Wait...WHAT?
— Pradheep J. Shanker, M.D. (@neoavatara) September 5, 2021
This is false @npr.
Most we use M-mode ultrasound for fetal heart tones...this mode measures MOTION, not electrical activity. In fact, ultrasound doesn't measure electricity at all.
It is literally detecting motion. https://t.co/ImRJ0Cl3Gn https://t.co/RK0SMJs4AM