The Box Plot by Scanner report allows you to compare data between scanners within your facility or, if you have multiple facilities contributing data, you can compare scanners from one location to another. If you have a Master-Child hierarchy for your facilities, all scanners submitting data from Child locations populate in the Master. Log in to the Master facility to view all the scanners in one location.

You can access the report by selecting Box Plot by Scanner from the menu, after logging in to the report tool. The report may be filtered by

  • Data Type (unit of measure): CTDIvol, DLP or SSDE; either maximum value across scans or total for the exam

Note: Maximum and total values are equal for single-scan exams

  • Age Group

  • Exam Date range

  • Scanner(s)

  • Exam Type, using either RadLex Playbook IDs (RPIDs) or your facility’s Study Descriptions

Note: Only a single RPID may be selected at one time, but multiple Study Descriptions may be selected.

Select your criteria of interest and click Search to generate a report.

The following example illustrates how to identify which scanners are sending data and how many observations are available for a given time period. To create the sample report, below, we use the following criteria:

  • Data Type: CTDIvol Max across scans

  • Age Group: Adult and Pediatric

  • Date Range: October 1, 2017 to present

  • Scanners: All

  • Exam Type: Study Descriptions, All

DIR SDIR - Box Plot by Scanner Sample 1

The graph shows data for a large number of scanners. Although this graph contains too much data to be useful, the table below the graph shows which scanners sent data for the time period, how many observations are available, and other various statistics.

Note: The search function does not compare scanners across the DIR. It is for a facility’s internal use only.

Clicking the Large Image link, just below the data table, opens an enlarged version of the chart in a separate browser window.

Also below the table are statistics summarizing the number of exams by age group as well as a list of the scanners and exam types used for the query.DIR SDIR - Box Plot by Scanner Sample 2

Next, we cross-reference the list of scanners with the data table, by ID number, to refine the selection criteria to six specific scanners to create a more useful graph.

DIR SDIR - Box Plot by Scanner Sample 3

If we know which exam types are typically performed with these scanners we can select the relevant RPID to further refine the chart.

Note: You can use the Standardized Box Plot by RPID/Study Description report to identify which exams have data for a given set of scanners.

Using RPID as a criterion also provides the median value for that exam from across all DIR sites for the most recent aggregate report. Clicking the Large Image link provides a closer view.

DIR SDIR - Box Plot by Scanner Sample 4

Scanner 4 has a much higher mean CTDIvol Max Across scans compared to other scanners for RPID188, but it appears this is due to an outlier maximum value because the median for Scanner 4 is relatively close to other scanners and to the median of 14.94 across all DIR sites (shown in the bottom right corner).

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