Doctors who use CAT scans to diagnose heart attacks may begin to rethink that practice. Two recent studies found the scans more costly than beneficial.
A study in the New England Journal of Medicine last month found no evidence the CAT scans detected more heart attacks.
And a recent study in the Journal of the American College of Cardiology revealed about 500,000 of the tests are performed a year.
That study also found misuse of the scans dropped by 60 percent when doctors understood better when to use them.
"This is huge because its a radiation based test and people are exposed to a lot of radiation and risk of cancer goes up with one scan" said Kavitha Chinnaiyan, Beaumont Health System cardiologist.