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相比传统热阴极X射线源而言,碳纳米管X射线源具有结构紧凑、高时间分辨率、可编程式发射等优势,因此可以采用电子式的扫描方式取代传统扫描方式,提高采集图像的时间分辨率,减少运动伪影,降低辐射剂量。文章针对该新型X射线源静态扫描系统进行软硬件平台设计。其中,硬件平台集成了多光束X射线源及其驱动电路、高压发生器、复合真空计和数字平板探测器;下位机软件采用Quartus II开发平台,Verilog硬件描述语言,实现多路脉冲及触发信号的产生;上位机软件平台采用Lab VIEW图形化编程工具,实现多台仪器的集成控制,完成多光束X射线源静态扫描、高压控制、真空度监测和图像采集功能。本系统设计通过实验验证,可实现多光束碳纳米管X射线源脉冲式静态扫描成像,为碳纳米管静态CT的研制提供了实验和测试平台。
Compared with the traditional hot cathode X-ray source, the carbon nanotube X-ray source has the advantages of compact structure, high time resolution and programmable emission. Therefore, the electronic scanning method can be used instead of the traditional scanning method to improve the image acquisition Time resolution, reduce motion artifacts and reduce radiation dose. The article designs the hardware and software platform for the new X-ray source static scanning system. Among them, the hardware platform integrates multi-beam X-ray source and its drive circuit, high voltage generator, composite vacuum gauge and digital flat panel detector; lower computer software using Quartus II development platform, Verilog hardware description language to achieve multiple pulse and trigger signal ; PC software platform using LabVIEW graphical programming tools to achieve integrated control of multiple instruments to complete multi-beam X-ray source static scanning, high-pressure control, vacuum monitoring and image acquisition capabilities. The system design through experimental verification, multi-beam carbon nanotube X-ray source can be achieved by static pulse scanning imaging for the development of static carbon nanotubes provided experimental and test platform.