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Pediatric Chest MDCT Using Tube Current Modulation: Effect on Radiation Dose with Breast Shielding

Courtney Coursey1, Donald P. Frush1, Terry Yoshizumi2, Greta Toncheva2, Giao Nguyen2 and S. Bruce Greenberg3

1 Division of Pediatric Radiology, Department of Radiology, Box 3808, Duke University Medical Center, Durham, NC 27710.
2 Radiation Safety Division, Duke University Medical Center, Durham, NC.
3 Department of Radiology, University of Arkansas for Medical Sciences and Arkansas Children's Hospital, Little Rock, AR.


Figure 1
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  		Fig. 1A —Phantom and shield used in this study. Anthropomorphic phantom representing 5-year-old child (Atom Pediatric 5-Year-Old Phantom, model 705-D CIRS) with metal oxide semiconductor field effect transistor (MOSFET) (Autosense MOSFET system, Best Medical Canada) detectors in place.

 

Figure 2
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  		Fig. 1B —Phantom and shield used in this study. Bismuth (F & L Medical Products) breast shield (arrow) in place.

 

Figure 3
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  		Fig. 2A —Measurement of noise. Regions of interest (ROIs) measuring approximately 170 mm2 were drawn in indicated areas (circles) at level of clavicles (A), scapulae (B), superior mediastinum (C), heart (D), and upper abdomen (E). C and D show ROIs obtained in range of shield (arrow).

 

Figure 4
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  		Fig. 2B —Measurement of noise. Regions of interest (ROIs) measuring approximately 170 mm2 were drawn in indicated areas (circles) at level of clavicles (A), scapulae (B), superior mediastinum (C), heart (D), and upper abdomen (E). C and D show ROIs obtained in range of shield (arrow).

 

Figure 5
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  		Fig. 2C —Measurement of noise. Regions of interest (ROIs) measuring approximately 170 mm2 were drawn in indicated areas (circles) at level of clavicles (A), scapulae (B), superior mediastinum (C), heart (D), and upper abdomen (E). C and D show ROIs obtained in range of shield (arrow).

 

Figure 6
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  		Fig. 2D —Measurement of noise. Regions of interest (ROIs) measuring approximately 170 mm2 were drawn in indicated areas (circles) at level of clavicles (A), scapulae (B), superior mediastinum (C), heart (D), and upper abdomen (E). C and D show ROIs obtained in range of shield (arrow).

 

Figure 7
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  		Fig. 2E —Measurement of noise. Regions of interest (ROIs) measuring approximately 170 mm2 were drawn in indicated areas (circles) at level of clavicles (A), scapulae (B), superior mediastinum (C), heart (D), and upper abdomen (E). C and D show ROIs obtained in range of shield (arrow).

 

Figure 8
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  		Fig. 3 —Tube current generated at each slice level for each scanning paradigm: z-axis Auto mA (GE Healthcare) tube current modulation, shield present in scout image (purple); z-axis Auto mA tube current modulation, shield placed after scout image was obtained (green); fixed tube current (65 mA) scanning (orange). Slice thickness was 5 mm. White rectangle indicates location of shield.

 

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