Published 21 July, 2017
Thomas M DeCarlo
Department of Earth Sciences, Oceans Institute, and ARC Centre of Excellence for Coral Reef Studies, The University of WesternAustralia
Computed tomography (CT) scanning of coral skeletons provides critical information about coral growth and sensitivity to environmental change. Accurately deriving skeletal density from CT depends on careful calibration and may be sensitive to instrument settings, scanresolution, orspecies eﬀects. Here, Ievaluate the inﬂuence softhese factors on deriving bulk coral skeletal densities from CT scans. The results show that instrument settings have important eﬀects on derived densities. Increasing the beam hardening correction and decreasing scanning voltage had large eﬀects, increasing derived density by 44% and 39%, respectively. Conversely, the eﬀects of changing sample thickness and scan resolution by factors of two were smaller (<10% diﬀerence in derived density), though still important. There were no apparent diﬀerences between two genera (Porites sp. and Pocillopora sp.), but this should be validated with further investigations.
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