Light limiting device for radiotherapy device and radiotherapy device

Abstract

The invention discloses a light limiting device for a radiotherapy device. The light limiting device comprises a blade collimation system comprising at least two layers of blade collimation devices. Moving axes of the blade collimation devices of the blade collimation system are perpendicular. By means of the technical scheme, the light limiting device has the advantages that due to the fact that the light limiting device comprises the blade collimation devices, windows with the same shape are adjusted according to requirements, blades of the blade collimation devices are perpendicular and shield irradiating leakage rays among the blades, irradiating leakage of the rays is greatly reduced, a penumbra field is effectively reduced, the treatment can be accurately positioned, conditions are provided for small-gradation and large-dose treatment, the rays penetrating through the blade collimation devices are attenuated to the safe range through the overlapped blades, the device utilization efficiency is improved, the medical cost is reduced, and the patient burden is relieved.

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 performing radiation therapy 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 (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 d...

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 the damage, only small doses of multiple irradiation 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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