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Transmit Array Spatial Encoding (TRASE) using broadband WURST pulses for RF spatial encoding in inhomogeneous B0

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  • 1A.A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, MA 02129, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 9, 2016
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Summary
This summary is machine-generated.

Transmit Array Spatial Encoding (TRASE) now works in portable MRI scanners with uneven magnetic fields. This new method uses swept RF pulses to reduce artifacts, making MRI more accessible.

Keywords:
Low field imagingPortable MRIQuadratic phase modulationSwept RF pulsesTransmit Array Spatial Encoding

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Physics

Background:

  • Transmit Array Spatial Encoding (TRASE) uses RF phase gradients for Fourier encoding.
  • Portable MRI systems often have B0 field inhomogeneities due to lightweight magnet design.
  • Inhomogeneous fields cause artifacts in TRASE imaging, limiting its application.

Purpose of the Study:

  • To extend TRASE capabilities for portable MRI systems with inhomogeneous B0 fields.
  • To overcome limitations of previous TRASE methods in non-ideal magnetic environments.
  • To enable Fourier encoding in portable scanners where gradient coils are constrained.

Main Methods:

  • Utilized swept radiofrequency (RF) pulses, specifically WURST pulses, for TRASE imaging.
  • Implemented a quadratic phase removal method to correct for swept pulse modulations.
  • Employed a phase alternation scheme to mitigate coherence pathway artifacts.

Main Results:

  • Successfully demonstrated TRASE imaging in a highly inhomogeneous magnetic field (ΔB0/B0∼1%).
  • WURST pulses effectively excited and refocused spins across the full bandwidth, eliminating artifacts.
  • The developed correction and alternation schemes improved image quality in challenging field conditions.

Conclusions:

  • The enhanced TRASE methodology enables effective Fourier encoding in portable MRI with inhomogeneous B0 fields.
  • This advancement is crucial for the development and deployment of accessible, non-conventional MRI systems.
  • The technique overcomes previous limitations, broadening the applicability of TRASE technology.