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Reduced k-space encoding for dual-contrast TrueFISP imaging.

Robert Merrifield1, Jennifer Keegan, David Firmin

  • 1Royal Society/Wolfson Foundation MIC Laboratory, Imperial College of Science, Technology and Medicine, London, UK.

Magnetic Resonance in Medicine
|February 21, 2003
PubMed
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Dual-contrast TrueFISP imaging uses varied RF pulses for better contrast but takes too long. This study compares reduced k-space sampling methods, RIGR and key-hole imaging, to shorten scan times for clinical use.

Area of Science:

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

Background:

  • Dual-contrast TrueFISP imaging enhances contrast and enables tissue classification using multiple RF flip-angles.
  • The clinical utility of this technique is limited by its prolonged imaging duration.

Purpose of the Study:

  • To evaluate the effectiveness of two k-space undersampling techniques in reducing the acquisition time for dual-contrast TrueFISP imaging.
  • To compare reduced imaging using generalized series reconstruction (RIGR) and key-hole imaging for time efficiency.

Main Methods:

  • Theoretical and practical assessment of RIGR and key-hole imaging techniques.
  • Utilized 3D cine MRI datasets from eight healthy subjects for evaluation.

Main Results:

Related Experiment Videos

  • Both RIGR and key-hole imaging significantly reduce imaging time compared to standard dual-contrast TrueFISP.
  • Quantitative and qualitative comparisons demonstrated the feasibility of accelerated acquisition.

Conclusions:

  • Reduced k-space sampling techniques, specifically RIGR and key-hole imaging, are viable for accelerating dual-contrast TrueFISP MRI.
  • These methods hold promise for improving the clinical applicability of contrast-enhanced MRI sequences.