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Original Research |
1 Department of Radiology, Duke University Medical Center, DUMC 3808, Durham, NC
27710.
2 Radiation Safety Division, Duke University Health System, Durham, NC
27710.
OBJECTIVE. The objective of our study was to determine the radiation dose to the female breast from current 16-MDCT body examinations.
MATERIALS AND METHODS. Metal oxide semiconductor field effect transistor (MOSFET) detectors were placed in four quadrants of the breast of a female-configured anthropomorphic phantom to determine radiation dose to the breast. Imaging was performed on a 16-MDCT scanner (LightSpeed, GE Healthcare) using current clinical protocols designed to assess pulmonary embolus (PE) (140 kVp, 380 mA, 0.8-sec rotation, 16 x 1.25 mm collimation), appendicitis (140 kVp, 340 mA, 0.5-sec rotation, 16 x 0.625 mm collimation), and renal calculus (140 kVp, 160 mA, 0.5-sec rotation, 16 x 0.625 mm collimation).
RESULTS. Radiation dose to the breast ranged from 4 to 6 cGy for the PE protocol and up to 1-2 cGy in the inferior aspect of the right breast and lateral aspect of the left breast for the appendicitis protocol. The renal calculus protocol yielded less than 150 µGy absorbed breast dose.
CONCLUSION. Current clinical chest and abdomen protocols result in vairable radiation doses to the breast. The magnitude of exposure may have implications for imaging strategies.
Keywords: breast • breast cancer • CT • radiation dose • women's imaging
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