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Power Doppler Dual‐Frame Triggering of Myocardial Contrast Echocardiography: A Quantitative Video Intensity Analysis
Author(s) -
Kolias Theodore J.,
Avelar Erick,
Bradsher Kristi,
Cermak Lisa,
Armstrong William F.,
Vannan Mani A.
Publication year - 2001
Publication title -
echocardiography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 62
eISSN - 1540-8175
pISSN - 0742-2822
DOI - 10.1046/j.1540-8175.2001.00497.x
Subject(s) - intensity (physics) , myocardial infarction , perfusion , medicine , frame rate , doppler effect , contrast (vision) , cardiology , radiology , nuclear medicine , computer science , computer vision , physics , optics , astronomy
Aim: The purpose of this study was to define the pattern of myocardial contrast observed during triggered dual‐frame power Doppler imaging. Methods and Results: Ten patients with no previous history of myocardial infarction underwent a continuous intravenous infusion of Optison at 0.5 ml/min. Triggered, sequential dual‐frame power Doppler imaging was performed from an apical four‐chamber view using a prototype Acuson Sequoia imaging system. The average triggering interval was once every four cardiac cycles, and the average interval between sequential frames was 50 msec. Video intensity analysis was performed in five myocardial regions of interest, and the percent decrease in video intensity of the destruction frames in each region of interest was determined by subtracting the destruction frame video intensity from the fill frame video intensity. The percent decrease in video intensity varied significantly by myocardial location ( P < 0.001 ), with greater destruction seen in the apical than in the basal regions. Conclusion: This preliminary study demonstrates that power Doppler dual‐frame triggering produces nonuniform decreases in video intensity, which likely represent nonuniform microbubble destruction. These results have important implications for the interpretation of myocardial perfusion patterns using this technique.