Improved X-ray cargo imaging using a novel high-throughput fast-detector setup.

使用新颖的高通量快速探测器设置改进了 X 射线货物成像。

• 批准号: ST/R000131/1
• 负责人: David Matthew Cullen
• 金额: $ 45.75万
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2018
• 资助国家: 英国
• 起止时间: 2018 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=ST%2FR000131%2F1
• 关键词: Improved; ray; cargo; imaging; using

X-ray screening is high priority for securing borders from the influx of firearms, narcotics, and contraband. The ability of an x-ray screening system to detect photons attenuated by dense cargo directly affects the radiographic image quality that an operator uses to identify such illicit material. When screening cargo and vehicles, high-energy high-dose pulsed linear accelerators are used to generate the x rays. The detection package integrates the signal over the duration of a single pulse and this forms the basis of each pixel value in the image. However, with no means to reject low-energy photons scattered into the detectors or electronic dark current, the signals include a large degree of noise that distorts the final radiographic images. The technological advances in recent years and the exploitation of spectroscopic techniques present an opportunity to utilise novel detector material and off-the-shelf fast electronic components to identify individual photons. This will vastly improve the performance of screening systems and increase image quality, particularly in areas of high attenuation. To this end, this project seeks to investigate new detector material, design, construct and test a prototype detection system capable of photon counting in such high x-ray flux environments. Detector characterisation and design will be carried out at the University of Manchester. Experimental investigations will require the use of the new Compact Linac facility at Daresbury laboratory, capable of producing low-dose x-ray pulses so that algorithms to control the detection package can be developed and the limitations obtained. The detection package will then be used at Rapiscan Systems facility at Stoke using a field-ready linac to prove its capabilities.

X射线筛查是确保边境免受枪支、毒品和违禁品涌入的首要任务。X射线筛查系统检测被致密货物衰减的光子的能力直接影响操作员用于识别这种非法材料的射线照相图像质量。在检查货物和车辆时，使用高能高剂量脉冲线性加速器来产生x射线。检测包在单个脉冲的持续时间内对信号进行积分，这形成了图像中每个像素值的基础。然而，由于没有办法拒绝散射到检测器中的低能光子或电子暗电流，信号包括使最终射线照相图像失真的很大程度的噪声。近年来的技术进步和光谱技术的开发为利用新型探测器材料和现成的快速电子元件来识别单个光子提供了机会。这将极大地改善筛查系统的性能，提高图像质量，特别是在高衰减区域。为此，该项目旨在研究新的探测器材料，设计，建造和测试一个原型探测系统，能够在这样的高X射线通量环境中进行光子计数。探测器的特性和设计将在曼彻斯特大学进行。实验研究将需要使用达雷斯伯里实验室新的紧凑型直线加速器设施，能够产生低剂量的X射线脉冲，以便可以开发控制检测包的算法并获得限制。探测包将在斯托克的Rapiscan系统公司使用一个现场就绪的直线加速器来证明其能力。