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Related Experiment Videos

MR flow quantification with cardiovascular applications: a short overview

F Ståhlberg1, L Söndergaard, C Thomsen

  • 1Department of Diagnostic Radiology, Lund University Hospital, Sweden.

Acta Paediatrica (Oslo, Norway : 1992). Supplement
|August 1, 1995
PubMed
Summary
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Magnetic resonance imaging (MRI) quantifies cardiovascular flow using flow-sensitizing gradients. This velocity mapping technique measures blood flow and pressure gradients, offering a promising tool for evaluating heart conditions.

Area of Science:

  • Cardiovascular imaging
  • Medical physics

Background:

  • Magnetic resonance imaging (MRI) is crucial for cardiovascular assessment.
  • Quantifying blood flow is essential for diagnosing and managing cardiovascular diseases.
  • Current methods for flow quantification have limitations.

Purpose of the Study:

  • To provide an overview of MRI's potential for cardiovascular flow quantification.
  • To explain the principles of phase-sensitive flow MRI (velocity mapping).
  • To highlight the clinical applications and future prospects of this technique.

Main Methods:

  • Utilizing flow-sensitizing magnetic field gradients to induce velocity-dependent phase shifts.
  • Employing a phase-sensitive, two-dimensional gradient-echo technique with flow encoding.

Related Experiment Videos

  • Calculating linear velocity, vessel area, and flow rate from velocity maps.

    • Main Results:

    • A linear relationship exists between constant velocity and phase angle, confirmed theoretically and experimentally.
    • Velocity mapping allows for the determination of linear velocity, vessel area, and flow rate.
    • Trans-stenotic pressure gradients can be estimated in stenotic vessels.

    Conclusions:

    • Phase-sensitive flow MRI (velocity mapping) is a versatile technique for cardiovascular flow quantification.
    • The method has demonstrated utility in adult cardiac studies (coronary flow, aortic valve disease) and pediatric congenital heart disease.
    • Flow investigation with MRI holds significant potential as a future clinical tool for cardiovascular disorders.