Same-source double-energy medical electron linear accelerator for image guided radiation therapy (IGRT)

Abstract

The invention relates to a medical apparatus for tumor radiation therapy, in particular to a same-source double-energy medical electron linear accelerator for image guided radiation therapy (IGRT). The same-source double-energy medical electron linear accelerator for the IGRT is characterized in that: an accelerating tube is vertically arranged and is connected with a moving target below the accelerating tube; an energy switch is arranged on the accelerating tube; an X-ray heavy metal target and a low atomic number target are arranged on the moving target; and the X-ray heavy metal target and the low atomic number target are connected with a driving mechanism of the moving target. The same-source double-energy medical electron linear accelerator for the IGRT has the advantages that: energy of an electron beam generated by the accelerating tube is reduced by the energy switch; by using the characteristic that the electron beam impacts the low atomic number target to generate more low-energy beams, X rays with clear portal imaging are obtained; and the same-source double-energy medical electron linear accelerator for the IGRT has the characteristics of easy mode conversion, same source, stable beam, clear image, economy, reliability, simpleness and convenience in clinical use and the like.

Description

Technical field [0001] The invention relates to a medical device for tumor radiotherapy, in particular to a homologous dual-energy IGRT medical electron linear accelerator. Background technique [0002] A key requirement of radiotherapy is accurate daily treatment placement. Studies have reported that the random and systematic error of daily treatment placement can be as high as 6mm. There are three clinical methods to solve this problem, namely, film verification, electronic imaging system (EPID), and KV-level image guidance system. These three methods have their own characteristics. Film verification is time-consuming and low in efficiency due to film processing and analysis, so the real-time performance is poor and the patient is likely to move again in the process; EPID directly collects MV-level radiation (usually 6MV). The amount of radiation that penetrates the human body is imaged by computer. This method has the advantages of treating and verifying the same position of...

AI Technical Summary

Problems solved by technology

From the fundamental principles of physics and geometry, only the "coaxial" structure of radiation sources such as Tomotherapy can maximize the consistency of the treatment space coordinates and imaging space coordinates and reduce system errors. 3MeV, can not provide KV-level ray products, and the imaging quality is not good enough

[0004] Recently, Tsinghua University is developing a homologous double-beam accelerating tube, which uses the accelerating tube in the normal working mode to obtain 6MV energy therapeutic X-rays, and uses a detuned state (abnormal operation) to obtain X-rays with low energy , for field verification, but the working state is unstable, resulting in unstable beam characteristics, further research is needed, and it cannot be used in clinical applications.

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