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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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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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Absolute Motion Analysis- General Plane Motion01:24

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Visualize a drone, with its propellers spinning rapidly, hovering mid-air. The fascinating movements and operations of this drone can be comprehended by applying the principle of general plane motion.
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Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

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A stroke engine has a slider-crank mechanism that converts rotational motion from the crank into linear motion of the slider or vice versa. This mechanism consists of three main parts: the crank, the connecting rod, and the slider.
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

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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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Three-Dimensional Finger Motion Tracking during Needling: A Solution for the Kinematic Analysis of Acupuncture Manipulation
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A Real-Time Endoscope Motion Tracker.

Ian H D Phillips1, David Armstrong2, Qiyin Fang1,3

  • 1School of Biomedical EngineeringMcMaster University Hamilton ON L8S 4L7 Canada.

IEEE Journal of Translational Engineering in Health and Medicine
|December 2, 2022
PubMed
Summary
This summary is machine-generated.

A new dual-modality endoscope tracker precisely measures position and rotation in real time. This system minimizes cumulative errors, enhancing colonoscopy accuracy for lesion localization and training.

Keywords:
Colonoscopyendoscopesmedical devicesmotion measurementreal-time systems

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Area of Science:

  • Medical Devices
  • Gastroenterology
  • Robotics

Background:

  • Accurate localization of the endoscope's distal tip is crucial in colonoscopy.
  • Current methods lack sufficient real-time motion and rotation tracking, leading to cumulative errors.

Purpose of the Study:

  • To develop and evaluate a dual-modality tracking system for real-time endoscope motion measurement.
  • To continuously correct cumulative errors in endoscope position and rotation tracking.

Main Methods:

  • A dual-modality tracking method integrating optical trackballs and cameras was developed.
  • The system measures endoscope insertion length, rotation angle, and their velocities in real time.
  • Optical trackballs recorded motion, while cameras corrected cumulative errors.

Main Results:

  • The system achieved high accuracy in measuring insertion length and rotation angle.
  • Median insertion position errors were 0.88 mm at ≤ 10 mm/s, increasing with speed.
  • Median rotation angle errors were 11° at < 40°/s, with cumulative errors significantly reduced by imaging.

Conclusions:

  • The prototype device precisely tracks endoscope position, rotation, and motion in real time with minimal cumulative error.
  • It is a small, add-on accessory compatible with existing endoscopes.
  • Potential applications include lesion localization, operational guidance, quality assurance, and training.