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Whole-brain B1 -mapping using three-dimensional DREAM.

Philipp Ehses1, Daniel Brenner1, Rüdiger Stirnberg1

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Summary
This summary is machine-generated.

This study introduces 3DREAM, a rapid 3D magnetic resonance imaging (MRI) technique for quickly mapping brain flip angles and proton density. 3DREAM enables fast, whole-brain imaging at high field strengths.

Keywords:
flip anglehigh-field MRIparallel transmission

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Area of Science:

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

Background:

  • Accurate flip angle and proton density (PD) mapping are crucial for quantitative MRI.
  • Existing methods can be time-consuming, limiting whole-brain coverage or resolution.

Purpose of the Study:

  • To demonstrate a novel 3D version of the DREAM sequence (3DREAM) for rapid 3D flip angle and proton density mapping of the human brain.
  • To evaluate the performance of 3DREAM on a 7T system.

Main Methods:

  • Employed a rectangular non-selective spin-tagging (STE) preparation followed by a 3D readout with Cartesian center-out spiral phase encoding.
  • Utilized parallel imaging acceleration in both phase encoding dimensions.
  • Implemented filtering to suppress artifacts from signal decay and adjusted echo train length and readout flip angle to control blurring.

Main Results:

  • Achieved whole-head proton density mapping at 7T with a nominal resolution of 5 mm, with and without parallel imaging acceleration.
  • Demonstrated effective suppression of artifacts caused by signal decay differences between FID and STE signals.
  • Showcased the ability to control remaining blurring through parameter adjustments.

Conclusions:

  • 3DREAM enables rapid whole-brain flip angle mapping in seconds.
  • Individual coil maps can be acquired in approximately one minute using an 8-channel array.
  • 3DREAM offers a fast and efficient solution for quantitative brain MRI.