3. Conventional techniques in PWV assessment
Waveform-based techniques applied flow velocity, pressure or diameter waves for PWV assessment [73]. Techniques utilized either two-site (Figure 2.) or one-site method for PWV estimation [44]. The former method includes evaluation of flow velocity at two distinct sites separated by a measurable distance and the latter applied either Moens-Korteweg (Eq. 1) [74–77] or Bramwell-Hill equation (Eq. 2) [78].