22 September 1999 Micro-CT scanner with a focusing polycapillary x-ray optic
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A bench-top x-ray micro-CT scanner was used to evaluate a focusing x-ray optic as a means to augment micro-CT scanner performance. The optic consists of a bundle of hollow glass fibers (25 micrometer diameter) which are arranged and curved so that the optic has an 8 degree input focus and a 4.1 degree output focus cone angle. This optic was placed between our spectroscopy x-ray source (18 keV) and the specimen. The x-ray fluorescent crystal plate was placed as close as possible behind the specimen and the light image generated within it was projected onto a CCD with a lens. The specimen was imaged and rotated about its axis in 1 degree steps until a 360 degree rotation was completed. The resulting, normalized, projection images were submitted to modified Feldkamp cone- beam reconstruction. A 1 cm diameter plastic cylinder, in which glass microspheres (nominally 10, 30, 100 or 300 micrometer diameter) were suspended, was used to compare the spatial resolution of the x-ray optic versus the no-optic scans performed at a range of comparable focal spot-to- specimen distances. The increased flux at the specimen obtained by placing the specimen (and fluorescent crystal) closer to the output focal spot of the optic resulted in increased x-ray flux, thereby reducing scan duration several- fold without increase in penumbral blurring.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Steven Mark Jorgensen, Steven Mark Jorgensen, Denise A. Reyes, Denise A. Reyes, Carolyn A. MacDonald, Carolyn A. MacDonald, Erik Leo Ritman, Erik Leo Ritman, } "Micro-CT scanner with a focusing polycapillary x-ray optic", Proc. SPIE 3772, Developments in X-Ray Tomography II, (22 September 1999); doi: 10.1117/12.363717; https://doi.org/10.1117/12.363717

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