Fast three-dimensional reconstruction of lower ... - Antoine Serrurier
Fast three-dimensional reconstruction of lower limbs from biplanar x-rays. S. QUIJANO *â , A.SERRURIER, B.AUBERT, R.ALLENA and W.SKALLI. â Arts et ...
Fast three-dimensional reconstruction of lower limbs from biplanar x-rays. S. QUIJANO *†, A.SERRURIER, B.AUBERT, R.ALLENA and W.SKALLI † Arts et Métiers ParisTech, Laboratoire de Biomécanique (LBM), 151 boulevard de l’hôpital, 75013 PARIS.
Introduction: Three-Dimensional reconstruction of lower limbs is essential for surgical planning and clinical outcome evaluation. 3D reconstruction from Biplanar X-Rays (BXR) is an alternative in regard to irradiation issues of CT-Scan. [Chaibi et al. CMBBE 2011] proposed a two-steps reconstruction method based on a fast Initial Solution (IS) followed by manual adjustments. Further automatic adjustments using image processing require higher accuracy of the IS. This study aims the improvement of the IS based on a new parametric model and an alternative regression approach. Methods: An a priori statistical model was built based on geometric primitives and their descriptive parameters calculated from CT-based reconstructions of 56 femurs and 24 tibias. Statistical inferences used an optimized partial least squares approach allowing to estimate the full set of parameters from a reduced set of predictors obtained via BXR digitalization. From the full set of predictors a 3D generic mesh is deformed globally/locally obtaining the IS. Solution was evaluated in terms of shape accuracy on 9 lower limbs. Reproducibility of Clinical Measurements was assessed on 22 lower limbs; three operators did the reconstructions twice. Comparison to previous IS was performed. Results: Femur and tibia mean shape accuracy was reduced to 1.3 mm, instead of 1.6 mm and 2 mm respectively. Reproducibility of the Neck-Shaft-Angle was reduced to 3.1° instead of 8.3°, tibial torsion, 4.2° instead of 5°, femoral torsion, 5° instead of 6°. Mean reconstruction time is 4 minutes for a skilled operator. Conclusion: IS was improved leading to further automation of the reconstruction.
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