Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Sayo-cho, Hyogo 679-5198, Japan.
J Synchrotron Radiat. 2011 Mar;18(Pt 2):217-23. doi: 10.1107/S0909049510044523. Epub 2010 Dec 2.
X-ray imaging detectors with an identical phosphor and a CCD chip but employing lens- and fiber-coupling between them have been compared. These are designed for X-ray imaging experiments, especially computed tomography, at the medium-length beamline at the SPring-8 synchrotron radiation facility. It was found that the transmittance of light to the CCD is about four times higher in the fiber-coupled detector. The uniformity of response in the lens-coupled detector has a global shading of up to 40%, while pixel-to-pixel variation owing to a chicken-wire pattern was dominant in the fiber-coupled detector. Apart from the higher transmittance, the fiber-coupled detector has a few characteristics that require attention when it is used for computed tomography, which are browning of the fiber, discontinuity in the image, image distortion, and dark spots in the chicken-wire pattern. Thus, it is most suitable for high-speed tomography of samples that tend to deform, for example biological and soft materials.
已对采用相同荧光粉和 CCD 芯片但采用透镜和光纤耦合的 X 射线成像探测器进行了比较。这些探测器专为 SPring-8 同步辐射设施中中程光束线的 X 射线成像实验，特别是计算机断层摄影术而设计。结果发现，光纤耦合探测器中光到达 CCD 的透过率约高 4 倍。透镜耦合探测器的响应均匀性具有高达 40%的全局阴影，而由于鸡笼图案引起的像素到像素的变化在光纤耦合探测器中占主导地位。除了更高的透过率外，光纤耦合探测器在用于计算机断层摄影术时还有一些需要注意的特性，例如光纤的褐变、图像的不连续性、图像变形和鸡笼图案中的暗点。因此，它最适合于容易变形的样品的高速断层摄影术，例如生物和软材料。
