the method, a set value is used as an optimal value, a virtual coordinate value is used for calculation during calculation, and virtual coordinates are used as actual lead door coordinates when the plan is approved, thereby effectively solving the problem that the in-place error of the lead door with the fixed lead door field may block the motion projection blade to cause the change of a target dose.

Description

technical field [0001] The present invention relates to the technical field of methods for influence of jaw in-position error on dose, in particular to a method for reducing the influence of fixed jaw and jaw in-position error on planned dose. Background technique [0002] In recent years, with the rapid development of radiotherapy technology, the fixed field jaw technology has been more and more used in clinical practice. The fixed jaw technology can effectively reduce the low-dose irradiation of patients' normal tissues and ensure the dose coverage of the treatment target area. However, in the field of fixed jaws, there is often a jaw boundary parallel to the blade of the MLC directly above the target area. The positioning error of the jaw will cause changes in the width of the blade that the jaw blocks the projected rays, thereby affecting the dose. Dose cold spots and low-dose areas appear in PTV, which brings great uncertainty to the treatment and reduces the toleranc...

Claims

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Application Information

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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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