Comparison of methods of recording and analysis of Doppler blood velocity signals in normal subjects |
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Authors: | SP Creekmore MM Graham GE Jahn RC Targett MB McIlroy |
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Institution: | Cardiovascular Research Institute and Department of Medicine, University of California San Francisco, San Francisco, CA 94143, U.S.A. |
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Abstract: | Doppler blood velocity signals were recorded from the aorta and pulmonary artery in normal adults, children and premature infants, using three different pulsed, range-gated instruments. The tracings analyzed by three independent methods of spectral analysis with axially aimed transducers showed velocity patterns with a narrow range of frequencies (blunt velocity profile) with a constant acceleration of blood flow in early systole. A similar velocity pattern was seen in the premature infant's aorta in which the transducer beam was larger than the vessel insonated. We conclude that the normal velocity pattern in the central circulation is close to blunt, and that tracings obtained with transducers that insonate varying proportions of the vessel give similar signals. |
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Keywords: | Pulsed Doppler Spectral analysis Fixed filter spectral analyzer Fast Fourier transform Microcomputer Aorta Pulmonary artery Normal subjects Children Premature infants Ultrasound |
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