A recent study published in JAMA Internal Medicine has raised concerns about the potential link between computed tomography (CT) scans and an increased lifetime risk of cancer. Researchers from the United Kingdom and the United States estimated that CT scans could contribute to approximately 103,000 new cancer cases annually in the United States, accounting for about 5% of all new cancer diagnoses. The study highlights the cumulative effects of ionizing radiation from these scans, which have seen a 30% increase in usage since 2007.
Despite these findings, experts emphasize that the overall risk remains low and that CT scans are essential diagnostic tools that can save lives by enabling early detection of various cancers. Dr. Rebecca Smith-Bindman, the study’s lead author, noted that while the benefits of CT scans are significant, the potential harms associated with exposure to radiation should not be overlooked.
The American College of Radiology (ACR) responded by stating that no studies directly link CT scans to cancer while underscoring the importance of these imaging tests. Other medical professionals echoed this sentiment, asserting that the benefits of CT scans often outweigh the risks, especially in cases where they can inform treatment decisions.
The study found that children and adolescents are at a higher risk for radiation-induced cancers compared to adults, with lung, colon, and breast cancers being the most common among adults, and thyroid cancer prevalent among children.
Researchers suggest that ongoing monitoring and adjustments in CT scan practices could help mitigate risks. Patients are encouraged to discuss the necessity and risks of CT scans with their healthcare providers to make informed decisions regarding their medical care.