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Fig. 1A. —50-year-old woman with nondisplaced fracture of left C6 transverse process. Both axial helical CT scans were obtained at same level with 120 kVp, 3-mm slice thickness, and pitch of 1.5 and filmed in bone window settings (width, 2000 H; length, 500 H). Milliampere setting was 130 mA for A and 240 mA for B. Ionization chamber estimates indicate protocol for A delivered 14.1 mGy to thyroid, whereas protocol for B delivered 26.0 mGy to thyroid.