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CT Scan Radiations may Lead to Cancer

nt modulation (ECTCM; a dose reduction strategy that reduces radiation during part of the cardiac cycle) decreased these risk estimates to 1 in 219 and 1 in 5,017, respectively.

Estimated cancer risks using ECTCM for a 60-year-old woman and a 60-year-old man were 1 in 715 and 1 in 1,911, respectively.A combined scan of the heart and aorta had higher LARs, up to 1 in 114 for a 20-year-old woman. The highest organ LARs were for lung cancer and, in younger women, breast cancer.

In this study, we observed a marked variation by age, sex, and scan protocol for cancer risk associated with radiation exposure from CTCA, the authors write.

The results of this study suggest that CTCA should be used particularly cautiously in the evaluation of young individuals, especially women, for whom alternative diagnostic modalities that do not involve the use of ionizing radiation should be considered, such as stress electrocardiography, echocardiography, or magnetic resonance imaging.

If CTCA is considered as an alternative to invasive coronary angiography, the risks and benefits of each test require consideration.

Contact the JAMA/Archives Media Relations Department at 312-464-JAMA or email: mediarelations@jama-archives.org.


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