The Wall Street Journal reports on a recent New England Journal of Medicine study which concludes that doctors are over-utilizing CT scans, exposing their patients to excessive, and potentially harmful, radiation doses:
Doctors are ordering too many unnecessary diagnostic CT scans, exposing their patients to potentially dangerous levels of radiation that could increase their risk of cancer, according to Columbia University researchers.
The researchers, writing in this week’s New England Journal of Medicine, conclude that in the coming decades up to 2% of all cancers in the United States may be caused by radiation from computed tomography scans performed now. Children face the most danger, they said.
In ordering CT scans, doctors are underestimating the radiation danger … In many cases, the researchers say, older technologies like X-rays and ultrasound that expose patients to lower radiation doses or no radiation at all would work just as well.
Since CT scans were introduced in the 1970s, their use has grown to an estimated 62 million annually. An estimated four million to five million scans are ordered for children, Mr. Brenner said. Adults receive scans for diseases of the stomach, colon, breast and other areas. Children most often are scanned for appendicitis. It has become a favored technology because it provides detailed information about patients’ bodies, is noninvasive and typically is covered by health insurance.
While the scans save lives, the authors say, doctors are leaning on them over safer diagnostic tools because they underestimate the levels of radiation people receive from the scans.
The authors measured typical levels of radiation that CT scans emit. They found levels they say were comparable to that received by some people miles from the epicenters of the 1945 atomic blasts over Hiroshima and Nagasaki, Japan.
There can be little doubt that CAT scans, as well as other expensive medical imaging studies, are overutilized in medicine today. There is also no doubt that the overutilization of CAT scans in particular, with their ionizing radiation, does expose patients to significantly more radiation. It may be worthwhile to pause and think about why so many CAT scans are being performed.
Hint: It’s not because doctors don’t know that CAT scans deliver more radiation.
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