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Related Experiment Videos

MR angiography with pulsatile flow.

R G de Graaf1, J P Groen

  • 1Philips Medical Systems, Best, The Netherlands.

Magnetic Resonance Imaging
|January 1, 1992
PubMed
Summary

Optimizing magnetic resonance angiography (MRA) involves understanding pulsatile blood flow. This study introduces a new 2D inflow MRA method combining partial cardiac cycle data acquisition and cardiac-ordered phase encoding for improved image quality.

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Area of Science:

  • Medical Imaging
  • Cardiovascular Imaging
  • Magnetic Resonance Imaging

Background:

  • Current 3D MR angiography (MRA) methods often forgo ECG-synchronization for speed, potentially impacting image quality due to pulsatile blood flow.
  • Understanding the effects of time-dependent blood flow on MRA signal intensity is crucial for optimizing imaging techniques.

Purpose of the Study:

  • To investigate the consequences of pulsatile arterial blood flow on the 2D inflow magnetic resonance angiography (MRA) method.
  • To develop and evaluate novel MRA data acquisition strategies to enhance image quality without significantly increasing scan times.

Main Methods:

  • Utilized a 2D phase-based method with retrospective cardiac synchronization to analyze arterial blood flow and signal intensity across cardiac phases.
  • Simulated alternative MRA acquisition strategies, including partial cardiac cycle data collection and cardiac-ordered phase encoding, using multiphase study raw data.
  • Implemented the optimized strategy on Philips Gyroscan systems for comparison with standard non-triggered 2D inflow MRA.

Main Results:

  • Demonstrated a clear correlation between blood signal intensity enhancement and time-dependent pulsatile flow.
  • Simulation results indicated that combining partial cardiac cycle data acquisition and cardiac-ordered phase encoding yielded the best outcomes.
  • Practical MRA studies showed significantly improved MR angiograms for highly pulsatile flow using the new method compared to standard non-triggered 2D inflow.

Conclusions:

  • A novel 2D inflow MRA technique combining partial data acquisition and cardiac-ordered phase encoding effectively improves MR angiogram quality in the presence of pulsatile blood flow.
  • This optimized approach offers a viable solution for achieving high-quality MRA without the prolonged scan times associated with standard cardiac triggering.

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