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J Synchrotron Radiat. 2011 Mar;18(Pt 2):217-23. doi: 10.1107/S0909049510044523. Epub 2010 Dec 2.

Comparison of lens- and fiber-coupled CCD detectors for X-ray computed tomography.

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Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-gun, Sayo-cho, Hyogo 679-5198, Japan.


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.

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