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Related Concept Videos

Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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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.
As the drone's propellers rotate, an upward force is generated that counteracts the force of gravity, enabling the drone to lift off from the ground. This initial movement of the drone is along a straight path, representing a form of translational motion. In this phase, every point on the...
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Relative Motion Analysis - Velocity01:24

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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 - Acceleration01:10

Relative Motion Analysis - Acceleration

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A slider-crank mechanism 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. The movement of the slider-crank is an example of general plane motion as the fluctuating angle between the crank and the connecting rod. Consider a segment AB where point A is at the end of the slider and point B is on the diametrically opposite end to point A, on a crack. The variance in...
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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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Relative Motion Analysis using Rotating Axes - Acceleration01:22

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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. The absolute velocity of point B is determined by adding the absolute velocity of point A, the relative velocity of point B in the rotating frame, and the effects caused by the angular velocity within the rotating frame.
Time differentiation is...
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Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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Related Experiment Video

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Flow Cytometry-Based Quantification and Analysis of Myocardial B-Cells
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Myocardial motion analysis based on an optical flow method using tagged MR images.

Daiki Tabata1,2, Haruo Isoda3,4, Kaori Kato5

  • 1Department of Radiological and Medical Laboratory Sciences, Nagoya University Graduate School of Medicine, 1-20, Daikominami 1-chome, Higashi-ku, Nagoya, Aichi, 461-8673, Japan.

Radiological Physics and Technology
|April 14, 2018
PubMed
Summary

We developed tagged MR-optical flow velocimetry (tMR-O velocimetry) for accurate heart motion analysis. This new method shows high accuracy in phantom studies and good agreement with echocardiography in volunteers.

Keywords:
EchocardiographyMyocardial motionMyocardiumOptical flowTagged MR imaging

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Area of Science:

  • Cardiovascular Imaging
  • Biomedical Engineering
  • Medical Physics

Background:

  • Accurate measurement of myocardial motion is crucial for diagnosing cardiac conditions.
  • Existing techniques may have limitations in precision or scope.
  • Tagged magnetic resonance imaging (MRI) offers detailed motion information.

Purpose of the Study:

  • To develop and validate a novel velocimetry method using tagged MRI and optical flow.
  • To assess the measurement accuracy of tagged MR-optical flow velocimetry (tMR-O velocimetry).
  • To compare tMR-O velocimetry with echocardiography for myocardial velocity assessment in humans.

Main Methods:

  • Developed tMR-O velocimetry by applying optical flow analysis to tagged MR images.
  • Utilized retrospective pseudo-electrocardiogram (ECG) gating for tagged cine MR imaging.
  • Validated accuracy using a rotating phantom with optimized imaging parameters.
  • Compared tMR-O velocimetry results with echocardiography in 10 healthy volunteers across multiple cardiac sections.

Main Results:

  • tMR-O velocimetry demonstrated high accuracy, with velocity differences less than 1% compared to reference values in phantom studies.
  • Good agreement was observed between tMR-O velocimetry and echocardiography for radial myocardial velocities (short-axis) and longitudinal velocities (long-axis).
  • The method successfully obtained myocardial velocities in various cardiac sections.

Conclusions:

  • tMR-O velocimetry is a highly accurate method for quantifying velocities.
  • The technique shows good agreement with echocardiography in healthy volunteers.
  • tMR-O velocimetry is a potentially feasible tool for analyzing human myocardial motion.