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Proceedings Paper

3D reconstruction of the scapula from biplanar radiographs
Author(s): P. Y. Lagacé; T. Cresson; N. Hagemeister; F. Billuart; X. Ohl; J. de Guise; W. Skalli
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Paper Abstract

Access to 3D bone models is critical for applications ranging from pre-operative planning to biomechanics studies. This work presents a method for 3D reconstruction of the scapula from biplanar radiographs, which is based on the combination of a parametric model approach in conjunction with a Moving Least Squares (MLS) deformation technique. A parametric scapula model was created by fitting geometric primitives (with their descriptive parameters) to the CT reconstruction of a dry scapula. These geometric primitives were then used to define a set of handles which allow the user to control the as-rigid-as-possible deformation of the template model in real-time, until optimal correspondence between the actual X-ray images and the retro-projection of the deformed model. When applied to 10 dry scapulae, the presented method allowed obtaining reconstructions which were on average within 1mm of the CT-derived model at scapula regions of interest. Morphological parameters such as the glenoid's dimensions and orientation were determined with errors of 1° and less than 1mm, on average. This is of great interest as the current methods used in clinical practice, which are based on 2D-CT, are subject to uncertainties of the order of 5° for glenoid version. This method is of particular interest as it further reduces our dependence to CT for 3D reconstruction of bones and clinical parameter estimation.

Paper Details

Date Published: 14 February 2012
PDF: 6 pages
Proc. SPIE 8314, Medical Imaging 2012: Image Processing, 83143L (14 February 2012); doi: 10.1117/12.911527
Show Author Affiliations
P. Y. Lagacé, Ecole de Technologie Supérieure (Canada)
T. Cresson, Ecole de Technologie Supérieure (Canada)
N. Hagemeister, Ecole de Technologie Supérieure (Canada)
F. Billuart, Ecole Nationale Supérieure d'Arts et Métiers (France)
X. Ohl, Ecole Nationale Supérieure d'Arts et Métiers (France)
J. de Guise, Ecole de Technologie Supérieure (Canada)
W. Skalli, Ecole Nationale Supérieure d'Arts et Métiers (France)

Published in SPIE Proceedings Vol. 8314:
Medical Imaging 2012: Image Processing
David R. Haynor; Sébastien Ourselin, Editor(s)

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