Marta Schulman, chair of the American College of Radiology Pediatric Imaging Commission, said the study adds to the impetus that patients should be scanned only when necessary and with the lowest dose of radiation possible.

美国正在努力限制对儿童过度使用CT扫描，包括2009年8月发起的"温柔成像"（Image Gently）倡议，该倡议由一个致力于改变医疗实践的医疗组织联盟牵头。

Efforts are under way in the U.S. to curb overuse of CT scanning in children, including the Image Gently initiative, launched in August 2009 and spearheaded by a coalition of health-care organizations dedicated to changing medical practice.

在6月6日发表的这项研究中，已经被诊断出癌症的病人或在做完CT扫描后二年内患上癌症的病人被剔除，以降低不接受CT扫描也会得癌的病人虚增风险计算结果的可能。

In Wednesday's study, patients who already had cancer diagnoses or who developed cancer within two years of a CT scan were excluded, to decrease the likelihood that risk calculations would be inflated by patients who would have developed cancer without getting a CT scan.

这项研究是五国机构研究人员的合作，它由英国卫生部（U.K. Department of Health）和美国国家卫生研究院（National Institutes of Health）共同资助。

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