Performance of low-cost X-ray area detectors with consumer digital cameras
Performance of low-cost X-ray area detectors with consumer digital cameras
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DOI：
10.1088/1748-0221/10/05/t05005
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发表时间：
2015-05-01
影响因子：
1.3
通讯作者：
Wen, H.
中科院分区：
文献类型：
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作者：
Panna, A.;Gomella, A. A.;Wen, H.
我们使用消费级数码相机与商业X射线荧光粉相结合来构建X射线探测器。针对Varian PaxScan 3024M（Varian 3024M）数字平板检测器测试了几种检测器配置。这些包括以背光、正入射几何形状和以前光、斜入射几何形状耦合到绿色发射磷光体的消费者相机（Nikon D800、Nikon D700和Nikon D3X）。我们用光子转移法来评估探测器的灵敏度和暗噪声，用边缘测试法来评估它们的空间分辨率。我们的评估提供的基本规格包括每单位曝光表面剂量每mm（2）捕获的离散电荷事件，每个像素电荷事件当量的暗噪声，以及探测器线扩展函数（LSF）半高全宽（FWHM）的空间分辨率。使用钨阳极X射线管在50 kVp下进行测量。结果表明，国产探测器比商用平板探测器具有更好的灵敏度和更低的噪声，部分探测器具有更好的空间分辨率。其代价是成像面积大大减小。由于其成本低得多，这些自制的探测器是低剂量成像应用原型开发的有吸引力的选择。
We constructed X-ray detectors using consumer-grade digital cameras coupled to commercial X-ray phosphors. Several detector configurations were tested against the Varian PaxScan 3024M (Varian 3024M) digital flat panel detector. These include consumer cameras (Nikon D800, Nikon D700, and Nikon D3X) coupled to a green emission phosphor in a back-lit, normal incidence geometry, and in a front-lit, oblique incidence geometry. We used the photon transfer method to evaluate detector sensitivity and dark noise, and the edge test method to evaluate their spatial resolution. The essential specifications provided by our evaluation include discrete charge events captured per mm(2) per unit exposure surface dose, dark noise in equivalents of charge events per pixel, and spatial resolution in terms of the full width at half maximum (FWHM) of the detector`s line spread function (LSF). Measurements were performed using a tungsten anode X-ray tube at 50 kVp. The results show that the home-built detectors provide better sensitivity and lower noise than the commercial flat panel detector, and some have better spatial resolution. The trade-off is substantially smaller imaging areas. Given their much lower costs, these home-built detectors are attractive options for prototype development of low-dose imaging applications.