Some CT scans may have too much radiation, researchers say

Unnecessarily high radiation doses in CT scans have been linked to cancers. Under new federal rules, doctors and imaging centers have to more closely track and report the doses that patients get.

Rebecca Smith-Bindman, a professor at the University of California-San Francisco medical school, has spent well over a decade researching the disquieting risk that one of modern medicine’s most valuable tools, computerized tomography scans, can sometimes cause cancer.

Smith-Bindman and like-minded colleagues have long pushed for federal policies aimed at improving safety for patients undergoing CT scans. Under new Medicare regulations effective this year, hospitals and imaging centers must start collecting and sharing more information about the radiation their scanners emit.

About 93 million CT scans are performed every year in the United States, according to IMV, a medical market research company that tracks imaging. More than half of those scans are for people 60 and older. Yet there is scant regulation of radiation levels as the machines scan organs and structures inside bodies. Dosages are erratic, varying widely from one clinic to another, and are too often unnecessarily high, Smith-Bindman and other critics say.

“It’s unfathomable,” Smith-Bindman said. “We keep doing more and more CTs, and the doses keep going up.”

One CT scan can expose a patient to 10 or 15 times as much radiation as another, Smith-Bindman said. “There is very large variation,” she said, “and the doses vary by an order of magnitude — tenfold, not 10% different — for patients seen for the same clinical problem.” In outlier institutions, the variation is even higher, according to research she and a team of international collaborators have published.

https://www.nbcnews.com/health/health-news/ct-scans-may-much-radiation-researchers-say-rcna195198

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