Abstract
In vivo measurement of lumbar spine configuration is useful for constructing quantitative biomechanical models. Positional magnetic resonance imaging (MRI) accommodates a larger range of movement in most joints than conventional MRI and does not require a supine position. However, this is achieved at the expense of image resolution and contrast. As a result, quantitative research using positional MRI has required long reconstruction times and is sensitive to incorrectly identifying the vertebral boundary due to low contrast between bone and surrounding tissue in the images. We present a semi-automated method used to obtain digitized reconstructions of lumbar vertebrae in any posture of interest. This method combines a high-resolution reference scan with a low-resolution postural scan to provide a detailed and accurate representation of the vertebrae in the posture of interest. Compared to a criterion standard, translational reconstruction error ranged from 0.7 to 1.6 mm and rotational reconstruction error ranged from 0.3 to 2.6°. Intraclass correlation coefficients indicated high interrater reliability for measurements within the imaging plane (ICC 0.97–0.99). Computational efficiency indicates that this method may be used to compile data sets large enough to account for population variance, and potentially expand the use of positional MRI as a quantitative biomechanics research tool.
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Acknowledgments
This investigation was supported by funding from the National Institutes of Health (R00AT004983). The authors thank Haolin Xu and Naji Foster for their assistance with segmentation, MRI of America (Centennial, CO) for use of the FONAR Upright MRI scanner, and Cherry Creek Imaging (Denver, CO) for use of the CT scanner.
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There are no conflicts of interest related to the personal or professional associations of any of the authors.
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Associate Editor Michael R. Torry oversaw the review of this article.
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Simons, C.J., Cobb, L. & Davidson, B.S. A Fast, Accurate, and Reliable Reconstruction Method of the Lumbar Spine Vertebrae Using Positional MRI. Ann Biomed Eng 42, 833–842 (2014). https://doi.org/10.1007/s10439-013-0947-7
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DOI: https://doi.org/10.1007/s10439-013-0947-7