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Related Concept Videos

Relative Motion Analysis using Rotating Axes01:25

Relative Motion Analysis using Rotating Axes

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.
However, to express the relative position of point B relative to point A, an additional frame of reference, denoted as x'y', is necessary. This additional frame not only translates but also rotates relative to the fixed frame, making it instrumental in...
Absolute Motion Analysis- General Plane Motion01:24

Absolute Motion Analysis- General Plane Motion

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 drone...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

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.
When an external force is exerted, it sets the crank into a rotational movement. This, in turn, instigates the motion of the connecting rod, leading to what is referred to as a general plane motion. This process involves two key points - point A on the connecting rod...
Relative Motion Analysis using Rotating Axes-Problem Solving01:29

Relative Motion Analysis using Rotating Axes-Problem Solving

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.
Here, in order to determine the magnitude of velocity and acceleration for point...
Ultrasound II: Endoscopic Ultrasound and FibroScan01:25

Ultrasound II: Endoscopic Ultrasound and FibroScan

Endoscopic Ultrasound (EUS) and FibroScan are valuable diagnostic tools in gastroenterology and hepatology, each with specific applications and techniques.
Endoscopic Ultrasound (EUS):
Relative Motion Analysis - Acceleration01:10

Relative Motion Analysis - Acceleration

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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Related Experiment Video

Updated: Jun 28, 2026

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
06:56

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation

Published on: January 7, 2021

Real-time liver motion compensation for MRgFUS.

James C Ross1, Rekha Tranquebar, Dattesh Shanbhag

  • 1GE Global Research, Niskayuna NY 12309, USA.

Medical Image Computing and Computer-Assisted Intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention
|November 6, 2008
PubMed
Summary

MR-guided focused ultrasound (MRgFUS) can now treat liver lesions by compensating for organ motion. This non-invasive technique uses feature tracking and interpolation for precise, real-time targeting.

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Real-time Video Projection in an MRI for Characterization of Neural Correlates Associated with Mirror Therapy for Phantom Limb Pain
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Real-time Video Projection in an MRI for Characterization of Neural Correlates Associated with Mirror Therapy for Phantom Limb Pain

Published on: April 20, 2019

Related Experiment Videos

Last Updated: Jun 28, 2026

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
06:56

Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation

Published on: January 7, 2021

Real-time Video Projection in an MRI for Characterization of Neural Correlates Associated with Mirror Therapy for Phantom Limb Pain
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Real-time Video Projection in an MRI for Characterization of Neural Correlates Associated with Mirror Therapy for Phantom Limb Pain

Published on: April 20, 2019

Area of Science:

  • Medical Imaging
  • Interventional Radiology
  • Acoustic Surgery

Background:

  • MR-guided focused ultrasound (MRgFUS) is effective for treating solid tumors like uterine fibroids.
  • Organ motion in the liver prevents MRgFUS application due to the need for precise targeting.
  • Existing methods lack real-time motion compensation for liver MRgFUS.

Purpose of the Study:

  • To develop and validate a novel motion compensation method for MRgFUS liver lesion treatment.
  • To enable continuous ultrasound energy delivery despite liver organ movement.
  • To achieve sub-pixel accuracy in real-time liver lesion targeting.

Main Methods:

  • Implementing a real-time feature tracking system to monitor salient anatomical landmarks (e.g., blood vessels).
  • Utilizing a thin plate spline (TPS) interpolation scheme to update target coordinates based on tracked features.
  • Validating the method on both synthetic datasets and MRI sequences from human subjects.

Main Results:

  • Demonstrated sub-pixel tracking accuracy for liver motion compensation.
  • Achieved per-feature tracking times of 5.7ms ± 1.6ms, suitable for real-time MRgFUS.
  • Successfully adapted MRgFUS for potential liver lesion treatment by addressing organ motion.

Conclusions:

  • The developed motion compensation technique enables MRgFUS application in the liver.
  • This method allows for precise, real-time targeting of liver lesions during non-invasive ablation.
  • This innovation expands the therapeutic potential of MRgFUS to abdominal organs.