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Time-optimal design for multidimensional and parallel transmit variable-rate selective excitation.

Daeho Lee1, Michael Lustig, William A Grissom

  • 1Department of Electrical Engineering, Magnetic Resonance Systems Research Laboratory, Stanford University, Stanford, California, USA. daeho@mrsrl.stanford.edu

Magnetic Resonance in Medicine
|April 15, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a new time-optimal algorithm for variable-rate selective excitation (VERSE) pulse design. This method simplifies designing multidimensional and parallel transmit pulses while reducing radio frequency power and specific absorption rate (SAR).

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radio Frequency (RF) Pulse Design
  • Biomedical Engineering

Background:

  • Variable-rate selective excitation (VERSE) is a crucial RF pulse reshaping technique in MRI.
  • VERSE aims to reduce peak RF magnitude and specific absorption rate (SAR) while maintaining excitation profiles.
  • Existing VERSE methods can be complex, especially for multidimensional and parallel transmit applications.

Purpose of the Study:

  • To present a general time-optimal VERSE algorithm for multidimensional and parallel transmit pulses.
  • To simplify the design process for VERSE pulses, making them more accessible.
  • To achieve effective SAR reduction by minimizing peak RF power within a fixed pulse duration.

Main Methods:

  • Developed a noniterative, time-optimal VERSE algorithm.
  • Translated peak RF amplitude constraints into gradient waveform upper bounds in excitation k-space.
  • Integrated these bounds into a time-optimal gradient waveform design technique for pulse generation.

Main Results:

  • The algorithm achieves time optimality by optimizing gradient waveforms.
  • Effective reduction in peak RF magnitude and SAR is demonstrated.
  • The method provides a simplified, noniterative solution for complex multidimensional and parallel transmit pulses.

Conclusions:

  • The presented time-optimal VERSE algorithm offers a significant simplification for designing advanced RF pulses.
  • This approach effectively reduces RF power and SAR, enhancing MRI safety and efficiency.
  • The method is validated for 1D, 2D single-channel, and 2D parallel transmit pulse designs.