A toddler tumbles down stairs, a preschooler falls off a tricycle or a teen gets clobbered in football, and it's pretty likely the emergency room will order a CT scan to make sure they're OK.

But the majority of children with minor head injuries turn out to be fine, meaning too many kids are needlessly exposed to the scans' radiation, say specialists developing new guidelines that aim to cut by a third unnecessary CT scans of children's brains.

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