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Related Experiment Videos

Pulses with fixed magnitude and variable phase response profiles

S Pickup1, X Ding

  • 1Department of Radiology, University of Missouri-Hospitals and Clinics, Columbia 65211, USA.

Magnetic Resonance in Medicine
|May 1, 1995
PubMed
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The Shinnar-Le Roux (SLR) method for pulse design now allows phase modulation without altering magnitude profiles. This advance enables tailored phase responses for various applications, enhancing pulse envelope design flexibility.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Signal Processing

Background:

  • The Shinnar-Le Roux (SLR) method efficiently designs pulse envelopes for MRI, enabling nearly arbitrary magnitude response profiles.
  • A key limitation of the SLR method is its restricted control over the phase response profile.
  • Precise control over both magnitude and phase is crucial for advanced MRI applications.

Purpose of the Study:

  • To introduce a novel modification to the SLR method for modulating pulse envelope phase profiles.
  • To demonstrate that phase modulation can be achieved without compromising the desired magnitude profile.
  • To enable interactive tailoring of phase profiles for specific user requirements in MRI pulse design.

Main Methods:

  • The proposed method involves replacing specific roots of the SLR polynomials with their complex conjugates.

Related Experiment Videos

  • This root manipulation modifies the phase response while preserving the magnitude response.
  • The technique allows for the generation of pulses with user-defined phase characteristics.

    • Main Results:

    • Demonstrated successful modulation of the phase response profile without affecting the magnitude profile.
    • Generated a variety of useful pulses with tailored phase characteristics.
    • Presented examples of these novel pulses and their corresponding response profiles.

    Conclusions:

    • The modified SLR method provides enhanced control over pulse envelope phase profiles.
    • This technique offers greater flexibility for designing MRI pulses with specific phase properties.
    • The approach facilitates the development of new pulse sequences for diverse imaging needs.