A Fully Automatic 3D Reconstruction of Scoliotic Spine from Biplanar Radiographs in a Suspension Framework.

The spine flexibility is an essential information for surgical planning of scoliotic patients. It can be computed using a suspension framework where the patient is raised through a harness and the spine stretched using his weight. To this end, two spine’s 3D reconstructions are obtained using biplanar radiographs in standing and suspension positions in order to compute the flexibility by comparing both positions clinical parameters. This process automation requires to automate the 3D reconstruction process. In contrast to previous works, that usually deal with the 3D reconstruction in standing position, this paper focus on the 3D reconstruction in suspension position by including, as a prior information, the 3D reconstruction in standing position. The proposed method was validated on 57 patients with adolescent idiopathic scoliosis and showed improvement on vertebrae positions with respect to literature work. The mean (std) 3D error’s norm decreased from 8.31 (9.02) mm to 3.89 (3.88) mm.