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Related Experiment Videos

Optimizing the method to calculate right ventricular ejection fraction from first-pass data acquired with a

L L Johnson1, M A Lawson, G G Blackwell

  • 1University of Alabama at Birmingham, USA.

Journal of Nuclear Cardiology : Official Publication of the American Society of Nuclear Cardiology
|September 1, 1995
PubMed
Summary

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This study found that two radionuclide methods, the first-pass 2-region of interest (ROI) and RA-subtracted single ROI, accurately measure right ventricular ejection fraction (RVEF). Other methods like single ROI and gated blood pool scans (GBPS) were less accurate.

Area of Science:

  • Nuclear Cardiology
  • Cardiovascular Imaging
  • Medical Physics

Background:

  • Radionuclide angiography offers geometry-independent measurement of right ventricular ejection fraction (RVEF).
  • Right atrial (RA) overlap is a key limitation, affecting time activity curve (TAC) accuracy.
  • Multicrystal cameras improve temporal separation and count statistics for first-pass studies, theoretically enhancing RVEF accuracy.

Purpose of the Study:

  • To develop and validate an accurate method for measuring RVEF using multicrystal first-pass data.
  • To compare the accuracy of different radionuclide angiography techniques against cine-magnetic resonance imaging (cine-MRI).

Main Methods:

  • Twenty-five patients underwent sequential cine-MRI, first-pass radionuclide angiography, and gated equilibrium imaging.

Related Experiment Videos

  • Three first-pass RVEF calculation methods were evaluated: single ROI, dual ROI, and RA-subtracted single ROI.
  • Cine-MRI, using Simpson's rule on serial short axis views, served as the gold standard for ventricular volume measurement.

    • Main Results:

    • Cine-MRI demonstrated accurate RVEF measurements, with values ranging from 34% to 59%.
    • The dual ROI and RA-subtracted single ROI first-pass methods showed strong correlation with cine-MRI (not significantly different from the line of identity).
    • The single ROI first-pass method and gated blood pool scans (GBPS) underestimated RVEF compared to cine-MRI.

    Conclusions:

    • Cine-MRI is a reliable tool for validating radionuclide-based RVEF measurement algorithms.
    • The first-pass dual ROI and RA-subtracted single ROI methods are the most accurate radionuclide techniques for RVEF assessment.
    • Gated blood pool scans (GBPS) provide less accurate RVEF measurements compared to validated first-pass methods.