A 3D reconstruction method of the body envelope from biplanar X-rays: Evaluation of its accuracy and reliability
Article dans une revue avec comité de lecture
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.
Showing items related by title, author, creator and subject.
Communication avec acteAMABILE, Célia; CHOISNE, Julie; NÉROT, Agathe; PILLET, Hélène; SKALLI, Wafa (European Society of Biomechanics, 2015)Rib cage volume and thorax density are useful both for clinical issues (Sverzellati et al. 2013) and for multi-segmental body modeling. In the latter case mean density is generally assumed, using data from Dempster et al ...
Determination of a new uniform thorax density representative of the living population from 3D external body shape modeling. Article dans une revue avec comité de lectureAMABILE, Célia; CHOISNE, Julie; NÉROT, Agathe; PILLET, Hélène; SKALLI, Wafa (Elsevier, 2016)Body segment parameters (BSP) for each body's segment are needed for biomechanical analysis. To provide population-speciﬁc BSP, precise estimation of body's segments volume and density are needed. Widely used uniform ...
Article dans une revue avec comité de lectureAMABILE, Célia; NÉROT, Agathe; CHOISNE, Julie; PILLET, Hélène; LAFAGE, Virginie; SKALLI, Wafa (Taylor & Francis, 2015)Sagittal malalignment is associated with increased disability and can lead to postural troubles. The latter is often the result of an inadequate weight distribution on the spine and trigger compensatory mechanisms. No study ...
Article dans une revue avec comité de lectureNÉROT, Agathe; WANG, Xuguang; PILLET, Hélène; SKALLI, Wafa (Taylor & Francis, 2015)Human external shape model is becoming easily available using scanning technology, stereophotogram- metry, or Microsoft Kinect systems. However locating the internal skeleton from the external shape remains a challenging ...
A New Method To Determine Volumetric Bone Mineral Density From Bi-Planar Dual Energy Radiographs Using A Finite Element Model: An Ex-Vivo Study Article dans une revue avec comité de lectureCHOISNE, Julie; TRAVERT, Christophe; VALIADIS, Jean-Marc; FOLLET, Hélène; SKALLI, Wafa (World Scientific Pub Co Pte Lt, 2017)Finite element models (FEMs) derived from QCT-scans were developed to evaluate vertebral strength but QCT scanners limitations are restrictive for routine osteoporotic diagnosis. A new approach considers using bi-planar ...