Open AccessComparison of lens‐ and fiber‐coupled CCD detectors for X‐ray computed tomography
Author(s) -
Uesugi K.,
Hoshino M.,
Yagi N.
Publication year - 2011
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049510044523
Subject(s) - optics , detector , lens (geology) , transmittance , physics , materials science , fiber , beamline , pixel , tomography , synchrotron radiation , beam (structure) , composite material
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.