To assemble the data we used for analysis, we used the dose monitoring software聽eXposure to automatically export dose metrics from consecutive scans in 2010 and 2012. For a subset of 50聽exams, we also collected dose metrics manually, copying data directly from the PACS into an excel spreadsheet.
Manual data collection for 50 scans required 2 hours and 15 minutes. eXposure compiled the data in under an hour. All dose metrics demonstrated a 30% to 50% reduction between 2010 and 2012. There was also a significant decline and a reduction in the variability of the doses over time.
The NQF measure facilitates an institution's capacity to assess the doses they are using for CT as part of routine practice. The necessary data can be collected within a reasonable amount of time either with automatic software or manually. The collection and review of these data will allow facilities to compare their radiation dose distributions with national distributions and allow assessment of temporal trends in the doses they are using.