29 March 2016 “Conventional” CT images from spectral measurements
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Abstract
Spectral imaging systems need to be able to produce "conventional" images, and it's been shown that systems with energy discriminating detectors can achieve higher CNR than conventional systems by optimal weighting. Combining measured data in energy bins (EBs) and also combining basis material images have previously been proposed, but there are no studies systematically comparing the two methods. In this paper, we analytically evaluate the two methods for systems with ideal photon counting detectors using CNR and beam hardening (BH) artifact as metrics. For a 120-kVp polychromatic simulations of a water phantom with low contrast inserts, the difference of the optimal CNR between the two methods for the studied phantom is within 2%. For a polychromatic spectrum, beam-hardening artifacts are noticeable in EB weighted images (BH artifact of 3.8% for 8 EB and 6.9% for 2 EB), while weighted basis material images are free of such artifacts.
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Paurakh L. Rajbhandary, Paurakh L. Rajbhandary, Norbert J. Pelc, Norbert J. Pelc, } "“Conventional” CT images from spectral measurements", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97831Q (29 March 2016); doi: 10.1117/12.2216988; https://doi.org/10.1117/12.2216988
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