Tracy E Kirkbride1, Aamir Y Raja2, Kristin Müller3, Christopher J Bateman4, Fabio Becce5, Nigel G Anderson2. 1. 1 Department of Nursing, Midwifery, and Allied Health, Ara Institute of Canterbury, Christchurch, New Zealand. 2. 2 Department of Radiology, University of Otago, Christchurch, New Zealand. 3. 3 University of Lübeck, Lübeck, Germany. 4. 4 Lincoln Agritech Ltd, Lincoln University, Lincoln, New Zealand. 5. 5 Department of Diagnostic and Interventional Radiology, Lausanne University Hospital, Rue du Bugnon 46, Lausanne 1011, Switzerland.
Abstract
OBJECTIVE: We aimed to determine whether multienergy spectral photon-counting CT could distinguish between clinically relevant calcium crystals at clinical x-ray energy ranges. Energy thresholds of 15, 22, 29, and 36 keV and tube voltages of 50, 80, and 110 kVp were selected. Images were analyzed to assess differences in linear attenuation coefficients between various concentrations of calcium hydroxyapatite (54.3, 211.7, 808.5, and 1169.3 mg/cm3) and calcium oxalate (2000 mg/cm3). CONCLUSION: The two lower concentrations of hydroxyapatite were distinguishable from oxalate at all energy thresholds and tube voltages, whereas discrimination at higher concentrations depended primarily on the energy thresholds used. Multienergy spectral photon-counting CT shows promise for distinguishing these calcium crystals.
OBJECTIVE: We aimed to determine whether multienergy spectral photon-counting CT could distinguish between clinically relevant calcium crystals at clinical x-ray energy ranges. Energy thresholds of 15, 22, 29, and 36 keV and tube voltages of 50, 80, and 110 kVp were selected. Images were analyzed to assess differences in linear attenuation coefficients between various concentrations of calcium hydroxyapatite (54.3, 211.7, 808.5, and 1169.3 mg/cm3) and calcium oxalate (2000 mg/cm3). CONCLUSION: The two lower concentrations of hydroxyapatite were distinguishable from oxalate at all energy thresholds and tube voltages, whereas discrimination at higher concentrations depended primarily on the energy thresholds used. Multienergy spectral photon-counting CT shows promise for distinguishing these calcium crystals.
Authors: Julia A Schwab; Mark T Young; Stig A Walsh; Lawrence M Witmer; Yanina Herrera; Zena L Timmons; Ian B Butler; Stephen L Brusatte Journal: R Soc Open Sci Date: 2022-03-23 Impact factor: 2.963