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Organ Doses and Associated Cancer Risks for CT Examinations of Thorax

The use of computed tomography (CT) is increasing rapidly and doses are not negligible especially when medical procedures require more than one CT scan. The objectives of the present study were to measure doses in/on an anthropomorphic Rando phantom during standard and low dose CT protocol of thorax and to estimate radiation risks for adult patients that undergo multiple CT scans of thorax. Thermoluminescent (TL) and radiophotoluminescent (RPL) dosimeters were used for dose measurements. Radiation risks of cancer incidence, in the form of lifetime attributable risk (LAR), were estimated using BEIR VII model. For five exposures with standard protocol mean organ doses were 94 mGy (breast), 85 mGy (stomach), 85 mGy (thyroid), 78 mGy (lung), 52 mGy (liver) and 16 mGy (colon). For standard CT protocol associated LARs were found to be up to 0.401% (breast cancer) and 0.116% (lung cancer) for women and men respectively. Low dose protocol reduces doses (and risks) by the average factor of 5 and therefore the use of low dose protocol is recommended whenever it is medically justified

Organ doses ; cancer risk ; CT

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