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Large dynamic range relative B1+ mapping.

Francesco Padormo1, Aaron T Hess2, Paul Aljabar1

  • 1King's College London, Division of Imaging Sciences and Biomedical Engineering, The Rayne Institute, St Thomas' Hospital, London, United Kingdom.

Magnetic Resonance in Medicine
|August 27, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces a new method for creating accurate relative B1+ maps, essential for parallel transmission (PTx) MRI, especially in challenging high-field scenarios with wide dynamic range transmit fields.

Keywords:
B1 mappingparallel transmissionultrahigh field MRI

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Area of Science:

  • Magnetic Resonance Imaging
  • Radiofrequency Physics

Background:

  • Parallel transmission (PTx) in MRI requires precise knowledge of B1+ fields.
  • Large dynamic range in transmit fields complicates accurate B1+ mapping.

Purpose of the Study:

  • To develop a method for generating high-quality relative B1+ maps in the presence of large dynamic range transmit fields.
  • To enable advanced PTx applications in challenging ultrahigh-field MRI scenarios.

Main Methods:

  • Acquisition of spoiled gradient echo (SPGR) images at multiple radiofrequency drive levels.
  • Combination of images using maximum likelihood estimation based on the SPGR signal equation.
  • Calculation of relative B1+ maps through image ratios.

Main Results:

  • Numerical simulations confirmed accurate reconstruction of relative transmit sensitivities across various B1+ amplitudes and SNR levels.
  • Method validated against an alternative B1+ mapping technique at 3 Tesla.
  • Successful in vivo demonstration of the method at 7 Tesla.

Conclusions:

  • The developed method effectively produces relative B1+ maps even with large dynamic range transmit fields.
  • This technique facilitates the application of PTx in demanding ultrahigh-field MRI environments.
  • The findings support broader implementation of PTx for improved MRI performance.