The American College of Radiology reporting guidelines state that “comparison with relevant examinations and reports should be part of the radiologic consultation and report when appropriate and available.“Materials and MethodsWe evaluated the use of open-source Windows scripting software for the automated retrieval of the date and time of prior studies.Results and ConclusionThe date and time of the comparative study are transferred automatically to the present report in a structured voice recognition dictation system with a “regular expression substitution pattern” construct.