But if there is a reason to believe that an x-ray or CT scan is the best way to look for cancer or other diseases, the patient will most likely be helped more than the small dose of radiation can hurt. In some cases, other imaging tests that don’t use radiation such as ultrasound or MRI may be an option. The usefulness of the test must always be balanced against the possible risks from exposure to the radiation. But radiation exposure from all sources can add up over one’s lifetime, so imaging tests that use radiation should only be done if there is a good medical reason to do so. The increased risk of cancer from exposure to any single test is likely to be very small. This is of particular concern for children, because their growing bodies are especially sensitive to radiation. In recent years, the average amount of radiation a person is exposed to from medical tests has risen. You can, however, limit your exposure to some sources of radiation, such as x-rays from imaging tests, radiation in the workplace, and radon in your home. Just living on this planet exposes you to some radiation.
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