3D reconstructions of the external and internal geometries of the trunk using laser and stereo-radiographic imaging techniques

Currently, assessments of scoliosis are done by means of clinical examinati on and full spinal x-rays. Multiple exposure to ionizing radiation, however , call be hazardous to the child and costly. Here we explain the use of a n oninvasive imaging technique for quantifying the three-dimensional (3D) tru nk surface topography that can be used to estimate parameters of 3D deformi ty of the spine. A laser optical scanning system produces a topographical m apping of the entire torso. In conjunction an accurate 3D reconstruction of the spine and rib cage can be developed from die digitized x-ray images of the scoliotic patient. Data from the surface laser scans and bone geometry from x-rays have been collected for 26 scoliotic patients. The technique p rovides the foundation fbr future work using neural networks to assess rela tions between internal bone geometry and external surface geometry of the t orso.