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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 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.
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...
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Steady, Laminar Flow Between Parallel Plates01:17

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Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
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Deformation in a Circular Shaft01:10

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One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
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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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Gyroscope: Precession01:24

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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...
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Updated: May 7, 2026

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel
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Improved motion correction in PROPELLER by using grouped blades as reference.

Zhe Liu1, Zhe Zhang, Kui Ying

  • 1Center for Biomedical Imaging Research, Department of Biomedical Engineering, Tsinghua University, Beijing, People's Republic of China.

Journal of Magnetic Resonance Imaging : JMRI
|October 15, 2013
PubMed
Summary
This summary is machine-generated.

A new grouped-blade reference (GBR) method improves Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction (PROPELLER) MRI. GBR enhances motion correction accuracy and robustness, reducing image errors and computational cost.

Keywords:
MRIPROPELLERpattern classificationreference generationrigid motion correction

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Reconstruction

Background:

  • PROPELLER (Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction) is a vital MRI technique.
  • Motion artifacts significantly degrade PROPELLER image quality.
  • Existing reference generation methods (SBR, CBR) have limitations in handling complex motion.

Purpose of the Study:

  • To introduce and evaluate a novel reference generation method for PROPELLER MRI.
  • To enhance the robustness and accuracy of motion correction in PROPELLER reconstructions.
  • To reduce the computational cost associated with PROPELLER image correction.

Main Methods:

  • A Grouped-Blade Reference (GBR) method was developed for calculating rotation and translation shifts in PROPELLER.
  • GBR classifies and groups blades based on relative correlations, preventing data interference.
  • Performance was evaluated using numerical simulations and in vivo experiments, comparing GBR against Single-Blade Reference (SBR) and Combined-Blade Reference (CBR).

Main Results:

  • GBR-based PROPELLER demonstrated superior correction for random and bipolar motion compared to SBR and CBR.
  • Images reconstructed using GBR exhibited a lower error level.
  • The GBR method required fewer iteration steps for convergence, indicating improved computational efficiency.

Conclusions:

  • The Grouped-Blade Reference (GBR) method offers a significant advancement for PROPELLER MRI.
  • GBR improves the accuracy and robustness of motion correction across diverse motion patterns.
  • This method contributes to higher quality MRI reconstructions with reduced artifacts.