Article Dans Une Revue Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization Année : 2014

3D reconstruction of ribcage geometry from biplanar radiographs using a statistical parametric model approach

Benjamin Aubert
  • Fonction : Auteur
Claudio Vergari
Brice Ilharreborde
  • Fonction : Auteur
Aurélien Courvoisier
  • Fonction : Auteur
Wafa Skalli

Résumé

Rib cage 3D reconstruction is an important prerequisite for thoracic spine modelling, particularly for studies of the deformed thorax in adolescent idiopathic scoliosis. This study proposes a new method for rib cage 3D reconstruction from biplanar radiographs, using a statistical parametric model approach. Simplified parametric models were defined at the hierarchical levels of rib cage surface, rib midline and rib surface, and applied on a database of 86 trunks. The resulting parameter database served to statistical models learning which were used to quickly provide a first estimate of the reconstruction from identifications on both radiographs. This solution was then refined by manual adjustments in order to improve the matching between model and image. Accuracy was assessed by comparison with 29 rib cages from CT scans in terms of geometrical parameter differences and in terms of line-to-line error distance between the rib midlines. Intra and inter-observer reproducibility were determined regarding 20 scoliotic patients. The first estimate (mean reconstruction time of 2’30) was sufficient to extract the main rib cage global parameters with a 95% confidence interval lower than 7%, 8%, 2% and 4° for rib cage volume, antero-posterior and lateral maximal diameters and maximal rib hump, respectively. The mean error distance was 5.4 mm (max 35mm) down to 3.6 mm (max 24 mm) after the manual adjustment step (+3’30). The proposed method will improve developments of rib cage finite element modeling and evaluation of clinical outcomes.

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hal-05033475 , version 1 (14-04-2025)

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Benjamin Aubert, Claudio Vergari, Brice Ilharreborde, Aurélien Courvoisier, Wafa Skalli. 3D reconstruction of ribcage geometry from biplanar radiographs using a statistical parametric model approach. Computer Methods in Biomechanics and Biomedical Engineering: Imaging & Visualization, 2014, pp.In Press. ⟨10.1080/21681163.2014.913990⟩. ⟨hal-05033475⟩
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