The variation in frequency locations in Doppler ultrasound spectra for maximum blood flow velocities in narrowed vessels

The variation in the maximum blood flow velocity, which corresponds to the maximum frequency shift in the results of a Doppler ultrasound test, can reflect the blood flow conditions of vessels [1]. Accordingly, several parameters are used to diagnose cardiac and cerebrovascular diseases (atherosclerosis, stroke, etc.). These parameters include the systole and diastole (S/D) velocity ratio, resistance index (RI), and pulsatility index (PI) [2,3]. It is significant to accurately estimate the maximum blood flow velocity in vessels, especially for those with different degrees of stenosis.
Source: Medical Engineering and Physics - Category: Biomedical Engineering Authors: Source Type: research