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Related Experiment Video

Updated: Apr 5, 2026

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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CTREC: C-arm Tracking and Reconstruction using Elliptic Curves.

Gouthami Chintalapani1, Ameet K Jain2, David H Burkhardt3

  • 1Johns Hopkins University.

Conference on Computer Vision and Pattern Recognition Workshops. IEEE Computer Society Conference on Computer Vision and Pattern Recognition. Workshops
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Summary

This study introduces a novel mathematical framework using elliptic curves for precise C-arm fluoroscopy pose estimation in surgery. This method enhances 3D reconstruction accuracy, crucial for intra-operative guidance.

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Area of Science:

  • Medical Imaging
  • Surgical Navigation
  • Computer-Aided Surgery

Background:

  • C-arm fluoroscopy is essential in surgery but struggles with accurate 3D information due to pose estimation challenges.
  • Existing methods for tracking C-arm pose in 3D space are often complex or invasive.

Purpose of the Study:

  • To develop a unified mathematical framework for intra-operative pose estimation, correspondence, and 3D reconstruction using C-arm fluoroscopy.
  • To improve the accuracy and efficiency of C-arm tracking for enhanced surgical guidance.

Main Methods:

  • A novel approach utilizing simple elliptic curves to constrain C-arm pose.
  • Employing a single ellipse and randomly distributed points from two views to recover 6 degrees of freedom of C-arm pose.
  • Minimal workspace interference by using patient anatomy or simple markers.

Main Results:

  • Preliminary phantom experiments demonstrated an average C-arm tracking accuracy of 0.51° with a 0.12° standard deviation.
  • The proposed method successfully recovers C-arm pose with high precision.

Conclusions:

  • The elliptic curve-based framework offers a highly accurate and clinically appealing solution for C-arm pose estimation.
  • This method has minimal interference and integrates patient information, making it suitable for various surgical applications.