Figure 4.

PCI overlaid (hot colormap) on a B-mode (grayscale) for the spectral Doppler “sample volume” placed at an upstream location [(A) and (C)] and a location 5 mm downstream [(B) and (D)]. The PCI was beamformed over the inharmonic frequency band (2.85–3.15 MHz) using $A_{\text{Cos}}$ [(A) and (B)] and $A_{\text{NormCos}}$ [(C) and (D)]. ELIP were insonified with an MI of 0.8 and pulse duration of 1.33 μs.