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射线数字成像检测技术

  


射线数字成像检测技术

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(韩焱,华北工学院现代元损检测技术工程中心,太原030051)


    摘要:介绍多种射线数字成像(DR)系统的组成及成像机理,分析其性能指标、优缺点及应用领域。光子放大的DR系统(如图像增强器DR系统)实时性好,但适应的射线能量低,检测灵敏度相对较低;其它系统的检测灵敏度较高但成像时间较长。DR系统成像方式的主要区别在于射线探测器,除射线转换方式外,影响系统检测灵敏度的主要因素是散射噪声和量子噪声;可采用加准直器和光量子积分降噪的方法提高检测灵敏度。
    关键词:射线检验;数字成像系统;综述
    中图分类号:TGll5.28 文献标识码:A 文章编号:1000-6656(2003109-0468-04



DIGITAL RADIOGRAPHIC TECHNOLOGY
HAN Yan(Center of Modern NDT & E, North China Institute of Technology, Taiyuan 030051, China)


Abstract: The structure and imaging principle of digital radiographic (DR) systems are introduced. And the characteristics, performances, advantages, disadvantages and applications of the systems are analyzed. The DR system with photon amplification such as the DR system with intensifier can get real-time imaging, but it fits for lower energy and its inspection sensitivity is lower. The systems working with high energy can obtain higher sensitivity,while is time-consuming. The imaging way of a DR system depends on the detector used, and the factors influencing inspection sensitivity are the quantum noise from ray source and scatter noise besides the transform way of rays.Quantum integration noise reducer and collimator can be used to improve the inspection sensitivity of the system.
Keywords:Radiography; Digital imaging system; Survey

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