Figure 2
From: High-speed, high-frequency ultrasound, in utero vector-flow imaging of mouse embryos
Color-flow Doppler axial velocity map of a 1-cm diameter scattering phantom rotating with a maximum expected velocity of 3.1 cm/s at the outer edge of the phantom. The peak velocities on either side of the phantom, where the Doppler angle was 0 degrees, agreed with the expected maximum velocity. The central region of the phantom where the axial motion was zero represents a blind zone when using traditional Doppler methods.
