Automated quantification of lumbar vertebral kinematics from dynamic fluoroscopic sequences

Jon Camp; Kristin Zhao; Etienne Morel M.D.; Dan White; Dixon Magnuson; Ralph Gay M.D.; Kai-Nan An; Richard Robb M.D.

doi:10.1117/12.811405

27 February 2009 Automated quantification of lumbar vertebral kinematics from dynamic fluoroscopic sequences

Jon Camp, Kristin Zhao, Etienne Morel M.D., Dan White, Dixon Magnuson, Ralph Gay M.D., Kai-Nan An, Richard Robb M.D.

Proceedings Volume 7260, Medical Imaging 2009: Computer-Aided Diagnosis; 72603M (2009) https://doi.org/10.1117/12.811405
Event: SPIE Medical Imaging, 2009, Lake Buena Vista (Orlando Area), Florida, United States

Abstract

We hypothesize that the vertebra-to-vertebra patterns of spinal flexion and extension motion of persons with lower back pain will differ from those of persons who are pain-free. Thus, it is our goal to measure the motion of individual lumbar vertebrae noninvasively from dynamic fluoroscopic sequences. Two-dimensional normalized mutual information-based image registration was used to track frame-to-frame motion. Software was developed that required the operator to identify each vertebra on the first frame of the sequence using a four-point "caliper" placed at the posterior and anterior edges of the inferior and superior end plates of the target vertebrae. The program then resolved the individual motions of each vertebra independently throughout the entire sequence. To validate the technique, 6 cadaveric lumbar spine specimens were potted in polymethylmethacrylate and instrumented with optoelectric sensors. The specimens were then placed in a custom dynamic spine simulator and moved through flexion-extension cycles while kinematic data and fluoroscopic sequences were simultaneously acquired. We found strong correlation between the absolute flexionextension range of motion of each vertebra as recorded by the optoelectric system and as determined from the fluoroscopic sequence via registration. We conclude that this method is a viable way of noninvasively assessing twodimensional vertebral motion.

Citation Download Citation

Jon Camp, Kristin Zhao, Etienne Morel M.D., Dan White, Dixon Magnuson, Ralph Gay M.D., Kai-Nan An, and Richard Robb M.D. "Automated quantification of lumbar vertebral kinematics from dynamic fluoroscopic sequences", Proc. SPIE 7260, Medical Imaging 2009: Computer-Aided Diagnosis, 72603M (27 February 2009); https://doi.org/10.1117/12.811405

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KEYWORDS

Image registration

Kinematics

Spine

Fluoroscopy

Motion measurement

Sensors

Data acquisition

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