A 3D reconstruction method of the body envelope from biplanar X-rays: Evaluation of its accuracy and reliability

作者：Nerot Agathe; Choisne Julie; Amabile Celia; Travert Christophe; Pillet Helene; Wang Xuguang; Skalli Wafa

来源：Journal of Biomechanics, 2015, 48(16): 4322-4326.

DOI：10.1016/j.jbiomech.2015.10.044

• Body envelope
• Geometric modeling
• Biplanar X-rays
• Reproductibility
• Joint center

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.

• 出版日期2015-12-16