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. Author manuscript; available in PMC: 2017 Nov 17.
Published in final edited form as: J Emerg Med. 2014 Jan 10;46(4):582–587. doi: 10.1016/j.jemermed.2013.08.129

Table 2.

Distribution of Patient Studies by Ionizing Radiation Calculations and Anatomic Region Over 3 Years

Study Characteristics CT n (%) X-ray Study n (%) Coefficient k Effective Dose per Study (mSv, Calculated) (IQR)
Total studies      432 (26.2)    1216 (73.8)
Total radiation 1771.5 (92.9) 136.2 (7.1)
Anatomic region (number of studies)
 Head ± face     300 (69.4) 0 0.0021     2.44 (0.38)
 C-spine       64 (14.8) 0 0.0059   4.07 (3.9)
 Chest      30 (6.9)    804 (66.1) 0.014     7.55 (8.0)
 Abdomen/pelvis      38 (8.8)     18 (1.5) 0.015   14.55 (7.9)
 Extremity 0    361 (29.7) n/a
 Other 0     33 (2.7) n/a

CT = computed tomography; IQR = interquartile range.