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. 2011 Nov;32(10):1776–1782. doi: 10.3174/ajnr.A2634

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© 2011 by American Journal of Neuroradiology

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Fig 2. — Between 2009 and 2010, there were significant reductions in DLP (milligrays per centimeter) for the total procedure as well as survey, guide, and contrast phases for all cases (A) and cervical-only (B) and lumbar-only (C) CT-guided spinal injections (P < .003 for all individual 2009 versus 2010 comparisons) (bar graph = mean ± standard error of the mean). The mean effective dose for cervical-only and lumbar-only CT-guided injections was reduced in 2010 from 9.7 to 1.1 mSv and from 17.5 to 3.3 mSv, respectively. DLP for some phases of the procedure also differed significantly within the same year (see “Results”).