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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...
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.
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Azimuths and Bearings01:19

Azimuths and Bearings

Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...
Relative Motion Analysis - Velocity01:24

Relative Motion Analysis - Velocity

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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.
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Relative Motion Analysis using Rotating Axes - Acceleration01:22

Relative Motion Analysis using Rotating Axes - Acceleration

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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Neuronavigated Focalized Transcranial Direct Current Stimulation Administered During Functional Magnetic Resonance Imaging
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Neuronavigated Focalized Transcranial Direct Current Stimulation Administered During Functional Magnetic Resonance Imaging

Published on: November 15, 2024

Head motion detection using FID navigators.

Tobias Kober1, José P Marques, Rolf Gruetter

  • 1Laboratory for Functional and Metabolic Imaging, Ecole Polytechnique Fédérale de Lausanne, Switzerland. tobias.kober@epfl.ch

Magnetic Resonance in Medicine
|February 22, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a novel method for detecting subject motion during brain MRI scans using ultrashort free induction decay signals. This technique offers sensitive motion detection with minimal impact on scan timing and image quality.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Neuroscience

Background:

  • Subject motion is a significant challenge in Magnetic Resonance Imaging (MRI), leading to image artifacts and reduced diagnostic accuracy.
  • Existing motion detection and correction methods can be complex, time-consuming, or impact image quality.
  • High channel-count Radio Frequency (RF) coil arrays offer potential for novel signal acquisition strategies.

Purpose of the Study:

  • To develop and validate a concept for real-time motion detection in brain MRI using ultrashort free induction decay (FID) signals.
  • To assess the sensitivity of FID signal variations to common subject motion patterns.
  • To evaluate the feasibility of integrating this motion detection method into standard MRI sequences without compromising scan parameters.

Main Methods:

  • Utilized ultrashort (<100 μsec) free induction decay (FID) signals acquired with high channel-count RF coil arrays.
  • Compared FID signals against a reference FID signal to detect motion-induced variations.
  • Implemented the method within a standard structural MRI sequence for proof-of-concept.
  • Validated signal stability using phantom experiments and demonstrated sensitivity in human subjects.

Main Results:

  • Phantom experiments confirmed the stability of the FID signal under controlled conditions.
  • Human experiments showed that variations in navigator FID data accurately detected common subject motion.
  • The proposed method demonstrated sensitivity to relevant motion patterns without significant impact on sequence timing or image contrast.

Conclusions:

  • The proposed methodology provides a sensitive and non-disruptive approach for monitoring subject motion during MRI examinations.
  • This technique can serve as a valuable complement to existing motion detection and correction strategies.
  • Implementing this method has the potential to further reduce motion-induced artifacts and improve the reliability of MR imaging.