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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.
Here, in order to determine the magnitude of velocity and acceleration for point...
Gyroscope: Precession01:24

Gyroscope: Precession

Precession can be demonstrated effectively through a spinning top. If a spinning top is placed on a flat surface near the surface of the Earth at a vertical angle and is not spinning, it will fall over due to the force of gravity producing a torque acting on its center of mass. However, if the top is spinning on its axis, it precesses about the vertical direction, rather than topple over due to this torque. Precessional motion is a combination of a steady circular motion of the axis and the...
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 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...
Curvilinear Motion: Rectangular Components01:23

Curvilinear Motion: Rectangular Components

Curvilinear motion characterizes the movement of a particle or object along a curved path, notably evident when envisioning a car navigating a winding road. If the car starts at point A, its position vector is established within a fixed frame of reference, where the ratio of the position vector to its magnitude signifies the unit vector pointing in the position vector's direction.
As the car advances, its position evolves over time. Quantifying the car's velocity involves computing the time...

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Related Experiment Video

Updated: May 22, 2026

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography
06:09

Measuring 3D In-vivo Shoulder Kinematics using Biplanar Videoradiography

Published on: March 12, 2021

Prospective motion correction using tracking coils.

Lei Qin1, Ehud J Schmidt, Zion Tsz Ho Tse

  • 1Department of Radiology, Dana-Farber Cancer Institute, Boston, Massachusetts 02215, USA. lei_qin@dfci.harvard.edu

Magnetic Resonance in Medicine
|May 9, 2012
PubMed
Summary
This summary is machine-generated.

Prospective motion correction using tracking coils significantly improves MRI image quality by reducing motion artifacts. This technique enables clearer intracavity imaging by stabilizing the view within the body.

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Magnetic Resonance Imaging

Background:

  • Intracavity imaging coils offer superior signal-to-noise and potential for higher resolution compared to surface coils.
  • Physiologically induced motion artifacts are a significant challenge in intracavity MRI, degrading image quality.

Purpose of the Study:

  • To develop and evaluate prospective motion-correction techniques for intracavity MRI using an array of tracking coils.
  • To assess the feasibility of integrating prospective motion correction into future intracavity imaging systems.

Main Methods:

  • Developed a prospective motion-correction system with <50 ms latency between tracking and imaging.
  • Tested 2D gradient-recalled and 3D ECG-gated inversion-recovery-fast-gradient-echo sequences.
  • Validated the system using ex vivo hearts on a motion platform and human abdominal imaging.

Main Results:

  • The tracking array achieved high positional accuracy (0.7±0.5 mm X, 0.6±0.4 mm Y, 0.1±0.1 mm Z) at 20 frames-per-second.
  • Demonstrated significant improvements in image quality for both in-plane and through-plane motion correction.
  • Confirmed the feasibility of the motion-correction approach in simulated and human studies.

Conclusions:

  • Prospective motion correction using tracking coils is effective in mitigating motion artifacts in MRI.
  • The developed system shows promise for enhancing intracavity MRI by providing stable imaging frames.
  • This technology lays the groundwork for future combined tracking and intracavity coil designs.