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A comparison of calibration methods for stereo fluoroscopic imaging systems
Bart L Kaptein1, Kevin B Shelburne, Michael R Torry
1Leiden University Medical Center, Department of Orthopaedics and Division of Image Processing, Department of Radiology, Leiden, The Netherlands.
Journal of Biomechanics
|July 26, 2011
Summary
Accurate calibration of stereo (biplane) fluoroscopic imaging systems is crucial for precise joint kinematics studies. Correcting for image distortion and using recommended methods like a calibration cube and the Direct Linear Transformation (DLT) method yield sub-millimeter accuracy.
Area of Science:
- Medical Imaging
- Biomechanics
- Orthopedics
Background:
- Stereo (biplane) fluoroscopic imaging systems offer high accuracy for in vivo joint kinematics.
- System calibration is essential, involving distortion correction, focus position calculation, and relative system positioning.
Purpose of the Study:
- To compare six biplane fluoroscopy calibration methods, including a novel nested-optimization technique.
- To quantify the bias and precision of different calibration methods for joint kinematics studies.
Main Methods:
- Compared six calibration methods using an electronic digital caliper with tantalum markers in various poses.
- Calculated bias and precision by measuring marker displacement between caliper configurations.
- Evaluated the impact of image distortion correction and different focus position calculation methods.
Main Results:
- Correcting for image distortion is essential for achieving sub-millimeter accuracy.
- A calibration plate and cube improved accuracy 2-3 times compared to other methods.
- The Direct Linear Transformation (DLT) method is recommended for focus position calculation due to speed and accuracy.
Conclusions:
- Recommended calibration methodology involves using a machined plate and calibration cube for improved accuracy.
- The DLT method is efficient for determining focus position and 3D fluoroscopy configuration.
- The proposed calibration approach can achieve bias and precision of 0.09 mm and 0.05 mm, respectively.
