title: Comparative investigation of bone mineral density using CT and DEXA in a canine femoral model.
abstract: Bone density measurements using computed tomography (CT) instead of dual-energy X-ray absorptiometry (DEXA) are currently of great interest in human and veterinary medical research as it would be beneficial to use CT scans obtained for other indications also for determining bone density. For Hounsfield units (HU) measured with CT in specific regions of interests (ROIs) in one or several slice/s a correlation with bone mineral density (BMD) measured by DEXA in humans and dogs of between 0.44 and 0.77 is reported in the literature. In the present study, instead certain volumes of interest (VOIs) obtained by CT scan and the corresponding HU to the respective VOIs were compared with the bone mineral density of the corresponding areas measured by DEXA. The aim of the study was to investigate whether this procedure gives more accurate information about bone density of the bones as three-dimensional objects of the respective patient. Correlation between measured HU in the respective VOI and BMD measured with DEXA in the corresponding ROI showed a very good correlation of 0.93. Linear regression with R2= 0.85 (p = 0.0262) was calculated. Except for VOI5, similar distribution of values and significant differences (p < 0.0001-0.0087) between ROIs/VOIs were detected. Determining HU for assessing bone mineral density in a certain volume provides more accurate results than those previously reported from two-dimensional (2D) CT measurements. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 35:2667-2672, 2017.
authors.affiliation: Small Animal Clinic, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, Hannover, 30559, Germany.
authors.forename: Karin
authors.initials: K
authors.lastname: Lucas
authors.affiliation: Institute of Forming Technology and Machines, Leibniz University Hannover, Hannover, Germany.
authors.forename: Bernd-Arno
authors.initials: BA
authors.lastname: Behrens
authors.affiliation: Small Animal Clinic, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, Hannover, 30559, Germany.
authors.forename: Ingo
authors.initials: I
authors.lastname: Nolte
authors.affiliation: Small Animal Clinic, Faculty of Veterinary Medicine, National University of Colombia, Bogotá, Colombia.
authors.forename: Vladimir
authors.initials: V
authors.lastname: Galindo-Zamora
authors.affiliation: Institute of Forming Technology and Machines, Leibniz University Hannover, Hannover, Germany.
authors.forename: Stefanie
authors.initials: S
authors.lastname: Betancur
authors.affiliation: Institute of Forming Technology and Machines, Leibniz University Hannover, Hannover, Germany.
authors.forename: Amer
authors.initials: A
authors.lastname: Almohallami
authors.affiliation: Institute of Forming Technology and Machines, Leibniz University Hannover, Hannover, Germany.
authors.forename: Anas
authors.initials: A
authors.lastname: Bouguecha
authors.affiliation: Faculty of Veterinary Medicine, Department of Surgery, Cairo University, Giza, 12211, Egypt.
authors.forename: Ayman
authors.initials: A
authors.lastname: Mostafa
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Matthias
authors.initials: M
authors.lastname: Lerch
authors.affiliation: Department of Orthopaedic Surgery, Hannover Medical School, Hannover, Germany.
authors.forename: Christina
authors.initials: C
authors.lastname: Stukenborg-Colsman
authors.affiliation: Small Animal Clinic, University of Veterinary Medicine Hannover, Foundation, Bünteweg 9, Hannover, 30559, Germany.
authors.forename: Patrick
authors.initials: P
authors.lastname: Wefstaedt
mesh_terms: D015502:Absorptiometry, Photon; D000818:Animals; D015519:Bone Density; D004285:Dogs; D005269:Femur / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed
keywords: DEXA; bone mineral density; canine femur; computed tomography; volume of interest