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Related Experiment Videos

Cardiovascular flow measurement with phase-contrast MR imaging: basic facts and implementation.

Joachim Lotz1, Christian Meier, Andreas Leppert

  • 1Department of Diagnostic Radiology, Medical School Hannover, Carl-Neuberg-Strasse 1, D-30625 Hannover, Germany. lotz.joachim@mh-hannover.de

Radiographics : a Review Publication of the Radiological Society of North America, Inc
|May 15, 2002
PubMed
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Phase-contrast magnetic resonance (MR) imaging offers valuable quantitative blood flow data, crucial for cardiovascular MR imaging. Careful technique selection and error mitigation can reduce overall flow measurement error to under 10% for clinical use.

Area of Science:

  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Phase-contrast magnetic resonance (MR) imaging is an established yet underutilized technique for quantitative blood flow assessment.
  • Its applications in cardiovascular MR imaging are growing, offering insights into hemodynamics.

Purpose of the Study:

  • To highlight the capabilities of phase-contrast MR imaging for quantitative blood flow analysis.
  • To discuss common errors and strategies for optimizing accuracy in flow measurements.

Main Methods:

  • Phase-contrast MR imaging sequences can be acquired during breath-holds or normal respiration using prospective or retrospective gating.
  • Precise measurements require the imaging plane to be perpendicular to the vessel with through-plane flow encoding.
  • Optimizing accuracy involves repeating sequences with appropriate encoding velocities and minimizing acquisition and analysis errors.

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Main Results:

  • Common errors include mismatched velocity encoding, imaging plane deviation, and insufficient temporal/spatial resolution.
  • Optimized techniques, including perpendicular imaging planes and appropriate velocity encoding, are essential for accurate flow quantification.
  • With careful application, the overall error in phase-contrast flow measurement can be reduced to less than 10%.

Conclusions:

  • Phase-contrast MR imaging is a powerful tool for quantitative cardiovascular blood flow assessment.
  • Adherence to best practices and error reduction strategies ensures reliable data for routine clinical application.