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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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In vitro Assessment of Aortic Regurgitation Using Four-Dimensional Flow Magnetic Resonance Imaging
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Accelerated aortic 4D flow MRI with wave-CAIPI.

Julian A J Richter1,2,3, Tobias Wech1, Andreas M Weng1

  • 1Department of Diagnostic and Interventional Radiology, University Hospital Würzburg, Würzburg, Germany.

Magnetic Resonance in Medicine
|November 24, 2020
PubMed
Summary
This summary is machine-generated.

Wave-CAIPI (controlled aliasing in parallel imaging) significantly improves 4D flow MRI by reducing flow parameter deviations and acquisition time. This advanced technique enhances precision and image quality for better hemodynamic analysis.

Keywords:
4D flowaortaphase contrastwave-CAIPI

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Cardiovascular Imaging
  • Biomedical Engineering

Background:

  • 4D flow MRI is crucial for cardiovascular assessment.
  • Accelerated imaging techniques are needed to reduce scan times.
  • Wave-CAIPI offers potential for faster, high-quality MRI.

Purpose of the Study:

  • To evaluate the acceleration potential of wave-CAIPI for 4D flow MRI.
  • To assess if wave-CAIPI maintains image quality and flow parameter precision.
  • To compare wave-CAIPI with standard 2D-CAIPI in accelerated settings.

Main Methods:

  • 10 healthy volunteers and 1 patient with aortic valve stenosis underwent 4D flow MRI.
  • Acquisitions used wave-CAIPI and standard 2D-CAIPI (R=2) with retrospective undersampling (R=6).
  • Flow rate, net flow, peak velocity, and average velocity were calculated in the aorta.

Main Results:

  • Wave-CAIPI showed smaller deviations in flow parameters compared to 2D-CAIPI.
  • Mean absolute differences for flow rate and net flow were significantly lower with wave-CAIPI.
  • Wave-CAIPI exhibited lower noise levels and reduced qualitative discrepancies in hemodynamic patterns.

Conclusions:

  • Wave-CAIPI enhances flow parameter precision in retrospectively accelerated 4D flow MRI.
  • Acquisition time can be reduced by a factor of 3 with minimal impact on flow parameters.
  • Wave-CAIPI is a promising technique for accelerated 4D flow MRI with improved accuracy.