The characteristics of the blood flow distribution near the vessel wall in mildly-stenosed vessels

This paper presents a study on the velocity distribution of the blood flow near the vessel wall in the mildly-stenosed vessels to determine the characteristics being sensitive to the arterial stenosis at an early stage. By solving the Navier-Stokes equations, the velocity distributions of blood flow near the vessel wall in the mildly stenosed vessels are calculated according to the velocity at the axis of the circular tube, and then the power spectrum density (PSD) of the blood flow velocity distribution is estimated by summing the contribution of all scatterers passing through the sample volume grouped into elemental volumes to determine the characteristics being sensitive to the mild stenosis. The results show that Doppler ultrasound spectrogram characteristics, such as: increased spectral broadening index and obvious reserved blood flow (components with negative frequencies), are observed in the blood flow close to the vessel wall, and could be used as the indications that identify the mild narrowing of arteries.