Quantification of Spinal Deformities using 3D Reconstruction from Biplanar Radiographs

Sampath, K and Nayak, Prabhakar K and Hareesha , K S (2014) Quantification of Spinal Deformities using 3D Reconstruction from Biplanar Radiographs. In: Manipal Research Colloquium , April 11–12, 2014, Manipal.

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The spine is a very complex anatomical structure, the pathological deformations of which have traditionally been evaluated in 2D using posteroanterior (PA) and/or lateral (LAT) view X-rays. The importances of 3D concepts in clinical studies, as well as personalized biomechanical finite element models and specific morphometric studies of the human spine have created a need for a precise geometric reconstruction method. 3D reconstruction of the spine from PA and LAT radiographs is extremely challenging. An approach based on epipolar geometry is proposed for 3D spine reconstruction. A calibration apparatus is designed for this purpose. The proposed method first detects the stereo corresponding points (SCPs) in biplanar radiographs and estimates the 3D positions of these landmarks based on epipolar geometry. Then 3D reconstruction of the landmark positions is done with the non-stereo corresponding points (NSCPs) under the constraints of both epipolar geometry and spinal topology. With the 3D landmarks (including SCPs and NSCPs) reconstructed as control points, the anatomical primitives are deformed to obtain the personalized vertebral models by using the Kriging algorithm. The point-to-surface distances between the biplanar radiographic and CT-scan reconstructions are calculated for two vertebrae (T4 and L2) to validate the proposed method. The measurement of axial vertebral rotation and the spinal curvature of the reconstructed spine will quantify the spinal deformities.

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: 3D spine modelling, Biplanar radiography, Scoliosis
Subjects: Engineering > MIT Manipal > Electronics and Communication
Engineering > MIT Manipal > MCA
Depositing User: MIT Library
Date Deposited: 15 May 2015 06:03
Last Modified: 19 May 2015 07:55
URI: http://eprints.manipal.edu/id/eprint/142644

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