Physicians should carefully consider the benefits of imaging such as cardiac CT since the risk of cancer from such radiation exposure is not known, said Dr. Brett Heilbron of St. Paul's Hospital in British Columbia. Heilbron says it is difficult to determine risk from low-dose tests, but other physicians reiterate the safety of imaging when used appropriately. "No dose is acceptable if it's not appropriate," said Dr Jonathon Leipsic, also of St Paul's Hospital. "But in the appropriate setting, cardiac CT is a safe test, and there's been an exponential reduction in dose over historical norms."
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