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Ultrasound Affects Fetal Brain in Mice

Impact on Humans Unknown; Mouse Effect Seen After 30-Minute Exposures

Findings Need Confirmation continued...

But he agrees pregnant women should avoid having ultrasounds that aren't medically indicated.

Entertainment ultrasounds could turn out to be this generation's equivalent of X-raying feet to determine shoe size, Rakic says. That practice was common in the late 1940s and early 1950s, and most shoe stores had their own X-ray machines.

"We now know that X-rays can be dangerous, and that exposures should be limited to only those that are medically necessary," he says.

Joshua A. Kopel, MD, a professor of obstetrics, gynecology, and reproductive sciences at Yale, says there is no indication the widespread use of fetal ultrasound over the last three decades has influenced brain development.

"There is no evidence that our children are dumber than we are. If anything, studies suggest that they are smarter," Kopel says. "But any time an ultrasound is used there ought to be a medical question being answered."

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