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Fig. 3. —Graph shows relationships between anterior surface midline
chest dose and milliampere-seconds at 120 kVp for four anthropomorphic
phantoms and two CT dose index phantoms. Peripheral chamber positions (1 cm
below surface) were used in standard CT dose index phantoms.
Sixteen-centimeter phantom CT dose indexp values underestimated
entrance exposure measurements for pediatric phantoms by approximately 10%.
Thirty-two-centimeter phantom CT dose indexp values underestimated
entrance exposure measurements for adult phantom by approximately
20–35%. 
=
adult phantom, 
= 10-year-old phantom, 
= 5-year-old phantom,
= 1-year-old phantom, # = 16-cm CT dose index phantom, 
= 32-cm
CT dose index phantom.
