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Skin and Thyroid Dosimetry in Cervical Spine Screening: Two Methods for Evaluation and a Comparison Between a Helical CT and Radiographic Trauma Series

Frank Rybicki1, Richard D. Nawfel, Philip F. Judy, Stephen Ledbetter, Rebecca L. Dyson, Peter S. Halt, Kirstin M. Shu and Diego B. Nuñez, Jr.

1 All authors: Department of Radiology, Brigham and Women's Hospital, 75 Francis St., Boston, MA 02115.



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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.

 


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  		Fig. 1B. —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.

 

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