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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 6. — Lumbar-only procedures varied in the total number of sites (2.2 ± 1.3, 1–7) or levels (1.5 ± 1.0, 1–7) treated per encounter (mean ± SD, range), but the dose reduction observed persisted even when total examination dose (total DLP) was normalized for the number of sites (DLP/site) or levels (DLP/level) injected during the procedure (bar graph = mean ± SD). All 3 ways of analyzing procedural DLP showed approximately 80% reductions between 2009 and 2010 (P < .0001). Similar large dose reductions also persisted for cervical-only procedures when normalized for the number of sites or levels treated (P < .002).