Pediatric patient exposures from CT examinations: GE CT/T 9800 scanner

This report presents Computed Tomography Dose Index (CTDI) values for typical CT examinations of children for a GE CT/T 9800 scanner and compares them with measured entrance skin absorbed doses of pediatric patients under clinical situations. Pediatric entrance skin absorbed doses were 1.1-2.4 rad (cGy) for chest and abdomen examinations, 2.0-3.4 rad (cGy) for pediatric head examinations, and 3.2-4.2 rad (cGy) for infant (less than or equal to 6 months) head examinations. CTDI measurements in a cylindrical Lucite head phantom predicted typical pediatric absorbed doses to within about 5% for chest and abdomen examinations and to within about 15% for head examinations, when corrections for amperage differences are taken into account.