A rapid method for converting medical Computed Tomography scanner topogram attenuation scale to Hounsfield Unit scale and to obtain relative density values |
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| Authors: | Mathieu J Duchesne Francis Moore Bernard F Long Jacques Labrie |
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| Institution: | aGeological Survey of Canada — Québec, 490 rue de la Couronne, Québec, Québec, Canada G1K 9A9;bInstitut National de la Recherche Scientifique, Centre Eau, Terre et Environnement, 490 rue de la Couronne, Québec, Québec, Canada G1K 9A9;cInstitut National de la Recherche Scientifique, Centre Énergie, Matériaux et Télécommunications, 1650, boul. Lionel-Boulet, Varennes, Québec, Canada J3X 1S2 |
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| Abstract: | Medical Computed Tomography scanners permit to rapidly obtain qualitative and quantitative information on objects in a non-destructive manner in both longitudinal and transversal directions. CT-scan scales used to express attenuation on the images are different for longitudinal (topograms) and transversal (tomograms) views, restraining the complementary use of the information extracted from both views. Moreover, topograms are of full use in core analysis as they reveal fine-scale information on stratigraphical, sedimentological and physical properties of the material. This paper presents a method to convert CT-scan topogram intensity scale to Hounsfield Unit (HU; scale used on tomograms) and to later extract a relative density from it. The method is based on relationships between topogram and tomogram values, absolute density and effective atomic numbers obtained on a series of minerals. Results show excellent correlations between converted topogram values and HU values obtained on the tomograms, as well as between relative densities derived from the converted topogram values, and the absolute density of the minerals. |
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| Keywords: | Computed Tomography Attenuation Density calibration Minerals |
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