For millions of years, bats and porpoises have been using ultrasonic echoes to locate their prey. Now physicians and surgeons are learning to use the same technique to hunt for different targets. With pulses of "sound" far too high for human hearing, they are locating tumors that must be cut out, livers that must be treated for cirrhosis, babies' heads that are too big to pass through the mother's pelvic arch, even fast-beating heart-valve leaflets that need to be repaired.
For Pregnant Women. One of the leading U.S. ultrasound diagnosticians, Dr. Joseph...
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