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Complementary radial tagging for improved myocardial tagging contrast.

Zhe Wang1, Abbas Nasiraei-Moghaddam, Meral L Reyhan

  • 1Department of Radiological Sciences, University of California, Los Angeles, California, USA; Department of Bioengineering, University of California, Los Angeles, California, USA.

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Summary

Complementary radial tagging (CRT) enhances myocardial tagging contrast throughout the cardiac cycle. This new technique ensures high-quality tag patterns in nearly all patients, improving cardiac MRI diagnostics.

Keywords:
complementary radial taggingcomplementary spatial modulation of magnetizationmyocardial taggingspatial modulation of magnetization

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Area of Science:

  • Cardiovascular Magnetic Resonance Imaging
  • Medical Imaging Techniques

Background:

  • Myocardial tagging is crucial for assessing cardiac function.
  • Maintaining tag contrast throughout the cardiac cycle is a challenge in traditional methods.

Purpose of the Study:

  • To develop and evaluate complementary radial tagging (CRT) for enhanced myocardial tagging contrast.
  • CRT aims to preserve radial tag contrast throughout the entire cardiac cycle.

Main Methods:

  • CRT acquires two image sets with phase-shifted tag patterns.
  • A ramped imaging flip angle and image subtraction improve tag contrast.
  • A small table shift optimizes radial tag pattern uniformity, validated with 500 patient cases.

Main Results:

  • Simulations, phantom experiments, and in vivo images show improved tag contrast with CRT versus standard radial tagging (RT).
  • CRT enabled acquisition of acceptable images in over 98% of clinical exams.

Conclusions:

  • The CRT technique significantly improves radial tag contrast.
  • CRT is expected to yield high-quality tag patterns in nearly all patients, enhancing diagnostic utility.