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Related Experiment Videos

Flow-gated phase-contrast MRI using radial acquisitions.

Richard B Thompson1, Elliot R McVeigh

  • 1Laboratory of Cardiac Energetics, National Institutes of Health, Bethesda, MD 20892-1061, USA. thompsor@nhlbi.nih.gov

Magnetic Resonance in Medicine
|August 31, 2004
PubMed
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This study shows that magnetic resonance imaging (MRI) flow data can be used for cardiac gating. This method provides an alternative to electrocardiography (ECG) gating, especially in challenging fetal or contaminated MRI environments.

Area of Science:

  • Medical Imaging
  • Cardiovascular Imaging
  • Biomedical Engineering

Background:

  • Phase-contrast (PC) MRI noninvasively images blood and tissue velocity.
  • PC MRI requires cardiac gating for data acquisition across multiple heartbeats.
  • Conventional ECG gating is unsuitable for fetal imaging or ECG signal contamination.

Purpose of the Study:

  • To demonstrate the feasibility of using MRI flow data for cardiac gating.
  • To develop an alternative gating method for PC MRI.
  • To enable accurate cardiac gating in challenging imaging scenarios.

Main Methods:

  • Utilized an undersampled radial k-space acquisition method.
  • Derived a real-time, image-based flow-gating waveform.
  • Reconstructed gated-segmented images by combining data from multiple heartbeats.

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Main Results:

  • Successfully derived cardiac gating times from flow-encoded MRI data.
  • Achieved a standard deviation of 5 ms to 12 ms between flow-gating and ECG gating times.
  • Demonstrated feasibility across multiple anatomical regions in normal volunteers.

Conclusions:

  • Image-derived flow gating is a feasible alternative to ECG gating for PC MRI.
  • This method enhances cardiac MRI applications where ECG gating is not possible.
  • Offers improved data acquisition for cardiovascular and fetal imaging.