A 3D reconstruction method of the body envelope from biplanar X-rays: Evaluation of its accuracy and reliability. Issue 16 (16th December 2015)

• Record Type: Journal Article
• Authors: Nérot, Agathe; Choisne, Julie; Amabile, Célia; Travert, Christophe; Pillet, Hélène; Wang, Xuguang; Skalli, Wafa
• Is Part Of: Journal of biomechanics. Volume 48:Issue 16(2015)
• Page Start: 4322
• Page End: 4326
• Publication Date: 2015-12-16
• Subjects: Body envelope -- Geometric modeling -- Biplanar X-rays -- Reproductibility -- Joint center; Animal mechanics -- Periodicals; Biomechanics -- Periodicals; Biomechanics -- Periodicals; Mécanique animale -- Périodiques; Biomécanique -- Périodiques; Electronic journals; 571.4305
• DOI: 10.1016/j.jbiomech.2015.10.044
• Languages: English
• ISSNs: 0021-9290

Abstract

Abstract: The aim of this study was to propose a novel method for reconstructing the external body envelope from the low dose biplanar X-rays of a person. The 3D body envelope was obtained by deforming a template to match the surface profiles in two X-rays images in three successive steps: global morphing to adopt the position of a person and scale the template׳s body segments, followed by a gross deformation and a fine deformation using two sets of pre-defined control points. To evaluate the method, a biplanar X-ray acquisition was obtained from head to foot for 12 volunteers in a standing posture. Up to 172 radio-opaque skin markers were attached to the body surface and used as reference positions. Each envelope was reconstructed three times by three operators. Results showed a bias lower than 7 mm and a confidence interval (95%) of reproducibility lower than 6 mm for all body parts, comparable to other existing methods matching a template onto stereographic photographs. The proposed method offers the possibility of reconstructing body shape in addition to the skeleton using a low dose biplanar X-rays system.