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Related Experiment Videos

Fluctuating equilibrium MRI.

S S Vasanawala1, J M Pauly, D G Nishimura

  • 1Magnetic Resonance Systems Research Laboratory, Department of Electrical Engineering, Stanford University, Stanford, California 94305-9510, USA. vasanawala@stanford.edu

Magnetic Resonance in Medicine
|November 5, 1999
PubMed
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A novel fluctuating equilibrium magnetic resonance technique enables rapid, simultaneous acquisition of multiple MRI images with distinct contrast features, including lipid and water. This method allows for adjustable echo times, enhancing contrast control for various applications.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Physics

Background:

  • Conventional MRI sequences can be time-consuming, limiting imaging speed and contrast options.
  • Simultaneous acquisition of different image contrasts (e.g., lipid and water) is challenging with existing methods.

Purpose of the Study:

  • To introduce a new, fast, spectrally selective MRI method: fluctuating equilibrium magnetic resonance (FEMR).
  • To demonstrate the capability of FEMR for simultaneous acquisition of images with different contrast features.

Main Methods:

  • FEMR utilizes refocused gradients and specific radiofrequency pulse phase schedules to create fluctuating equilibrium magnetization.
  • The effective echo time is adjustable via the flip angle, controlling T(2) contrast contributions.
  • The technique allows for rapid acquisition of lipid and water images.

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Main Results:

  • Simultaneous acquisition of multiple images with varying contrast is achievable.
  • Lipid and water images can be rapidly acquired.
  • Effective control over T(2) contrast is demonstrated through flip angle adjustment.

Conclusions:

  • FEMR is a versatile technique for fast, spectrally selective MRI.
  • The method shows promise for various applications including musculoskeletal, abdominal, breast, brain imaging, and MR angiography.
  • A novel approach for combining lipid and water images for angiography is presented.