Key result
The instantaneous power of the Doppler signal allows for the estimation of changes in blood flow diameter during the cardiac cycle, improving the accuracy of blood flow rate and diagnostic indices.
New analytical expressions for Doppler signal power may improve the accuracy of blood flow rate measurements and diagnostic indices in ultrasound systems.
May refine Doppler flow quantification; leaves open prospective clinical validation before practice change.
By means of determining the dependence of blood flow rate and different indices on the spectral characteristics of the ultrasonic Doppler response of blood flow the issue of improving the measurement efficiency of vascular system diagnostic parameters is studied. It is shown that instantaneous power of the Doppler signal allows to draw the conclusion about varying of blood flow diameter during the cardiocycle. On the basis of the analytical expressions for the instantaneous power of the Doppler signal, which consider the focusing of waves at an arbitrary ratio between duration of the probing pulses and blood vessel diameter, the expressions for Stuart, Gosling and Pourcelot indices as well as blood flow rate are derived. These expressions allow to set the degree of the diagnostic value of the proposed new indices of blood flow and improve the method of determining blood flow rate in ultrasound Doppler systems. References 17, figures 5
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Barannik et al. (2014) studied this question. Analytical expressions for instantaneous power of Doppler signals was evaluated on Accuracy of quantitative blood flow parameters (theoretical derivation). The instantaneous power of the Doppler signal allows for the estimation of changes in blood flow diameter during the cardiac cycle, improving the accuracy of blood flow rate and diagnostic indices.
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