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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...

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Related Experiment Video

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Sample Drift Correction Following 4D Confocal Time-lapse Imaging
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Sample Drift Correction Following 4D Confocal Time-lapse Imaging

Published on: April 12, 2014

Improved motion correction capabilities for fast spin echo T1 FLAIR propeller using non-cartesian external

James H Holmes1, Philip J Beatty, Howard A Rowley

  • 1Global Applied Science Laboratory, GE Healthcare, Madison, Wisconsin 53705-2275, USA. james.h.holmes@ge.com

Magnetic Resonance in Medicine
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

This study introduces a novel parallel imaging method to improve motion correction in fast spin echo longitudinal relaxation time fluid-attenuating inversion recovery (FLAIR) MRI. The technique enhances image quality and robustness during patient motion.

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Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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Last Updated: May 24, 2026

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Registered Bioimaging of Nanomaterials for Diagnostic and Therapeutic Monitoring
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Published on: December 9, 2010

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Patient motion is a significant challenge in clinical MRI, particularly for Fast Spin Echo (FSE) sequences like Longitudinal Relaxation Time Fluid Attenuating Inversion Recovery (T1-FLAIR).
  • Existing motion correction methods, such as Periodically Rotated Overlapping Parallel Lines with Enhanced Reconstruction (PROPELLER), face limitations with T1-FLAIR due to the need for wide blades and short echo train lengths.
  • Parallel imaging offers potential for increased effective blade width but conventional methods have limitations in acceleration.

Purpose of the Study:

  • To develop and evaluate a novel non-Cartesian parallel imaging method for robust motion correction in T1-FLAIR MRI.
  • To overcome the challenges of acquiring wide blades while maintaining short echo train lengths for effective motion correction in T1-FLAIR.

Main Methods:

  • A coil-by-coil, data-driven, autocalibrated parallel imaging method using the APPEAR (Autocalibrated SPARSE-SENSE) technique was employed.
  • A single calibration dataset was shared across all imaging blades on a slice-by-slice basis.
  • The proposed method was compared against conventional Cartesian and PROPELLER methods.

Main Results:

  • The APPEAR method achieved an effective blade width increase of 2.45×, enabling robust motion correction.
  • Significant improvements in image quality and motion correction were observed during subject motion compared to conventional methods.
  • High image quality was maintained in the absence of motion in both healthy and clinical volunteers.

Conclusions:

  • The proposed APPEAR-based parallel imaging method effectively enhances blade width, facilitating robust motion correction in T1-FLAIR MRI.
  • This technique offers a promising solution for improving diagnostic accuracy in clinical settings where patient motion is prevalent.
  • The method demonstrates excellent performance, maintaining high image quality under both motion and no-motion conditions.