Figure 9From: The use of ultrasound to identify milk ejection in women – tips and pitfallsPlot of duct diameter measured using ultrasound imaging during a 15-minute expression session using an electric breast pump. Duct diameter increased rapidly at 2 minutes and 50 seconds and 9 minutes 15 seconds. Both duct dilations (milk ejections) lasted approximately 180 seconds before duct diameter returned to the initial diameter.Back to article page