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Rapid multi-orientation quantitative susceptibility mapping.

Berkin Bilgic1, Luke Xie2, Russell Dibb3

  • 1Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, MA, USA; Department of Radiology, Harvard Medical School, Boston, MA, USA.

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Summary
This summary is machine-generated.

Accelerated 3D gradient echo (GRE) with Wave-CAIPI significantly reduces scan times for susceptibility mapping (SWI, QSM, STI) at high resolutions. This technique enables faster, clinically viable multi-orientation imaging for quantitative susceptibility tensor imaging (STI).

Keywords:
Parallel imagingPhase imagingQuantitative susceptibility mappingSusceptibility tensor imagingWave-CAIPI

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Area of Science:

  • Magnetic Resonance Imaging
  • Biophysics
  • Medical Physics

Background:

  • Three-dimensional gradient echo (GRE) is crucial for susceptibility weighted imaging (SWI), quantitative susceptibility mapping (QSM), and susceptibility tensor imaging (STI).
  • Long repetition times (TR) are needed for optimal signal-to-noise ratio, increasing scan duration, especially for whole-brain, high-resolution imaging.
  • Current methods like multi-orientation sampling (COSMOS) and susceptibility tensor imaging (STI) require numerous head orientations, further extending acquisition times.

Purpose of the Study:

  • To significantly accelerate susceptibility mapping acquisition at multiple head orientations.
  • To demonstrate the efficiency of 3D-GRE with Wave-CAIPI for reducing scan times in susceptibility mapping protocols.
  • To enable faster, high-resolution, multi-orientation imaging for potential clinical applications.

Main Methods:

  • Implementation of 3D gradient echo (GRE) sequence combined with Wave-CAIPI acceleration.
  • Acquisition of data at multiple head orientations using R=15-fold acceleration.
  • Evaluation of image quality and noise amplification (g-factor) at 3T and 7T.

Main Results:

  • Wave-CAIPI enabled acquisition at 1.1mm isotropic resolution in 90 seconds per orientation and 0.5mm isotropic resolution in 5:35 minutes per orientation.
  • Maximum g-factor noise amplification remained below 1.30 at 3T and 1.12 at 7T, indicating minimal noise increase.
  • A complete 30-minute exam for susceptibility tensor imaging (STI) with 12 orientations became feasible.

Conclusions:

  • Wave-CAIPI dramatically speeds up 3D GRE-based susceptibility mapping at multiple orientations.
  • This acceleration makes high-resolution, multi-orientation quantitative susceptibility tensor imaging (STI) protocols clinically practical.
  • The technique overcomes limitations of long TR and extensive encoding, paving the way for broader clinical adoption of advanced susceptibility mapping.