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Single-shot EPI for ASL-CMR.

Ahsan Javed1, Krishna S Nayak1

  • 1Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, California.

Magnetic Resonance in Medicine
|February 16, 2020
PubMed
Summary
This summary is machine-generated.

Single-shot echo planar imaging (SS-EPI) is a viable alternative to bSSFP for arterial-spin-labeled cardiac MR (ASL-CMR). This technique enhances spatial coverage without extending scan times, offering a promising advancement for cardiac imaging.

Keywords:
arterial spin labelinginner volume imagingmyocardial perfusionreduced field of view imagingsingle-shot echo planar imaging

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Area of Science:

  • Cardiovascular Magnetic Resonance Imaging
  • Medical Imaging Techniques
  • Physiology

Background:

  • Arterial-spin-labeled cardiac MR (ASL-CMR) is crucial for assessing myocardial perfusion.
  • Snapshot balanced steady state free precession (bSSFP) is a common but time-consuming method for ASL-CMR.
  • Optimizing ASL-CMR protocols is essential for improving diagnostic accuracy and efficiency.

Purpose of the Study:

  • To evaluate single-shot echo planar imaging (SS-EPI) as an alternative to bSSFP for ASL-CMR at 3T.
  • To demonstrate the feasibility of sequential multi-slice ASL-CMR using SS-EPI without increasing scan time.

Main Methods:

  • Developed and optimized a reduced field of view SS-EPI sequence with a 2D radiofrequency pulse and optimized spin-echo crushers.
  • Evaluated SS-EPI against bSSFP for single-slice ASL-CMR in healthy volunteers during systole and diastole.
  • Demonstrated sequential multi-slice ASL-CMR using SS-EPI in volunteers during both cardiac phases.

Main Results:

  • Global myocardial perfusion values obtained with SS-EPI were statistically equivalent to those from bSSFP.
  • Sequential multi-slice SS-EPI achieved comparable myocardial perfusion values across different cardiac levels (basal, mid, apical).
  • The SS-EPI technique demonstrated potential for 3-fold (diastole) and 2-fold (systole) improvement in spatial coverage.

Conclusions:

  • SS-EPI is a promising alternative imaging technique for ASL-CMR.
  • SS-EPI offers enhanced spatial coverage compared to bSSFP without compromising scan time.
  • This advancement could significantly improve the clinical utility of ASL-CMR for myocardial perfusion assessment.