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Multiband RF pulse design for realistic gradient performance.

Samy Abo Seada1, Anthony N Price1, Torben Schneider2

  • 1School of Biomedical Engineering & Imaging Sciences, King's College London, King's Health Partners, St Thomas' Hospital, London, SE1 7EH.

Magnetic Resonance in Medicine
|October 3, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel radiofrequency (RF) pulse design for simultaneous multi-slice imaging, significantly reducing gradient waveform bandwidth. This method minimizes image artifacts and improves efficiency in MRI scans.

Keywords:
RF pulse designVERSEgradient frequency characterizationminimum durationmultibandtime optimal

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Pulse Sequence Design
  • Radiofrequency Engineering

Background:

  • Simultaneous multi-slice (SMS) imaging relies on multiband RF pulses, which traditionally lead to long pulse durations.
  • Longer pulse durations increase echo times (spin-echo) and repetition times (gradient-echo), reducing signal-to-noise ratio (SNR) and scan speed.
  • Advanced RF pulse design using time-variable gradients can shorten pulse durations but may cause artifacts due to gradient system limitations.

Purpose of the Study:

  • To develop a time-efficient RF pulse design method for SMS imaging that inherently generates gradient waveforms with lower temporal bandwidth.
  • To mitigate image artifacts caused by the finite temporal bandwidth of gradient systems in MRI.

Main Methods:

  • Employed time-optimal Variable-Flip-Angle Echo-Train Sampling (VERSE) for designing efficient multiband RF pulses with time-variable gradients.
  • Investigated two VERSE application strategies: direct application to multiband pulses versus application to single-band pulses followed by multiband modulation.
  • Compared the performance of these approaches using simulations and experimental measurements.

Main Results:

  • Applying VERSE to single-band RF pulses before multiband modulation effectively eliminated out-of-band slice distortion.
  • This strategy significantly reduced the need for high-frequency gradient modulation.
  • The time-efficiency benefits of VERSE were preserved while mitigating gradient-related artifacts.

Conclusions:

  • A novel, time-efficient RF pulse design method has been developed for simultaneous multi-slice MRI.
  • The proposed method produces gradient pulses with lower temporal bandwidth, thereby reducing image artifacts.
  • This approach enhances the feasibility and quality of SMS imaging by addressing gradient system limitations.