Tissue damage occurs through the change in chemical properties of molecules in the tissue following exposure to radiation. Ionizing radiation can cause tissue damage. This material aims to provide a brief overview of the risk associated with medical imaging examinations that involve ionizing radiation. The risk is increased with the amount of exposure, repeated exposures, and when the patient is young. Nonetheless, the prevailing scientific view is that there is a finite (though small) amount of risk involved with such exposures. The exposure amount in these exams is very small, to the extent that the health risk associated with such low levels of exposure is frequently debated in scientific meetings. Many medical imaging examinations involve exposure to ionizing radiation.
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