Double-layer multi-leaf collimator

Abstract

The invention relates to a double-layer multi-leaf collimator. The double-layer multi-leaf collimator comprises a plurality of driving rods, a plurality of driving motors, a first leaf group and a second leaf group, wherein the first leaf group comprises multiple first leaves, the second leaf group comprises multiple second leaves, the multiple first leaves and the multiple second leaves are distributed annularly, the first leaves and the second leaves are cuboid and connected with the driving motors through the driving rods respectively, the width of the first leaves is 2.5 mm, and the width of the second leaves is 1.25 mm. The multi-leaf collimator can improve the radiation accuracy of a radiation field and can be combined into different shapes freely to adapt to different tumor areas. Accordingly, on one hand, tumor can be effectively killed, and on the other hand, other healthy cells can be prevented from being injured.

Description

technical field [0001] The invention relates to a double-layer multi-leaf grating. Background technique [0002] The X-rays currently used in medical electron linear accelerators form radiation fields under the action of multi-leaf gratings, and perform radiation therapy on the lesion area, killing the lesion cells and tissues, and achieving therapeutic effects. While it is required to achieve therapeutic effects, it is also required to have high resolution and radiation accuracy to avoid damage to other normal tissues outside the lesion area. [0003] At present, most of the multi-leaf grating systems are single-layer, the thickness of the grating blades is 2.5mm, and the projection width of the radiation field is 5mm, and the radiation accuracy of the radiation field of the combined multi-leaf grating is relatively low. [0004] Chinese patent CN2445754Y discloses a double-layer multi-leaf collimator, which achieves the effect of eliminating penumbra through double-layer ...

AI Technical Summary

Problems solved by technology

However, the radiation field formed by the multileaf grating with the above structure can only be rectangular, but the tumor area is not necessarily rectangular, and the size of the rectangle is fixed, but the size of the tumor area varies from person to person

[0005] In addition, although the blades of the above-mentioned multi-leaf grating are all side trapezoidal, the sizes of the blades at different positions in the same layer are different. If a blade is damaged, it is necessary to find a blade of the corresponding shape and size to replace it, which is very inconvenient

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