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Optimizing the sequence parameters for double-quantum CRAZED imaging.

J P Marques1, R Bowtell

  • 1Sir Peter Mansfield Magnetic Resonance Centre, School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, UK.

Magnetic Resonance in Medicine
|January 6, 2004
PubMed
Summary
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Optimizing the double-quantum-(DQ)-CRAZED sequence enhances distant dipole field (DDF) signal detection. Phase cycling eliminates unwanted signals, improving signal-to-noise ratio (SNR) for better DDF imaging.

Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Pulse Sequence Design

Background:

  • The double-quantum-(DQ)-CRAZED sequence is sensitive to the distant dipole field (DDF).
  • Optimizing sequence parameters is crucial for maximizing signal-to-noise ratio (SNR).
  • Understanding magnetization evolution is key to improving DDF signal detection.

Purpose of the Study:

  • To analyze magnetization evolution in DQ-CRAZED sequences.
  • To identify sequence parameters that maximize DDF sensitivity.
  • To describe phase cycling schemes for signal optimization.

Main Methods:

  • Simulations and imaging experiments at 3 T.
  • Analysis of magnetization evolution under repeated DQ-CRAZED sequence application.

Related Experiment Videos

  • Phantom and human head imaging.

    • Main Results:

    • Without phase cycling, maximum SNR/time is achieved with TR=2.05 T1, alpha≈90°, beta≈60°, and TE=T2.
    • Stimulated echo effects can contribute up to 40% signal at TR=2.05 T1.
    • A two-step phase cycle eliminates stimulated echoes, with maximum SNR/time at TR=2.76 T1.
    • Sensitivity to T2 variations is maximized at TE=2T2.

    Conclusions:

    • Optimized DQ-CRAZED sequence parameters significantly enhance DDF signal detection.
    • Phase cycling is essential for eliminating stimulated echoes and maximizing SNR.
    • The study provides guidance for optimizing DQ-CRAZED sequences for DDF imaging.