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, Denise A. Reyes, Carolyn A. MacDonald, 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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