Responding to errors that resulted in CT brain scans exposing patients to excessive radiation, the U.S. Food and Drug Administration has sent a letter to a manufacturers’ trade group recommending precautions that could limit the risk.
The letter to the Medical Imaging and Technology Alliance proposes a series of modifications to CT (computed tomography) scanners, such as providing better training and clearer instructions to technicians, and equipping the devices with monitors and alarms to avoid exposing patients to too much radiation.
The FDA, which began investigating radiation exposures from CT scans in 2009, said it is aware of at least 385 patients who were overexposed at five hospitals in California and one in Alabama.
In July, The New York Times reported that more than 400 patients at eight hospitals received unnecessarily high doses of radiation from CT scans. Such high exposures are thought to increase the risk of cancer and of brain damage. Short of those maladies, some patients suffered symptoms ranging from strips of baldness to memory loss, The Times said.
“Improving patient safety is part of our public health mission,” said Jeffrey Shuren, director of the FDA’s Center for Devices and Radiological Health. “Patients should not have to worry that a device designed to diagnose an illness exposes them to unnecessary risks.”
CT brain scans are often used to determine whether a patient has suffered a stroke. The scans deliver a shot of radiation equal to about 200 X-rays. Nonetheless, the FDA said it is confident that the medical benefits outweigh the risks when the scans are done properly.
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http://www.xrayrisk.com is an independent educational website that provides information on radiation and cancer risk including an online calculator that lets you calculate radiation dose and estimate cancer risk from CT scans, x-rays and procedures. The site also allows users to log-in and track their imaging history.