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A validation of a flow quantification by MR phase mapping software

E Laffon1, N Valli, V Latrabe

  • 1Service de Médecine Nucléaire, Groupe Hospitalier Sud, Hôpital du Haut-lévêque, Pessac, France.

European Journal of Radiology
|June 25, 1998
PubMed
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Siemens flow quantification (FQ) software slightly underestimates velocities but shows low variability in ascending aorta assessments. Accuracy depends on reference area selection and avoiding multiple cardiac cycle recordings for reliable results.

Area of Science:

  • Cardiovascular imaging
  • Medical physics

Background:

  • Magnetic Resonance Imaging (MRI) is crucial for non-invasive cardiovascular assessment.
  • Accurate flow quantification (FQ) is essential for diagnosing and monitoring various cardiovascular conditions.

Purpose of the Study:

  • To evaluate the practical utility and accuracy of a Siemens MRI software for flow quantification using phase mapping.
  • To assess the performance of the software in both phantom and in vivo settings, specifically in the ascending aorta.

Main Methods:

  • Experiments were conducted using a laminar flow phantom to assess velocity under controlled conditions.
  • In vivo studies involved measuring pulsatile flow in the ascending aorta of healthy volunteers.

Main Results:

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  • Flow phantom experiments indicated a slight underestimation of mean velocities by approximately 8%.
  • Velocity uncertainties were found to correlate with the encoding velocity setting, irrespective of the measured velocity.
  • In vivo assessments in the ascending aorta demonstrated low intraobserver and negligible interobserver variability when using defined working criteria.

    • Conclusions:

    • The choice of reference area significantly impacts FQ accuracy.
    • Acquiring multiple cardiac cycles within a single scan can lead to erroneous results.
    • Recommendations for optimal use of the Siemens FQ software in the ascending aorta are provided.