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Multi-blade collimator

A multi-leaf collimator and blade technology, applied in the field of medical devices, can solve the problems of poor tumor conformity adjustment and single blade moving direction

Active Publication Date: 2015-08-12
SHANGHAI UNITED IMAGING HEALTHCARE
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Problems solved by technology

[0007] However, in the existing multi-leaf grating with a double-layer structure, the moving direction of the leaves in the two-layer leaf group is single, so there is a specific curvature for the periphery, and the conformity adjustment of the tumor with an irregular shape is poor.

Method used

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  • Multi-blade collimator
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  • Multi-blade collimator

Examples

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Embodiment Construction

[0046] As mentioned in the background art, the conformity of a multi-leaf collimator depends on the thickness and number of leaves of the multi-leaf collimator. Among them, the thinner the leaf and the more the number, the better the conformity of the multi-leaf collimator. However, the thinner and more the leaves are, the more difficult the manufacturing process of the leaf collimator is. For this reason, in the prior art, a double-layer multi-leaf grating structure is adopted. The double-layer multi-leaf grating structure includes two layers of blade components arranged perpendicular to the ray direction, each layer of blade components can form a radiation field of a specific shape, and two layers of different radiation fields are superimposed to form the final radiation field . Compared with the single-layer MLE structure, the conformity of the double-layer MLE is higher. However, due to the single moving direction of the leaves in the two-layer leaf group, the ability t...

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Abstract

The invention provides a multi-blade collimator, which comprises a first blade mechanism and a second blade mechanism installed on a main frame along a first direction, wherein the first blade mechanism includes a plurality of blades for forming a first radial field; a second blade mechanism includes a plurality of blades for forming a second radial field; the first blade mechanism rotates around a second axial direction; and at least parts of the projections of the first radial field and the second radial field overlap along the second axial direction. In the technical scheme above, the overlapped part, of the first radial field and the second radial field along the second axial direction, is the final radial field of the multi-blade collimator. The first blade mechanism can rotate around the second axial direction to allow the multi-blade collimator to adjust the shape of the overlapped part of the first radial field and the second radial field according to the shape required by a radiated part and through adjusting a rotation angle of the first blade mechanism. Therefore, the radial structure finally formed of the multi-blade collimator is adjusted, so that an adaptive shape degree of the radial filed of the multi-blade collimator is improved.

Description

technical field [0001] The invention relates to the field of medical instruments, in particular to a multi-leaf collimator. Background technique [0002] The collimator is a component of the radiation head of a medical radiation therapy instrument, including a primary collimator, a secondary collimator, and a multi-leaf collimator (or called a multi-leaf grating). [0003] refer to figure 1 As shown, the multi-leaf collimator is used to adjust the shape of the radiation field 12 formed by the radiation of the radiation source 10 . A multi-leaf collimator typically includes multiple pairs of leaves 11 arranged centrally around a radiation source 10 . For example, in the process of radiation tumor treatment, each blade 11 can move independently of each other perpendicular to the direction of the radiation generated by the radiation source 10, thereby forming a closed radiation field 12 simulated in the shape of a tumor, so as to prevent healthy tissues around the tumor from ...

Claims

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Application Information

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IPC IPC(8): G21K1/02A61N5/00
CPCA61N5/00G21K1/02G21K1/025
Inventor 张剑包光中刘剑
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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