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Relative contributions from the survey, guide, and contrast phases of CT-guided spinal injections changed substantially between 2009 and 2010. Significant reductions in DLP during the guide phase of the examination in 2010 lowered its contribution to total procedure DLP from 57% to 20%. In 2010, almost 75% of the patient dose came from the initial survey CT images obtained for identifying anatomy relevant to the patient's spinal pain and prescribing the course of needle insertion.
