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Related Experiment Videos

Phase contrast using multiecho steady-state free precession.

Vinay M Pai1

  • 1Department of Radiology, New York University School of Medicine, New York, NY 10016, USA. paiv01@med.nyu.edu

Magnetic Resonance in Medicine
|July 27, 2007
PubMed
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New multiecho steady-state free precession (SSFP) phase-contrast (PC) MRI methods improve temporal resolution. These techniques enhance scan efficiency for better cardiovascular imaging without compromising image quality.

Area of Science:

  • Magnetic Resonance Imaging
  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Conventional phase-contrast (PC) MRI has limitations in temporal resolution due to bipolar velocity encoding gradients.
  • Steady-state free precession (SSFP) offers higher acquisition rates for PC MRI without sacrificing contrast-to-noise ratio (CNR).

Purpose of the Study:

  • To present and evaluate two novel multiecho SSFP PC implementations for increased time efficiency.
  • To enable TR-equivalent temporal resolutions by acquiring reference lines within the same TR as flow-encoded lines.

Main Methods:

  • Development and implementation of two multiecho SSFP PC approaches: extrinsic and intrinsic.
  • Testing of both methods on human volunteers at 1.5T and 3T MRI scanners.

Related Experiment Videos

Main Results:

  • Both extrinsic and intrinsic multiecho SSFP PC methods successfully minimized scan time.
  • The intrinsic approach is suitable for higher in-plane velocity encoding.
  • The extrinsic approach allows for a broader range of velocity encoding in and through the imaging plane.

Conclusions:

  • Multiecho SSFP PC MRI significantly enhances temporal resolution and scan efficiency.
  • These methods offer flexibility for studying various flow velocities in cardiovascular applications.
  • Successful in-vivo validation demonstrates the clinical potential of these advanced PC MRI techniques.