Children who received two to three CT scans had an increased risk of brain tumours; and those who received four or more had a more than twofold risk.
are not at an increased risk of developing brain tumours, leukemia, or lymphoma. However, the study found that exposure to multiple scans significantly increases a child’s risk of developing these types of cancers.
To do this, the researchers examined national health records from more than 7,000 Taiwanese patients diagnosed with these types of cancers between 2000 and 2013. They then compared tumour rates for those who had had CT scans versus those who had not.For one CT scan, there was no increased risk of any of the cancers compared with no exposure.
has pointed out that a single or small amount of CT scans has no clear increased risk of developing subsequent childhood cancer.When human cells are exposed to low-dose radiation, small DNA breaks are generated and mended by an internal repair process, the authors state. Therefore, low-level CT exposure appears not to be carcinogenic.
Over the past 10 to 20 years, Whitlock said there have been a lot of advances in CT technology, meaning a scan today is likely to provide much less radiation exposure than one that was done ten years ago.
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