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Doctors are exploring ways to reduce the amount of radiation exposure from medical imaging tests in light of renewed concerns about the cancer risk, according to research presented at a radiology conference this week... "It's a very serious issue," says radiologist Sobhi Abadi of Ï㽶ÊÓƵ in Montreal, who presented his research Tuesday at a meeting of the American Roentgen Ray Society in San Diego. Abadi's study focused on reducing the risk of future breast cancer in women who have heart scans…