Accelerator non-coplanar radiation therapy device based on compound dual rotating rack

Abstract

The invention discloses an accelerator non-coplanar radiation therapy device based on a compound dual rotating rack. The device comprises a main frame rotating along the xz plane, a sub-frame rotatably connected with the main frame, the sub-frame rotating along the yz plane, the main frame carrying two sets of CBCT subsystems, two sets of CBCT subsystems arranged orthogonally, and the sub-frame carrying an accelerator radiation head and an EPID flat panel detector. The invention can realize multi-wire beam stereotactic radiotherapy, has simple structure, high isocenter precision, low cost, high operation efficiency and safe treatment.

Description

technical field [0001] The invention relates to a medical device, in particular to an accelerator non-coplanar radiotherapy device based on a compound double rotating frame. Background technique [0002] So far, there have been three major achievements in X(γ) ray radiotherapy technology, which are multi-beam focused irradiation technology based on non-coplanar irradiation, and intensity-modulated radiotherapy ( Intensity Modulated Radiation Therapy (IMRT) and Image Guided Radiotherapy (IGRT) based on KV class X-ray cone beam CT (ConeBeam CT, CBCT). [0003] Practice has proved that non-coplanar multi-beam irradiation can actively avoid dangerous organs adjacent to the target area or on the ray path, reduce the volume of the human body and reduce its total dose, thereby increasing the target dose of the tumor. Because the rotating gantry of traditional accelerators can only rotate coplanarly in one plane, non-coplanar irradiation is realized through the isocentric rotation ...

AI Technical Summary

Problems solved by technology

Since the rotating gantry of a traditional accelerator can only rotate coplanarly in one plane, non-coplanar irradiation is realized through the isocentric rotation of the treatment bed on the horizontal plane; due to the clear space between the end face of the collimator of the radiation head and the isocenter point It can only reach about 400mm. After the treatment bed rotates, it will cause the risk of collision between the radiation head and the treatment bed or the patient. In most cases, the rotation range of the rotating frame is narrow, resulting in many irradiation dead angles. Therefore, traditional accelerators still Difficult to irradiate lesions such as lung cancer, liver cancer, and pituitary tumors, and can cause serious side effects such as radiation pneumonitis

In addition, the additionally installed CBCT further limits the rotatable range of the treatment bed and the technical efficiency of the equipment

Third, bed rotation during treatment increases the risk of target movement

Since it is necessary to form an angle of ±60° between the annular frame and the treatment bed without interference, the aperture of the annular frame carrying the radiation head of the accelerator must be large, resulting in slight deflection of the radiation head at certain angles. In order to compensate This kind of deflection uses a universal head mechanism that can rotate ±2.5° in the direction of the ring of the ring frame and the axis direction perpendicular to the plane of the ring frame to aim at the isocenter point, which leads to a complex structure of the product , resulting in higher manufacturing costs and ultimately higher selling prices, and no tapered bore collimator

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