Light limiting device for radiation therapy device and radiation therapy device

Abstract

The invention discloses a light limiting device for a radiotherapy device. The light limiting device includes a blade collimation system, and the blade collimation system includes at least two layers of blade collimation devices. In the blade collimation system, there are at least two The moving axes of the layer blade collimating devices are perpendicular to each other. The beneficial effect of adopting this technical solution is: because at least two layers of blade collimation devices are included, windows of the same shape are adjusted according to requirements, and since the blades of at least two layers of blade collimation devices are perpendicular to each other, the leakage between the blades is blocked Rays, the leakage of rays is greatly reduced, and the penumbra area is also effectively reduced, so that the treatment can be accurately positioned, providing conditions for less fractionated, high-dose treatments, and the superimposed leaves make the rays that penetrate the leaves collimator Attenuation to a safe range improves the efficiency of equipment use and reduces medical costs and the burden on patients.

Description

technical field [0001] The invention relates to a medical device, in particular to a light-limiting device for a radiotherapy device and a radiotherapy device used in conjunction with an accelerator therapy instrument. Background technique [0002] When radiotherapy is performed on a tumor (target area), precise positioning of the tumor is required. In the 3D space, the doctor or physicist first scans the patient's CT images in the CT room, and reconstructs a series of CT images into a 3D image through an algorithm. At this time, the 3D coordinates of the tumor in the 3D image can be located. Then the doctor or physicist places the patient in the accelerator room for reset, and precisely coincides the three-dimensional coordinates of the tumor with the treatment isocenter of the accelerator. Finally start treatment. In order to protect healthy tissues from damage, current radiotherapy equipment generally uses custom-made shading plates or blade collimation devices IMRT wit...

AI Technical Summary

Problems solved by technology

In order to protect healthy tissues from damage, current radiotherapy equipment generally uses custom-made shading plates or blade collimation devices IMRT with adjustable through-hole shapes, because the rays emitted by the accelerator 1 are cone-shaped, such as figure 1 As shown, the penumbra 3 ≤ ± 4mm formed after passing through the shading plate or the blade collimation device 2, the penumbra 5 is still relatively large, which endangers healthy tissues. In order to reduce damage, only small doses of multiple exposures can be used The treatment plan is generally more than seven times, which greatly reduces the use efficiency of the equipment, reduces the treatment effect, and increases the treatment cost and the patient's burden

At the same time, due to the gaps between the blades of IMRT, radiation leakage is inevitable, causing damage to healthy tissues. In order to reduce the penumbra and leakage of the IMRT system, there are currently products that use a set of shading devices vertically superimposed on IMRT. , which is equivalent to setting an adjustable rectangular window above the IMRT, and the area covered by the shading plate overcomes the leakage, but because it can only be a rectangular window, it cannot completely match the window adjusted by the IMRT, and the shading plate cannot In the blocked rectangular window area, the leakage between the leaves still exists, and the penumbra area is still not effectively reduced

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