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Related Experiment Videos

Improved endocardial visualization with second harmonic imaging compared with fundamental two-dimensional

R Senior1, P Soman, R S Khattar

  • 1Northwick Park Hospital and Institute for Medical Research, Harrow, United Kingdom.

American Heart Journal
|July 1, 1999
PubMed
Summary

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Second harmonic imaging significantly improves endocardial visualization compared to fundamental imaging in patients with suboptimal views. This advanced technique enhances the clarity of heart structures, aiding diagnosis.

Area of Science:

  • Cardiovascular Imaging
  • Medical Ultrasound Technology
  • Echocardiography

Background:

  • Fundamental echocardiography provides suboptimal endocardial visualization in at least 30% of patients.
  • Second harmonic imaging was initially developed for myocardial contrast agent visualization.
  • A hypothesis was formed that harmonic imaging could enhance endocardial visualization over fundamental imaging.

Purpose of the Study:

  • To compare the efficacy of second harmonic imaging versus fundamental imaging for endocardial visualization.
  • To assess if harmonic imaging improves visualization in patients with previously suboptimal echocardiographic views.

Main Methods:

  • 40 patients with poor endocardial visualization underwent both fundamental and harmonic imaging without contrast.

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  • Images were analyzed by two independent observers using a standardized scoring system (0=not visualized, 1=poorly visible, 2=well visualized).
  • Endocardial visualization indexes and inter/intraobserver agreement for wall thickening were calculated.

    • Main Results:

    • Harmonic imaging demonstrated significantly more segments with a "well visualized" score (score 2) compared to fundamental imaging (P <.001).
    • Fundamental imaging resulted in more segments scored as "not visualized" (score 0) or "poorly visible" (score 1) (P <.001).
    • Improved visualization indexes and inter/intraobserver agreement for wall thickening were observed with harmonic imaging across all views.

    Conclusions:

    • Second harmonic imaging is superior to fundamental imaging for endocardial visualization.
    • This improvement is particularly notable in patients experiencing suboptimal visualization with conventional methods.