Quantification of spinal deformities using combined SCP and geometric 3D reconstruction

Sampath, K and Nayak, Prabhakar K and Hareesha, K S (2016) Quantification of spinal deformities using combined SCP and geometric 3D reconstruction. Biomedical Signal Processing and Control, 31 (1). pp. 181-188. ISSN 1746-8094

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Abstract

tThree dimensional reconstruction is essential in accurate diagnosis of numerous spinal deformitieswhich are 3D in nature. The stereo-radiographic reconstruction involving bi-planar X-rays is one ofthe most commonly used methods. Algorithms with stereo-corresponding point (SCP) or non-stereo-corresponding point (NSCP) can be used to achieve this 3D reconstruction. But, the NSCP method isslower and needs manual identification of many anatomical landmarks. Hence it suffers from observervariability and has restricted usage in normal clinical setup. Thus, a hybrid method is proposed in whichthe SCP reconstructed model is refined using the geometric features from the X-rays to achieve theaccuracy closest to NSCP method. The SCP model is constructed using the X-rays on a calibration benchfrom the scoliotic subject. From these X-rays the vertebral features are extracted automatically. The SCPmodel structure is refined using the geometric transformations according to the extracted features. The3D model thus formed is called combined SCP and geometric (CSCPG) reconstruction. By consideringthe NSCP model as a reference, both qualitative and quantitative approaches are followed to validatethe proposed model. The CSCPG method has lesser observer variability as it needs only six anatomicallandmarks per vertebra. Further, it is faster and the reconstruction error is within the acceptable lim-its. To quantify the deformities like axial vertebral rotation and spinal curvature novel methods havebeen proposed. The axial vertebral rotation is measured using simple vertebra vector parametric com-putations. It needs identification of only two landmarks per vertebra for angle measurement. The apicalvertebra gives the plane of maximum curvature. The actual spinal curvature has to be computed on thisplane. A semi-automatic method is proposed to compute this curvature using a new projection technique.The deformity quantification methods are validated using manual measurements as well as the resultsfrom standard approaches. Hence, a fast, simple and economic 3D diagnostic method is developed forquantification of the spinal deformities.

Item Type: Article
Uncontrolled Keywords: Stereo-radiography; 3D reconstruction of spine; Generic spine model; Scoliosis
Subjects: Engineering > MIT Manipal > Electronics and Communication
Depositing User: MIT Library
Date Deposited: 22 Aug 2016 15:36
Last Modified: 22 Aug 2016 15:36
URI: http://eprints.manipal.edu/id/eprint/146820

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