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Human Fetal Blood Flow Quantification with Magnetic Resonance Imaging and Motion Compensation
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Optimal control flow encoding for time-efficient magnetic resonance velocimetry.

Mehrdad Alinaghian Jouzdani1, Mazin Jouda1, Jan G Korvink1

  • 1Institute of Microstructure Technology, Karlsruhe Institute of Technology (KIT), Eggenstein-Leopoldshafen 76344, Germany.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 19, 2023
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Summary
This summary is machine-generated.

This study introduces FAUCET, a novel magnetic resonance imaging method that encodes fluid velocity during radiofrequency excitation, enabling shorter echo times and improved signal quality for enhanced flow analysis.

Keywords:
Echo timeEncoding velocity into phaseMagnetic resonance velocimetryOptimal control theorySignal-to-noise ratio

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Fluid Dynamics
  • Biomedical Engineering

Background:

  • Phase contrast velocimetry uses bipolar gradients for fluid motion analysis.
  • Conventional methods suffer from extended echo times due to post-excitation encoding, leading to signal loss and dephasing.

Purpose of the Study:

  • To introduce a new magnetic resonance imaging (MRI) approach using optimal control theory.
  • To overcome limitations of conventional phase contrast velocimetry, specifically extended echo times.

Main Methods:

  • Developed a novel excitation pulse, FAUCET (flow analysis under controlled encoding transients).
  • FAUCET encodes velocity into phase during radiofrequency excitation, eliminating post-excitation flow encoding.
  • Utilized optimal control theory for pulse design.

Main Results:

  • FAUCET achieves significantly shorter echo times compared to conventional methods.
  • Reduced signal loss from spin-spin relaxation and B0 inhomogeneity.
  • Established a non-linear bijective phase-velocity relationship for enhanced resolution in specific velocity ranges.
  • Demonstrated superior robustness against higher-order motion terms (acceleration, jerk, snap) in computational comparisons.

Conclusions:

  • FAUCET offers a more efficient and robust method for magnetic resonance fluid velocimetry.
  • The shorter echo time and enhanced resolution capabilities are significant advancements for flow imaging.
  • This technique holds promise for improved analysis of complex fluid dynamics in biological systems.