Figure 6
From: High-speed, high-frequency ultrasound, in utero vector-flow imaging of mouse embryos
Three frames (76, 119 and 212 ms relative to start of spectrogram) from the vector-flow analysis of the data sequence of Fig. 5. The Doppler spectrogram represents the same region of the umbilical cord (UC) as was indicated in Fig. 5a. The yellow line in the spectrogram indicates the slow-time point for which the data is displayed. (a) Early systole with steady flow in umbilical vein. (b) Late diastole to early systole where flow in heart is minimal. (c) Flow in heart increasing during diastole. The white arrows highlight the general direction of local flow vectors in each frame. Flow vectors point in the direction of flow and their color and length scale with the vector magnitude. UA: Umbilical artery, UV: Umbilical vein. The full image sequence is available as Movie 4.
