Medical imaging (Computed Tomography or CT scan, X-rays, MRI etc.) tests have become increasingly concerned about their overuse, especially its CT scan variety. The radiation risk from a single CT scan may be not that big, but radiation exposures add up over a lifetime. In fact, imaging tests should be done when there is a clear benefit. Before undergoing a diagnostic scan, ask the concerned doctors — if the test is really necessary and whether it really improves your health. And do not forget to ask if there is a non-radiation alternative, such as ultrasound.

Today on average people are exposed to about six times radiation from medical imaging than they were two decades ago. CT scan is a procedure using specialised X-ray equipment which provides detailed images of bones, organs and tissues. A CT scan takes many X-rays at different angles to produce a three-dimensional image. This is why, the radiation exposure from a CT procedure is higher than from a conventional X-ray.

It is true that cancer from radiation takes a number of years to develop, but it is mostly vital to minimise avoidable CT scans — particularly in younger patients. An analysis of seven healthcare systems in the U.S. has found that paediatric radiation exposure from CT scans can potentially double the risk of cancer caused by radiation. They should only have a CT scan if it is justified by a serious condition that risks their health.

Because of the possibility of an increased risk, nevertheless, the American College of Radiology advises that no imaging exam be done unless there is a clear medical benefit. So, before having any imaging scan, chat about the pros and cons with the doctor.

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