Morphometric evaluations of personalised 3D reconstructions and geometric models of the human spine |
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Authors: | Professor C -É Aubin J Dansereau F Parent H Labelle J A de Guise |
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Institution: | 1. Department of Mechanical Engineering, école Polytechnique, Station ‘Centre-Ville’, PO Box 6079, H3C 3A7, Montréal, Québec, Canada 2. Research Center, Sainte-Justine Hospital, 3175 C?te Sainte-Catherine Road, H3T 1C5, Montréal, Québec, Canada 3. Department of Automated Production Engineering, école de Technologie Supérieure, 1110 Notre-Dame O., H3C 1K3, Montréal, Québec, Canada
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Abstract: | In the past, several techniques have been developed to study and analyse the 3D characteristics of the human spine: multi-view
radiographic or biplanar 3D reconstructions, CT-scan 3D reconstructions and geometric models. Extensive evaluations of three
of these techniques that are routinely used at Sainte-Justine Hospital (Montréal, Canada) are presented. The accuracy of these
methods is assessed by comparing them with precise measurements made with a coordinate measuring machine on 17 thoracic and
lumbar vertebrae (T1-L5) extracted from a normal cadaveric spine specimen. Multi-view radiographic 3D reconstructions are
evaluated for different combinations of X-ray views: lateral (LAT), postero-anterior with normal incidence (PAOo) and postero-anterior with 20o angled down incidence (PA20o). The following accuracies are found for these reconstructions obtained from different radiographic setups: 2.1±1.5 mm for
the combination with PAOo-LAT views, and 5.6±4.5 mm for the PAOo-PA20o stereopair. Higher errors are found in the postero-anterior direction, especially for the PAOo-PA20o view combination. Pedicles are found to be the most precise landmarks. Accuracy for CT-scan 3D reconstructions is about 1.1±0.8
mm. As for a geometric model built using a multiview radiographic reconstruction based on six landmarks per vertebra, accuracies
of about 2.6±2.4 mm for landmarks and 2.3±2.0 mm for morphometric parameters are found. The geometric model and 3D reconstruction
techniques give accurate information, at low X-ray dose. The accuracy assessment of the techniques used to study the 3D characteristics
of the human spine is important, because it allows better and more efficient quantitative evaluations of spinal dysfunctions
and their treatments, as well as biomechanical modelling of the spine. |
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Keywords: | 3D reconstructions Multi-planar X-rays CT-scan Geometric model Spine Co-ordinate measuring machine Digital X-rays Vertebral morphometry |
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