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Variable velocity encoding in a three-dimensional, three-directional phase contrast sequence: Evaluation in phantom

Anders Nilsson1, Karin Markenroth Bloch, Marcus Carlsson

  • 1Department of Medical Radiation Physics, Lund University, Lund, Sweden. anders.nilsson@med.lu.se

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Variable velocity encoding in 4D-vPC MRI reduces noise and improves blood flow visualization. This novel technique optimizes the velocity-to-noise ratio for clearer hemodynamic imaging in cardiac applications.

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Area of Science:

  • Cardiovascular Magnetic Resonance Imaging
  • Medical Physics
  • Biomedical Engineering

Background:

  • Phase contrast magnetic resonance imaging (PC-MRI) is crucial for non-invasive blood flow quantification.
  • Optimizing velocity encoding (VENC) is essential for accurate flow measurements and reducing noise in PC-MRI.
  • Current methods often use constant VENC throughout the cardiac cycle, which may not be optimal for dynamic flow patterns.

Purpose of the Study:

  • To evaluate the accuracy and noise characteristics of a novel time-resolved, 3D, 3-directional phase contrast sequence with variable velocity encoding (4D-vPC) at 3 Tesla.
  • To investigate the benefits and limitations of variable VENC for depicting blood flow patterns.
  • To compare 4D-vPC MRI with standard 4D-PC MRI using constant VENC.

Main Methods:

  • Modification of a 4D PC-MRI sequence to enable independent, variable VENC in all three velocity directions throughout the cardiac cycle.
  • Comparison of constant and variable VENC 4D-PC sequences in a rotating phantom to assess velocity measurements and noise levels.
  • Evaluation of blood flow patterns in the ascending aorta of six healthy volunteers using both constant and variable VENC sequences.

Main Results:

  • Phantom measurements demonstrated a linear correlation between velocity noise and VENC, confirming theoretical predictions.
  • 4D-vPC MRI consistently showed lower noise levels compared to standard 4D-PC MRI in both phantom and volunteer studies.
  • Volunteer data revealed more consistent and detailed blood flow patterns, particularly in early diastole, with the variable VENC sequences.

Conclusions:

  • Variable velocity encoding significantly reduces noise levels in 4D PC-MRI compared to constant VENC by optimizing the velocity-to-noise ratio (VNR).
  • The enhanced VNR achieved with variable VENC can lead to improved visualization of complex blood flow dynamics.
  • This technique holds potential benefits for the accurate assessment of cardiovascular pathologies by providing clearer hemodynamic imaging throughout the cardiac cycle.