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Early First-Trimester Fetal Radiation Dose Estimation in 16-MDCT Without and With Automated Tube Current Modulation

Tracy A. Jaffe1, Terry T. Yoshizumi1, Greta I. Toncheva1, Giao Nguyen1, Lynne M. Hurwitz1 and Rendon C. Nelson1

1 All authors: Department of Radiology, Duke University Medical Center, Erwin Rd., Box 3808, Durham, NC 27710.


Figure 1
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  		Fig. 1 —Photograph shows anthropomorphic phantom (model 702, CIRS) with metal oxide semiconductor field effect transistor (MOSFET) detector in uterine location. Phantom at this level measures 19 x 32 cm. Arrow points to uterine detector.

 

Figure 2
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  		Fig. 2A —Metal oxide semiconductor field effect transistor (MOSFET) detector placement. Drawing shows detector representing fetal location in anthropomorphic phantom of woman during early pregnancy. (Adapted and reprinted with permission from Vladimir Varchena, Senior Engineer, CIRS, Inc.)

 

Figure 3
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  		Fig. 2B —Metal oxide semiconductor field effect transistor (MOSFET) detector placement. Slice 30 of phantom shows uterine detector (arrow).

 

Figure 4
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  		Fig. 3A —Graphs illustrate linear relationship between absorbed fetal radiation dose (D) and volume CT dose index (CTDIvol). Manual tube current (mA) mode, where D (mGy) = 1.665 x CTDIvol (mGy) – 7.059.

 

Figure 5
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  		Fig. 3B —Graphs illustrate linear relationship between absorbed fetal radiation dose (D) and volume CT dose index (CTDIvol). Automated tube current modulation mode, where D (mGy) = 2.151 x CTDIvol (mGy) – 2.200.

 

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