18 September 2008 Adaptive acquisition geometry for micro-CT with large format detectors
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Abstract
Reconstruction theory requires that an object should be fully inside the field of view (FOV) of the scanning geometry. This implies that the number of pixels in the detector determines the smallest resolvable details for a given FOV size. Many commercially available micro-CT scanners use a 1-megapixel cameras with 1K pixels in horizontal direction, which can resolve features of 1/1000 of the FOV size. Using a large format detector and a few offset positions will increase imaging resolution, but will also dramatically reduces number of X-ray photons collected per pixel. To improve acquisition efficiency without compromising scanning time, we developed and implemented in commercially produced SkyScan-1172 scanners an adaptive geometry approach. To achieve a chosen magnification, the distances between x-ray source, detector and object are adjusted automatically to most compact geometry with maximum use of X-ray. This adaptive geometry improves significantly the acquisition speed for a large range of magnifications and allows using 10+ megapixels detectors instead of detectors with 1-2 megapixels. Flexible acquisition geometry also opens possibility to use phase-contrast enhancement for improvement in spatial resolution.
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Alexander Sasov, Alexander Sasov, Faisal Nadeem, Faisal Nadeem, Xuan Liu, Xuan Liu, Koen Verelst, Koen Verelst, "Adaptive acquisition geometry for micro-CT with large format detectors", Proc. SPIE 7078, Developments in X-Ray Tomography VI, 70781Q (18 September 2008); doi: 10.1117/12.793203; https://doi.org/10.1117/12.793203
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