Journal
MEDICAL ENGINEERING & PHYSICS
Volume 31, Issue 6, Pages 681-687Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2009.01.003
Keywords
Biplanar X-rays; Spine; Scoliosis; 3D reconstruction; Longitudinal and transversal inferences
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Funding
- CNRS (Centre National de la Recherche Scientifique, France)
- ETS Ecole de Technologie Superieure, Montreal, Canada)
- Biospace med company (Paris, France)
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Reconstruction methods from biplanar X-rays provide 3D analysis of spinal deformities for patients in standing position with a low radiation dose. However, such methods require an important reconstruction time and there is a clinical need for fast and accurate techniques. This study proposes and evaluates a novel reconstruction method of the spine from biplanar X-rays. The approach uses parametric models based on longitudinal and transversal inferences. A first reconstruction level, dedicated to routine clinical use, allows to get a fast estimate (reconstruction time: 2 min 30 s) of the 3D reconstruction and accurate clinical measurements. The clinical measurements precision (evaluated on asymptomatic subjects, moderate and severe scolioses) was between 1.21 and 5.6 degrees. For a more accurate 3D reconstruction (complex pathologies or research purposes), a second reconstruction level can be obtained within a reduced reconstruction time (10 min) with a fine adjustment of the 3D models. The mean shape accuracy in comparison with CT-scan was 1.0 mm. The 3D reconstruction method precision was 1.8 mm for the vertebrae position and between 2.3 degrees and 3.9 degrees for the orientation. With a reduced reconstruction time, an improved accuracy and precision and a method proposing two reconstruction levels, this approach is efficient for both clinical routine uses and research purposes. (C) 2009 IPEM. Published by Elsevier Ltd. All rights reserved.
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