Ultrasound cannot check whether the fallopian tubes are open or not. The shape of the fallopian tubes is influenced by the surrounding tissues and has a certain curvature, and the tubes themselves are relatively thin, especially the inner diameter, which is only 1mm in some places, so ultrasound cannot show it. To check whether the fallopian tubes are open or not, an imaging test is needed to inject contrast into the fallopian tubes. B ultrasound can only check whether the fallopian tubes are thickened, whether there is fluid in the fallopian tubes and whether there is a mass in the fallopian tube area, etc. B ultrasound cannot show whether the fallopian tubes are open.