Nérot Agathe, Choisne Julie, Amabile Célia, Travert Christophe, Pillet Hélène, Wang Xuguang, Skalli Wafa
Arts et Métiers ParisTech., LBM/Institut de Biomécanique Humaine Georges Charpak, 151, Boulevard de l׳hôpital, 75013 Paris, France; Université de Lyon, F-69622 Lyon, France; Université Claude Bernard Lyon 1, Villeurbanne, France; IFSTTAR, UMR_T9406, LBMC Laboratoire de Biomécanique et Mécanique des Chocs, F69675, Bron, France.
Arts et Métiers ParisTech., LBM/Institut de Biomécanique Humaine Georges Charpak, 151, Boulevard de l׳hôpital, 75013 Paris, France.
J Biomech. 2015 Dec 16;48(16):4322-6. doi: 10.1016/j.jbiomech.2015.10.044. Epub 2015 Nov 6.
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 7mm and a confidence interval (95%) of reproducibility lower than 6mm 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.
本研究的目的是提出一种从人的低剂量双平面X射线重建身体外部轮廓的新方法。通过在三个连续步骤中使模板变形以匹配两个X射线图像中的表面轮廓来获得3D身体轮廓：全局变形以采用人的位置并缩放模板的身体部分，然后使用两组预定义的控制点进行粗略变形和精细变形。为了评估该方法，对12名站立姿势的志愿者进行了从头到脚的双平面X射线采集。在身体表面附着了多达172个不透射线的皮肤标记物，并用作参考位置。每个轮廓由三名操作人员重建三次。结果显示，所有身体部位的偏差低于7毫米，再现性的置信区间（95%）低于6毫米，与将模板与立体照片匹配的其他现有方法相当。所提出的方法提供了使用低剂量双平面X射线系统除了重建骨骼之外还能重建身体形状的可能性。
