The Boxplot by RPID/Study report allows you to analyze dose indices by exam for one or more of your facilities.

To access the report, select Standardized Dose Index Reports from the Interactive Reports menu, then click the Boxplot by RPID/Study Description tab. You must first select at least one Facility ID and RPID / Study Description to create a report.


The rest of the report filters and parameters are set to default values and may be changed at any time:

  • DIR Measure (unit of measure): Dose Index type 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

  • Exam Year and Date range

  • Age Group

  • Query by: determines whether the RPID / Study Description filter uses standardized RPID exam names or Study Descriptions, as submitted by the facility

  • Body Part: restricts the RPID / Study Description filter to exams for the specified body part

  • Scanner(s)

  • Benchmarks: Data for the entire registry may be highlighted on the graph. The 75th percentile is selected by default. Only data for the oldest age group are used for benchmarking. Benchmarks are not highlighted in the following cases

    • User selects None

    • No registry benchmarks are available for the selected RPID

    • User selects Study Description for the Query by parameter

Note: DIR benchmarks are available only when Query by is set to RPID because Study Descriptions are not standardized and cannot be aggregated across DIR facilities.

The following example shows the distribution of measures for all head exams taken in the first three months of 2018, using the following criteria:

  • Data Type: CTDIvol Max across scans

  • Age Group: All

  • Date Range: January 1 – March 31, 2018

  • Scanners: All

  • Query by: RPID

  • Body Part: HEAD

Note: Using the Body Part filter is not required; however, selecting HEAD reduces the list of values in the RPID filter to only those related to that body part, making it easier to select only relevant RPIDs.

  • RPID: All

  • Benchmark: 75th Percentile

DIR Interactive Reports - Sample Boxplot by RPID 1

There are data for lots of RPIDs available during this period. Because benchmark values vary by RPID they are not displayed in the Age Group table and instead they appear as red lines for each boxplot.

The first RPID boxplot in the sample report, above, is an outlier relative to both the rest of the RPIDs and to the DIR 75th Percentile. Clicking on the axis label in the chart for this exam activates a filter which highlights that boxplot and updates the Age Group and Scanner tables to show data for that particular RPID only. Using the mouse to click on the highest data point shows details for that exam, including the DIR 75th Percentile benchmark of 53.19 compared to the exam CTIDvol maximum value of 490.2.

DIR Interactive Reports - Sample Boxplot by RPID 2

Clicking in any empty space on the graph clears the filter and resets the Age Group and RPID tables.

You can also use the Age Group and RPID / Study tables as filters. For example, clicking on the 147 exams in the 6 - 10 age group row restricts the boxplots to exams for that age group only.

DIR Interactive Reports - Sample Boxplot by RPID 3

Although there may be benchmarks available for this age group, they are not shown here because 6 - 10 is not the largest age group in the table. To see benchmarks, we must deselect Over 18, 15 – 18, and 11 – 14 from the Age Group filter so that 6 - 10 is the oldest group in the list.DIR Interactive Reports - Sample Boxplot by RPID 4

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