Peng Yao
ABSTRACT
The blood flow velocity profile (BFVP) is associated with atherosclerosis, and the Doppler Ultrasound has wide application in the BFVP estimation. However, the Doppler Ultrasound with autocorrelation technique chooses a fixed and high pulse repetition frequency(PRF) to estimate the BFVP in order to prevent frequency aliasing, which leads to incomplete fluctuation cycle of the Doppler signal for slow blood flow close to the wall due to insufficient acquisition time. This paper proposes the adaptive PRF to estimate the BFVP and improve the accuracy, especially for slow blood flow near the wall. To evaluate the performance of the adaptive PRF, in-vitro experiments were carried out. In-vitro experiments, the normalized root mean square errors (NRMSEs) between the estimated and theoretical BFVPs are calculated. The adaptive PRF provided mean errors 31.4% and 38.7% smaller and standard deviations 41.6% and 49.2% smaller than the fixed PRF in the two periods of a pulsing cycle, respectively. Therefore, the proposed method can effectively improve the BFVP estimation, which is expected to provide more accurate diagnostic information for cardiovascular diseases.
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- The estimation of blood flow velocity profile with the Doppler Ultrasound based on adaptive pulse repetition frequency
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