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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.
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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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Gyroscope: Precession

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Absolute Motion Analysis- 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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Quantitative Magnetic Resonance Imaging of Skeletal Muscle Disease
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Published on: December 18, 2016

Prospective Head Motion Correction in T1- and T2-Weighted Long Echo Train Sequences Using Servo Navigation.

Matthias Serger1,2, Malte Riedel3, Rüdiger Stirnberg1

  • 1MR Physics, German Center for Neurodegenerative Diseases (DZNE), Bonn, Germany.

Magnetic Resonance in Medicine
|June 23, 2026
PubMed
Summary
This summary is machine-generated.

Servo navigation effectively corrects head motion during structural brain imaging using MPRAGE and 3D-TSE sequences. This technique improves image quality, especially during long acquisitions with involuntary movements.

Keywords:
MPRAGESPACEhigh‐resolutionprospective motion correctionservo navigation

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Neuroimaging
  • Medical Physics

Background:

  • Head motion is a significant challenge in structural MRI, leading to image artifacts and reduced diagnostic accuracy.
  • Existing motion correction methods often have limitations in real-time application or effectiveness for certain motion types.

Purpose of the Study:

  • To integrate MR-based servo navigation into MPRAGE and 3D-TSE sequences.
  • To demonstrate the potential of servo navigation for prospective head motion correction in structural brain imaging.

Main Methods:

  • Servo navigators were inserted before preparation pulses (before-prep) for efficient motion parameter estimation.
  • Within-echo train correction (within-ET) was tested using reference navigators for frequent geometry updates.
  • Methods were evaluated in instructed motion experiments and high-resolution 7T scans.

Main Results:

  • Servo navigation significantly reduced artifacts from abrupt head motion in both MPRAGE and 3D-TSE sequences.
  • Within-ET correction further mitigated residual artifacts from rapid in-train motion, particularly in MPRAGE.
  • High-resolution scans showed preserved anatomical details, and image quality improved under involuntary motion during long acquisitions.

Conclusions:

  • MR-based servo navigation offers accurate, real-time head motion correction for structural brain imaging.
  • The developed servo navigation strategies enhance image quality and preserve anatomical details, even in challenging motion scenarios.