Figure 1: Normal placenta depicted using superb microvascular imaging
Villous blood vessels (villous trees) are depicted from the fetal surface (bottom) to the terminal villi (top). Large arrow, stem villi; small arrow, terminal villi. Slow blood flow in the intervillous space from the spiral artery is also visualized like as ”scatter,” which matches the heart rate of the mother as the background of villous tree (triangle).