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Related Experiment Videos

Simultaneous echo refocusing in EPI.

David A Feinberg1, Timothy G Reese, Van J Wedeen

  • 1Advanced MRI Technologies, LLC, Sebastopol, California 95472, USA. david.feinberg@advancedmri.com

Magnetic Resonance in Medicine
|July 12, 2002
PubMed
Summary
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Simultaneous Echo Refocusing (SER) encodes multiple 2D Fourier Transform (2D FT) images in one echo train, enabling faster MRI scans. This novel method accelerates multislice imaging and supports real-time physiologic data acquisition.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Image Acquisition Techniques
  • Signal Processing

Background:

  • Conventional multislice imaging relies on repeated single-shot echo trains.
  • Existing echo planar imaging (EPI) sequences are limited by gradient switching and preparation pulses.
  • Faster acquisition is crucial for dynamic MRI applications.

Purpose of the Study:

  • To introduce a novel method for encoding multiple 2D Fourier Transform (2D FT) images within a single echo train.
  • To present Simultaneous Echo Refocusing (SER) as an advancement over traditional EPI sequences.
  • To enable faster, simultaneous acquisition of spatially separated physiologic information.

Main Methods:

  • Developed Simultaneous Echo Refocusing (SER), a technique that encodes multiple 2D FT images in a single echo train.

Related Experiment Videos

  • Utilized a shared refocusing process for simultaneous slice acquisition.
  • Reduced gradient switching and preparation pulses compared to conventional multislice EPI.

    • Main Results:

    • SER acquires multiple slices in a single-shot echo train, departing from repeated single-shot EPI.
    • The technique achieves faster data acquisition by minimizing gradient switching and preparation pulses.
    • Enabled simultaneous recording of multiple, spatially separated physiologic information sources in subsecond acquisitions.

    Conclusions:

    • SER offers a faster alternative to conventional multislice EPI for MRI.
    • The method facilitates subsecond image acquisitions with enhanced temporal coherence.
    • SER supports advanced MRI applications like velocity vector field mapping and brain activation mapping.