基于碳纳米管场致发射阴极的可变焦X射线管  

X-ray tube with variable focal spots based on field emission of carbon nanotubes cathode

作　　者：唐华平 陈志强[2,3] 刘昂 秦占峰 何武 张庆辉 TANG Huaping;CHEN Zhiqiang;LIU Ang;QIN Zhanfeng;HEWu;ZHANG Qinghui(NuRay Technology Company Limited,Changzhou 213000,China;Department of Engineering Physics,Tsinghua University,Beijing 100084,China;Key Laboratory of Particle&Radiation Imaging(Tsinghua University),Ministry of Education,Beijing 100084,China)

机构地区：[1]新鸿电子有限公司,常州213000 [2]清华大学工程物理系,北京100084 [3]粒子技术与辐射成像教育部重点实验室,北京100084

出　　处：《核技术》2020年第3期13-18,共6页Nuclear Techniques

基　　金：国家杰出青年科学基金项目(No.11525521)资助~~

摘　　要：移动数字化X射线摄影(Digital Radiography,DR)是目前医疗成像领域的热点研究方向,为更好地适用于移动DR设备研制了一种新型X射线管。为了解决热阴极射线管启动慢和无效辐射剂量大等问题,使用碳纳米管阴极代替传统热阴极,并通过主动聚焦机制实现焦斑大小的灵活调整,以便满足不同的临床应用需求。通过设计阶段的数值模拟和设计样品的实际测试,研制的X射线管实现了最大阳极电压110 kV,最大阳极电流70mA,焦斑大小调整范围0.9~1.9(IEC标准焦斑值)的指标,同时给出了4种不同临床应用场景下对应射线管的不同的工作参数。该射线管具有启动快、功耗低、无效辐射剂量小、应用场景广泛等特点,非常适合应用于移动DR设备中。[Background] Mobile digital radiography(DR) is a hot research direction in the field of modern medical imaging. [Purpose] This study aims to develop a new-type X-ray tube for mobile DR devices. [Methods] Firstly, in order to solve the problems of slow start-up and high dose of ineffective radiation of hot cathode ray tube, carbon nanotube(CNT) was employed to replace traditional filament as the cathode of the X-ray tube. Then flexible adjustment of focal spot size was realized through active focusing mechanism, so as to meet various clinical application needs. Finally, experimental tests were carried out to compare with the simulation results. [Results] Both the simulation and experimental results show that the maximum anode voltage of the finally built X-ray tube is110 kV, the maximum anode current is 70 m A, and the focal spot size varies between 0.9 and 1.9(IEC 60336 nominal focal spot value). The different working parameters of the corresponding X-ray tube in four different clinical application scenarios are given. [Conclusion] The X-ray tube has many advantages, such as fast startup, low power consumption, and wide application scenarios, which makes it very suitable for mobile DR devices.

关 键 词：碳纳米管阴极 冷阴极射线管 可变焦结构 移动数字化X射线摄影 

分 类 号：TL99[核科学技术—核技术及应用]