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Related Concept Videos

Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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Consider a crane whose telescopic boom rotates with an angular velocity of 0.04 rad/s and angular acceleration of 0.02 rad/s2. Along with the rotation, the boom also extends linearly with a uniform speed of 5 m/s. The extension of the boom is measured at point D, which is measured with respect to the fixed point C on the other end of the boom. For the given instant, the distance between points C and D is 60 meters.
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Relative Motion Analysis using Rotating Axes01:25

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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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Related Experiment Video

Updated: Dec 14, 2025

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation
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A visual odometry base-tracking system for intraoperative C-arm guidance.

Luke Haliburton1, Hooman Esfandiari2, Pierre Guy3

  • 1Department of Mechanical Engineering, University of British Columbia, Vancouver, BC, Canada. luke.haliburton@ifi.lmu.de.

International Journal of Computer Assisted Radiology and Surgery
|July 23, 2020
PubMed
Summary

A new C-arm tracking system, OPTIX, uses computer vision to accurately monitor X-ray device position. This innovation aims to reduce surgical time and radiation exposure by minimizing the need for scout images.

Keywords:
C-armComputer visionOrthopedicPosition trackingRadiationTracked C-arm

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Area of Science:

  • Medical Imaging
  • Computer Vision
  • Surgical Technology

Background:

  • C-arms are essential portable X-ray devices in orthopedic surgery.
  • Current C-arm use involves significant operation time and radiation exposure due to positioning methods.
  • Existing C-arm positioning solutions are often obtrusive or lack quantitative capabilities.

Purpose of the Study:

  • To develop and verify a low-profile, real-time C-arm base-tracking system.
  • To enhance C-arm positioning accuracy and reduce reliance on scout images.
  • To provide quantitative measurement tools for improved surgical navigation.

Main Methods:

  • Development of OPTIX (On-board Position Tracking for Intraoperative X-rays) system.
  • Utilized a single downward-facing camera and computer vision algorithms for motion tracking.
  • Evaluated system accuracy in a simulated operating room environment with a real C-arm.

Main Results:

  • OPTIX achieved high accuracy in relative motion tracking (translation <0.75%, orientation <5%).
  • Repositioning accuracy with error correction was < [Formula: see text] mm translation and < [Formula: see text] rotation.
  • Consistent C-arm repositioning within 5 mm of a reference position was demonstrated.

Conclusions:

  • The OPTIX system offers clinically relevant accuracy for C-arm positioning.
  • Potential to significantly reduce the need for scout images during surgery.
  • Expected to decrease operating time and radiation exposure for patients and staff.