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Related Experiment Videos

Accelerating MRI by skipped phase encoding and edge deghosting (SPEED).

Qing-San Xiang1

  • 1Department of Radiology, University of British Columbia, Vancouver, Canada. xiang@physics.ubc.ca

Magnetic Resonance in Medicine
|April 22, 2005
PubMed
Summary
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A new fast MRI technique, skipped phase encoding and edge deghosting (SPEED), significantly cuts scan times. This method effectively removes aliasing artifacts, enabling quicker imaging without compromising image quality.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Image Reconstruction
  • Medical Imaging Technology

Background:

  • MRI scans can be time-consuming, limiting patient comfort and throughput.
  • Aliasing artifacts, or 'ghosts', can degrade image quality in fast MRI sequences.
  • Existing methods for artifact reduction may introduce their own limitations or require longer scan times.

Purpose of the Study:

  • To introduce and validate a novel fast MRI technique called skipped phase encoding and edge deghosting (SPEED).
  • To demonstrate SPEED's ability to reduce scan time while maintaining image quality and eliminating aliasing artifacts.
  • To explore the potential applications of SPEED in various MRI scenarios, including MR angiography (MRA).

Main Methods:

  • Developed a sparse k-space sampling strategy with interleaved datasets and controlled phase encoding (PE) shifts.

Related Experiment Videos

  • Applied 2D Fourier Transform (2DFT) reconstruction and differential filtering for edge enhancement and ghost identification.
  • Utilized a least-square error minimization approach to model and resolve ghosting artifacts from three equations.
  • Generated deghosted images by inverse filtering the averaged deghosted-edge map, incorporating central k-space data.

    • Main Results:

    • Demonstrated significant reduction in MRI scan time using the SPEED method on in vivo data.
    • Achieved substantial artifact reduction, specifically aliasing ghosts, without noticeable degradation of image quality.
    • Showcased the effectiveness of SPEED in scenarios with sparse signals, such as MR angiography (MRA).

    Conclusions:

    • SPEED is an effective and independent method for accelerating MRI acquisition and reducing aliasing artifacts.
    • The technique offers considerable scan time savings with minimal impact on image quality.
    • SPEED can be integrated with other acceleration methods for further advancements in fast MRI.