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Related Experiment Videos

Ejection fraction by count rate from gated images.

M V Green, W R Brody, M A Douglas

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |August 1, 1978
    PubMed
    Summary
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    This study presents a new method for measuring left-ventricular (LV) ejection fraction (EF) using ECG-gated cardiac images. The technique shows high accuracy and agreement, making it suitable for assessing heart disease.

    Area of Science:

    • Cardiology
    • Medical Imaging
    • Biomedical Engineering

    Background:

    • Left-ventricular ejection fraction (LV EF) is a critical indicator of cardiac systolic function.
    • Accurate and reliable measurement of LV EF is essential for diagnosing and managing heart disease.
    • Existing methods for LV EF assessment may have limitations in accuracy or accessibility.

    Purpose of the Study:

    • To develop and validate a novel method for determining left-ventricular ejection fraction (LV EF) using ECG-gated cardiac blood pool images.
    • To assess the accuracy and reproducibility of this new LV EF measurement technique.
    • To evaluate the suitability of the technique for clinical application in patients with heart disease.

    Main Methods:

    • LV EF was calculated by analyzing the relative change in net left-ventricular (LV) counts during systole in ECG-gated cardiac blood pool images.

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  • Interobserver agreement was assessed by three independent observers reviewing 20 studies.
  • Comparison with contrast ventriculography was performed in 39 patients.

    • Main Results:

    • The developed method demonstrated satisfactory interobserver agreement with an average correlation coefficient (r) of 0.95 across 20 studies.
    • The LV EF measurements obtained by this technique showed favorable agreement with contrast ventriculography, yielding an r value of 0.92 in 39 patients.
    • The results indicate high reproducibility and accuracy of the novel LV EF assessment method.

    Conclusions:

    • The novel ECG-gated imaging technique provides a reliable and accurate method for determining left-ventricular ejection fraction (LV EF).
    • The technique exhibits excellent interobserver agreement and compares favorably with contrast ventriculography.
    • This method is suitable for evaluating systolic function in patients diagnosed with various forms of heart disease.