Compact and portable X-ray imager system using Medipix3RX
Compact and portable X-ray imager system using Medipix3RX
复制标题
使用 Medipix3RX 的紧凑型便携式 X 射线成像仪系统
DOI：
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
R. V. Silfhout
中科院分区：
文献类型：
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作者：
T. B. Garcia;A. Kachatkou;C. Jiang;D. Omar;J. Marchal;H. Changani;N. Tartoni;R. V. Silfhout
本文介绍了一种新型便携式X射线成像仪系统的设计与实现。该设计采用混合探测器（Medipix 3RX）的直接X射线探测方案。利用Medipix 3RX的高分辨率、零死区时间、单光子检测和电荷共享模式等功能，成像仪与传统的间接检测方案相比具有更好的分辨率和更高的灵敏度。该系统的详细描述，它包括一个真空室包含的传感器，一个电子板的温度管理，调节和读出的传感器和数据处理单元，它也处理网络连接，并允许作为服务器与客户端进行通信。现场可编程门阵列（FPGA）器件用于实现Medipix 3RX的读出协议，除了读出外，FPGA还可以高速执行复杂的图像处理功能，如特征提取、直方图、轮廓分析和图像压缩。利用Peltier制冷器，通过PID算法对传感器的温度进行监测和控制，提高了传感器的能量分辨率和响应稳定性。在不实施数据压缩技术的情况下，该系统能够以连续模式传输680个轮廓/s或240个图像/s。本文介绍了均衡过程的实现和彩色模式的测试。对于实验测量，Medipix 3RX传感器与硅层一起使用。该系统的测试应用之一是作为同步加速器应用的X射线束位置监视器（XBPM）设备。XBPM允许对光束位置、大小和强度进行非破坏性的真实的时间测量。Kapton箔被放置在光束路径中，朝向针孔相机设置散射辐射，该针孔相机设置允许传感器获得光束的图像。通过使用同步加速器X射线束的轮廓，可以研究束位置的高频移动，高达340 Hz。该系统能够通过使用Medipix 3RX可变能量阈值功能实现射束的独立能量测量。
In this paper the design and implementation of a novel portable X-ray imager system is presented. The design features a direct X-ray detection scheme by making use of a hybrid detector (Medipix3RX). Taking advantages of the capabilities of the Medipix3RX, like a high resolution, zero dead-time, single photon detection and charge-sharing mode, the imager has a better resolution and higher sensitivity compared to using traditional indirect detection schemes. A detailed description of the system is presented, which consists of a vacuum chamber containing the sensor, an electronic board for temperature management, conditioning and readout of the sensor and a data processing unit which also handles network connection and allow communication with clients by acting as a server. A field programmable gate array (FPGA) device is used to implement the readout protocol for the Medipix3RX, apart from the readout the FPGA can perform complex image processing functions such as feature extraction, histogram, profiling and image compression at high speeds. The temperature of the sensor is monitored and controlled through a PID algorithm making use of a Peltier cooler, improving the energy resolution and response stability of the sensor. Without implementing data compression techniques, the system is capable of transferring 680 profiles/s or 240 images/s in a continuous mode. Implementation of equalization procedures and tests on colour mode are presented in this paper. For the experimental measurements the Medipix3RX sensor was used with a Silicon layer. One of the tested applications of the system is as an X-ray beam position monitor (XBPM) device for synchrotron applications. The XBPM allows a non-destructive real time measurement of the beam position, size and intensity. A Kapton foil is placed in the beam path scattering radiation towards a pinhole camera setup that allows the sensor to obtain an image of the beam. By using profiles of the synchrotron X-ray beam, high frequency movement of the beam position can be studied, up to 340 Hz. The system is capable of realizing an independent energy measure of the beam by using the Medipix3RX variable energy threshold feature.
高分辨率透明 X 射线束定位和成像。
影响因子：
3.6
作者：
Van Silfhout R
通讯作者：
Van Silfhout R