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

To access the report, select CT Standardized Dose Index Reports from the Interactive Reports menu, then click the Boxplot by RPID/Study Description tab. 

Select at least one Corporate Account and click Apply to create the chart. By default, the report filters are set to retrieve exams for all facilities with study dates occurring within the past seven days for all RPIDs and scanners.

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

  • DIR Measure selects the Dose index type (CTDIvol, DLP, or SSDE) to be displayed using either the maximum value across scans or total for the exam

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

  • There are two separate filters for study dates

    • Include Data From specifies the time period to include, relative to today. The default is the past seven days

    • Exam Date displays the range of exam dates actually available and can be used to narrow the time frame to a range within the Include Data From time period

  • Age Group

  • Query by determines whether the RPID / Study description filter displays standardized RPID exam names or the facility’s Study Descriptions

  • Body Part restricts the RPID / Study filter to exams for the specified body part(s)

  • RPID / Study Description lists the available RPIDs or Study Descriptions, as determined by the Query by parameter setting

  • Scanner

  • Registry Statistics selects whether to show data for the entire registry on the graph. Only data for the oldest age group are used. Registry statistics are not available in the following cases

    • No registry benchmarks are available for the selected RPID

    • More than one RPID is selected in the RPID / Study filter

    • The Query by parameter is set to Study Description

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 / Study Description: All

  • Registry Statistcs: 75th Percentile

DIR Interactive Reports - Sample Boxplot by RPID 1

There are data for lots of RPIDs available during this period. Because registry statistics 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 RPID / Study tables to show data for that particular RPID only, CT HEAD ANGIO BRN STROKE (RPID325)in this example. Using the mouse to click on a data point shows details for that exam, including the DIR 75th Percentile of 53.19 compared to the exam CTIDvol maximum value of 191.5.

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 / Study tables.

Hovering over the grey areas of the boxplot shows the minimum, lower hinge (25th percentile), median, upper hinge (75th percentile), and maximum values. DIR Interactive Reports - Sample Boxplot by RPID 3

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 4

Although there may be registry statistics available for this age group, they are not shown here because 6 - 10 is not the largest age group in the table. To see registry statistics, 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.

Note: Not all RPIDs and age groups have registry statistics

DIR Interactive Reports - Sample Boxplot by RPID 5

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