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Cardiac SSFP imaging at 3 Tesla.

Michael Schär1, Sebastian Kozerke, Stefan E Fischer

  • 1Institute for Biomedical Engineering, University of Zurich and Swiss Federal Institute of Technology, Zurich, Switzerland.

Magnetic Resonance in Medicine
|April 6, 2004
PubMed
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This study optimized cardiac magnetic resonance imaging (MRI) using balanced steady-state free precession (SSFP) at 3.0T. The new protocol enhances image quality and reduces scan times for better cardiac function assessment.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Cardiovascular Imaging

Background:

  • Balanced steady-state free precession (SSFP) is crucial for cardiac function assessment due to excellent myocardium-blood contrast and high signal-to-noise ratio (SNR).
  • Current SSFP cardiac imaging is predominantly performed at 1.5T, but higher field strengths offer potential SNR improvements.

Purpose of the Study:

  • To implement and optimize cardiac SSFP imaging at 3.0T.
  • To address challenges associated with higher magnetic fields, including field inhomogeneities, altered T(1) relaxation times, and power deposition limits.

Main Methods:

  • Developed an optimized SSFP sequence protocol for 3.0T cardiac imaging.
  • Utilized localized linear or second-order shimming and local resonance frequency optimization.
  • Incorporated sensitivity encoding (SENSE) to reduce breath-hold duration, leveraging the increased SNR.

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Main Results:

  • Achieved high SNR and excellent contrast for cardiac imaging at 3.0T.
  • Successfully acquired short-axis, long-axis, and four-chamber cine views in healthy subjects.
  • Identified and discussed three common artifact types with potential mitigation strategies.

Conclusions:

  • Optimized SSFP protocols enable high-quality cardiac imaging at 3.0T.
  • The protocol effectively manages challenges of higher field strengths.
  • This advancement holds promise for improved cardiac function assessment using MRI.