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Related Experiment Videos

Method for improved multiband excitation profiles using the Shinnar-Le Roux transform.

C H Cunningham1, M L Wood

  • 1Department of Medical Biophysics, University of Toronto and Sunnybrook and Women's College Health Sciences Centre, Toronto, Canada. cunning@sten.sunnybrook.utoronto.ca

Magnetic Resonance in Medicine
|September 1, 1999
PubMed
Summary
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A new method for designing multiband radiofrequency (RF) pulses in magnetic resonance imaging significantly reduces excitation profile distortion, improving image quality. This technique enhances accuracy, especially for closely spaced bands, leading to better signal localization.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radiofrequency (RF) Pulse Design
  • Signal Processing

Background:

  • Multiband RF pulses enable simultaneous excitation of multiple slices in MRI, accelerating acquisition.
  • Conventional methods for designing these pulses can lead to significant distortion, particularly when excited bands are closely spaced.
  • This distortion impacts the accuracy of slice selection and can introduce out-of-slice signal.

Purpose of the Study:

  • To introduce and theoretically outline a novel method for designing multiband RF pulses.
  • To incorporate phase correction for precise control over the phase of excited bands.
  • To demonstrate the efficacy of the new method in reducing distortion and improving signal localization compared to conventional techniques.

Main Methods:

Related Experiment Videos

  • The Shinnar-Le Roux transform was adapted for multiband RF pulse design.
  • A novel phase correction strategy was developed to control excited band phases.
  • RF pulses were designed for Hadamard and Haar wavelet encoding schemes.
  • Experimental measurements of excitation profiles and images were compared between the new and conventional methods.

    • Main Results:

    • The new method demonstrated a 78% reduction in excitation profile distortion for closely spaced bands.
    • A 52% reduction in out-of-slice signal was achieved using Haar wavelet encoding with the new method.
    • Experimental results validated the theoretical improvements in excitation profile accuracy and image quality.

    Conclusions:

    • The developed method effectively reduces distortion in multiband RF pulse excitation profiles.
    • Phase correction is crucial for accurate control of excited bands in multiband MRI.
    • This technique offers significant advantages for applications requiring precise slice selection and reduced artifacts, such as Haar wavelet encoding.