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Radiation Dose to the Female Breast from 16-MDCT Body Protocols

Lynne M. Hurwitz1, Terry T. Yoshizumi1,2, Robert E. Reiman1,2, Erik K. Paulson1, Donald P. Frush1, Giao T. Nguyen2, Greta I. Toncheva2 and Philip C. Goodman1

1 Department of Radiology, Duke University Medical Center, DUMC 3808, Durham, NC 27710.
2 Radiation Safety Division, Duke University Health System, Durham, NC 27710.


Figure 1
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  		Fig. 1A —Anthropomorphic female phantom. Photograph shows adult female phantom (model 702, CIRS).

 

Figure 2
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  		Fig. 1B —Anthropomorphic female phantom. Diagram shows detector location for absorbed radiation dose to breast from 16-MDCT body protocols. Numerals indicate clock positions.

 

Figure 3
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  		Fig. 2A —X-ray beam pattern over breast for appendicitis protocol. Unexposed film in yellow folder overlies lower thorax and upper abdomen of phantom.

 

Figure 4
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  		Fig. 2B —X-ray beam pattern over breast for appendicitis protocol. Exposed film after CT shows black lines (more exposure) when X-ray beam course is anterior to patient alternating with white lines that are produced when X-ray beam is posterior to patient. Note that MOSFET (metal oxide semiconductor field effect transistor) sensor size and location in breast do not permit direct exposure unless helical course brings X-ray beam precisely over detector. Red dots indicate location of MOSFET detectors at 9-, 6-, and 3-o'clock positions.

 

Figure 5
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  		Fig. 3 —Bar graph shows radiation dose to female breast from pulmonary embolus protocol on 16-MDCT of chest. Numbers above each column represent absorbed dose; error bars are for one standard deviation. Rt = right, Lt = left, B = breast. Numerals in x-axis indicate clock positions.

 

Figure 6
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  		Fig. 4 —Radiation dose to female breast from appendicitis protocol on 16-MDCT of abdomen and pelvis. Numbers above each column represent absorbed dose; error bars are for one standard deviation. Rt = right, Lt = left, B = breast. Numerals in x-axis indicate clock positions.

 

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