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An interpolation technique to enable accurate three-dimensional joint kinematic analyses using asynchronous biplane

Mohsen Akbari-Shandiz1, Joseph D Mozingo2, David R Holmes Iii3

  • 1Rehabilitation Medicine Research Center, Department of Physical Medicine & Rehabilitation, Mayo Clinic, Rochester, MN, USA.

Medical Engineering & Physics
|August 13, 2018
PubMed
Summary

This study introduces an interpolation technique to improve 3D joint kinematics measurement using biplane fluoroscopy. The method reduces registration errors from asynchronous x-ray images, enhancing accuracy for clinical applications.

Keywords:
2D-3D model-based registrationAsynchronous image acquisitionBead trackingClinical biplane fluoroscopic systemsInterpolationKinematics

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Area of Science:

  • Biomechanics
  • Medical Imaging
  • Orthopedics

Background:

  • Biplane 2D-3D model-based registration and radiostereometric analysis (RSA) are standard for in vivo joint kinematics.
  • Clinical biplane systems suffer from registration errors due to asynchronous x-ray image acquisition.

Purpose of the Study:

  • To introduce and evaluate an interpolation technique for generating synchronous fluoroscopy image estimates.
  • To reduce image registration errors in biplane systems.

Main Methods:

  • Developed an interpolation technique to create synchronous fluoroscopy image estimates.
  • Evaluated the technique using a phantom study and a cadaveric shoulder study.
  • Compared interpolated biplane registration with asynchronous registration.

Main Results:

  • Phantom study showed interpolated bead tracking agreed better with true positions than asynchronous images alone.
  • Reduced RMS error in glenohumeral kinematics: 1.27mm (AP), 0.40mm (SI), 0.47mm (ML) translation.
  • Reduced rotational error: 0.47° (ab-adduction), 0.67° (IR), 0.19° (FE).

Conclusions:

  • The interpolation technique effectively reduces image registration error in biplane systems.
  • This method improves the accuracy of 3D joint kinematics measurements.
  • The approach is valuable for high-velocity activities using clinical biplane fluoroscopes or dual c-arms.