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3D Scanning Technology Bridging Microcircuits and Macroscale Brain Images in 3D Novel Embedding Overlapping Protocol
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Three-Dimensional GRE T1ρ mapping of the brain using tailored variable flip-angle scheduling.

Casey P Johnson1,2, Daniel R Thedens3, Stanley J Kruger3

  • 1Veterinary Clinical Sciences Department, University of Minnesota, Saint Paul, MN, USA.

Magnetic Resonance in Medicine
|February 14, 2020
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Summary

A new method called tailored variable flip-angle (VFA) scheduling improves 3D T1ρ brain mapping by significantly increasing signal-to-noise ratio (SNR) efficiency. This technique offers greater flexibility and accuracy compared to existing methods.

Keywords:
SNRT1rhoaccuracybrainquantitative MRItailored VFA scheduling

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Area of Science:

  • Magnetic Resonance Imaging
  • Neuroimaging
  • Quantitative MRI

Background:

  • Quantitative T1ρ mapping is crucial for brain tissue characterization.
  • Existing methods like MAPSS face limitations in SNR efficiency and parameter flexibility.
  • Optimizing 3D T1ρ mapping is essential for advanced neuroimaging applications.

Purpose of the Study:

  • To introduce and evaluate a novel tailored variable flip-angle (VFA) scheduling technique for SNR-efficient 3D T1ρ brain mapping.
  • To compare the performance of tailored VFA scheduling against the state-of-the-art MAPSS technique.
  • To determine optimal imaging parameters for the proposed VFA scheduling method.

Main Methods:

  • Simulations were conducted to assess SNR efficiency, quantitative accuracy, and spatial blurring of tailored VFA scheduling versus MAPSS.
  • Optimal imaging parameters were calculated for both techniques, with and without CSF nulling.
  • In vivo 3T MRI scans were performed on four participants to validate the approach using MAPSS as a reference.

Main Results:

  • Tailored VFA scheduling demonstrated a 2-fold to 4-fold SNR gain in T1ρ maps compared to MAPSS.
  • Quantitative T1ρ errors were limited to 2% or less with the new technique.
  • In vivo whole-brain 3D T1ρ maps showed superior SNR efficiency, which improved with increased views per segment.

Conclusions:

  • Tailored VFA scheduling is an effective and SNR-efficient technique for 3D T1ρ brain mapping using gradient-echo sequences.
  • This novel approach offers enhanced flexibility in parameter selection compared to MAPSS.
  • The improved efficiency and flexibility of tailored VFA scheduling hold promise for various neuroimaging applications.