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Related Experiment Videos

Multigated blood-pool imaging using heart sounds.

M W Groch1, J R Domnanovich, W D Erwin

  • 1Rush Graduate College, Department of Medical Physics Rush Presbyterian-St Luke's Medical Center, Chicago, Illinois 60612.

Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
|August 1, 1991
PubMed
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A novel heart sound gating (HSG) method accurately triggers multigated blood-pool imaging using first (S1) and second (S2) heart sounds. This technique offers a reliable alternative to ECG gating for assessing left ventricular function, especially in challenging patient cases.

Area of Science:

  • Cardiovascular Imaging
  • Biomedical Engineering
  • Nuclear Cardiology

Background:

  • Multigated blood-pool (MGBP) imaging traditionally relies on electrocardiogram (ECG) gating for cardiac cycle synchronization.
  • Limitations of ECG gating include signal interference and inaccuracies, particularly in patients with arrhythmias or rapidly changing heart rates.

Purpose of the Study:

  • To develop and evaluate a novel heart sound gating (HSG) method for MGBP acquisition.
  • To assess the feasibility of using first (S1) and second (S2) heart sounds as trigger points for MGBP.
  • To compare the accuracy of HSG-MGBP with conventional ECG-gated MGBP in evaluating left ventricular function.

Main Methods:

  • Development of specialized HSG circuitry to identify S1 and S2 sounds based on their timing.

Related Experiment Videos

  • Application of HSG to trigger MGBP acquisition in twenty patients undergoing left ventricular function analysis.
  • Comparison of left ventricular ejection fractions (LVEFs) calculated from HSG-MGBP and ECG-gated MGBP.

    • Main Results:

    • HSG circuitry successfully identified individual S1 and S2 heart sounds, providing two distinct trigger points per cardiac cycle.
    • LVEFs calculated using S1 and S2 heart sound triggers correlated well with those from conventional ECG-gated acquisitions.
    • HSG demonstrated potential utility in patients with rapid heart rate variations and inadequate ECG signals.

    Conclusions:

    • Heart sound gating (HSG) provides a viable alternative trigger mechanism for MGBP imaging.
    • HSG accurately defines end-systole (S1) and end-diastole (S2), enabling precise assessment of systolic ejection and diastolic filling.
    • This method enhances MGBP applicability in complex clinical scenarios where ECG gating is suboptimal.