A vaginal ultrasound probe is better than nothing.
Picton
P
P
Brownlow
H
H
D002343:Carotid Artery, Internal / Q000000981:diagnostic imaging; D002405:Catheterization, Central Venous / Q000379:methods*; D005260:Female; D006801:Humans; D007601:Jugular Veins / Q000000981:diagnostic imaging*; D014463:Ultrasonography / Q000295:instrumentation; D014621:Vagina