Radiotherapy X-ray source and X-ray source device

Abstract

The invention discloses a radiotherapy X-ray source and an X-ray source device, and relates to the technical field of radiotherapy. The radiotherapy X-ray source comprises a substrate; a cold cathodeelectron emission source disposed on the substrate; an anode transmission target disposed opposite to the cold cathode electron emission source, wherein an electric field can be applied between the anode transmission target and the substrate; and a filter disposed on a side of the anode transmission target away from the cold cathode electron emission source. The substrate, the cold cathode electron emission source, the anode transmission target, and the filter are encapsulated in a vacuum chamber. The X-ray source device uses the radiotherapy X-ray source, and further includes a focusing lensand a beam limiter. Compared with the prior art, the radiotherapy X-ray source provided by the invention has electron escape through the cold cathode field emission, does not need to preheat a cathodematerial, and has low power consumption. The cathode material uses an array arrangement and has high electron emission efficiency. The X-ray source device uses the transmission target and has a smallsize and high X-ray generation efficiency.

Description

technical field [0001] The invention relates to the technical field of radiotherapy, in particular to a radiotherapy X-ray source and an X-ray source device. Background technique [0002] Radiation therapy is a local treatment method that uses radiation to treat tumors, including killing tumor cells or diseased tissues by radiation in different forms such as X-rays, γ-rays, and particle beams. Among them, X-ray is used as the radiation source for treatment. According to the voltage of the X-ray machine tube, it is divided into contact therapy (10-60kV), shallow therapy (80-120kV), and deep therapy (150-400kV). X-ray contact therapy is suitable for Skin cancer, scar repair and other superficial diseased tissues. Existing X-ray radiotherapy devices use a hot cathode as the emission source. By heating the cathode filament to 1000°C, the cathode electrons escape, and the escaped electron beam bombards the anode target under the action of the anode high voltage to produce radiat...

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Problems solved by technology

[0003] (1) The hot cathode is used as the electron emission source, the working temperature of the hot cathode is high, and the power consumption is large;

[0004] (2) The ray source device has a large volume and is difficult to miniaturize;

[0005] (3) The divergence angle of the emitted X-rays is too large, and the beam is limited only by the collimator, resulting in a large irradiation area and increasing the risk of normal tissue radiation;

[0006] (4) The anode target adopts a reflective target, and the efficiency of generating X-rays is low

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