منابع مشابه
Quantification of mitral regurgitation by integrated Doppler backscatter power.
OBJECTIVES We attempted to determine whether continuous wave Doppler backscatter power could be used to quantify mitral regurgitation. BACKGROUND The power of a Doppler backscatter signal is proportional to the number of scatterers insonated and, hence, to the moving volume of blood. The relative power of the continuous wave Doppler signals from mitral inflow and aortic outflow is therefore p...
متن کاملIntegrated Backscatter Intravascular Ultrasound
About 30 years ago, a pathological study by Horie et al. demonstrated that plaque rupture into the lumen of a coronary artery may precede and cause thrombus formation leading to acute myocardial infarction (Horie et al., 1978). In an angioscopic study, Mizuno et al. demonstrated that disruption or erosion of vulnerable plaques and subsequent thromboses are the most frequent cause of acute coron...
متن کاملBackscatter Estimation Using Broadband Acoustic Doppler Current Profilers
Growing interest has developed in acoustic studies about the abundance and distributional patterns of the suspended matter, such as plankton and sediments, that act as sound scatterers for Broadband Acoustic Doppler Current Profiler measurements. Supported by careful calibration procedures, acoustic studies using vertical profiles of echo intensity from moored or vessel-mounted Broadband ADCPs ...
متن کاملThe dependence of myocardial ultrasonic integrated backscatter on contractile performance.
We have recently shown that the cardiac cycle-dependent variation in myocardial ultrasonic integrated backscatter is blunted with regional ischemia in dogs. To determine if global and intramural regional myocardial contractile performance can be quantified by integrated backscatter, we analyzed ultrasonic responses after induction of increased and decreased contractility in five dogs. A recentl...
متن کاملA relationship between ultrasonic integrated backscatter and myocardial contractile function.
We have shown previously that the physiologic, mechanical cardiac cycle is associated with a parallel, cardiac cycle-dependent variation of integrated backscatter (IB). However, the mechanisms responsible are not known. The mathematical and physiological considerations explored in the present study suggest that the relationship between backscatter and myocardial contractile function reflects cy...
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ژورنال
عنوان ژورنال: Journal of the American College of Cardiology
سال: 1995
ISSN: 0735-1097
DOI: 10.1016/0735-1097(95)94368-t