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myQA StarTrack3 - Measurement Analysis

  • Updated

The Measure workspace supports the analysis of a single measurement or the pairwise comparison
between two measurements. The analysis consists of:

  • PROFILES tab: Here the user can see two 1D plots of profiles (either inline & crossline or diagonals). The profiles of the selected measurement and the comparison (if selected) are superimposed in the same plot. See Section 7.2.2.1 for more details.
  • 2D CHART: 2D false color map of either the selected or comparison measurements. See Section 7.2.2.2 for more details.

  • ENERGY tab: Here the user can see the Energy Validation Results and Raw Data (relative dose) of the selected measurement. See Section 7.2.2.3 for more details.

    The energy tab is only visible for the measurement if:

    • An Energy plate (Photons or Electrons) is set as phantom.
    • The Energy is specified.
    • The Energy type (Photons / Electrons) is consistent with the selected plate

  • Numerical Analysis Table: Analysis performed for all four profiles directions (inline, crossline and
    diagonals). See Section 7.2.2.4.

    It includes the parameters: Average signal of 9 central pixels, profile analysis according to the default protocol (defined in General configuration), and energy parameter (TMR20,10 or R50, shown only if a plate is defined in device setup).

General analysis options:

  • Signal scaling: relative, counts or dose (if the calibration is available)
  • Projection: measurement plane or isocenter plane (if SDD and SAD are defined). For measurements
    taken in the SW, SAD is defined as long as the machine is defined.

  • High resolution mode: (off axis ion chambers close to main axes are moved to the axes to artificially improve resolution) The use of high-resolution mode is beneficial for all symmetric fields. It generates artifacts only if the field edge lays along one main axis.

    High Resolution mode is the default unless changed by user. The change persists for subsequent logins.

Note: If datasets which are measured with systems different from myQA StarTrack3 are selected in the list, some analysis options may not be available (e.g., energy parameter, or one or more profile directions, for WP data).

 

Corrected Measurements List

A list to the left of the Measure page contains the measurements satisfying one of the following criteria:

  • Recent measurements, selected according to the acquisition time, location, machine, energy filtered
  • Measurements added from the explorer using the Add to measurement workspace button. See Section 9.2.

  • The new measurement is added to the list of Corrected Measurements on the left side of the main
    display of the Measure page.

    For each measurement, only the main data of the
    measurement is shown: 

    • Name
    • Acquisition time
    • Machine
    • Energy
    • Field size (if applicable)

  • Click on a measurement to display its details to the right.

  • Click on the Measurement menu to:

    • Select the measurement for comparison (Section 7.2.4)
    • Set the measurement as a reference (Section 7.2.1.2)
    • Delete the measurement (Section 7.2.1.5)
    • Export as OPG or CSV (same function is available in explorer)
    • Flip & compare: the measurement is automatically compared with a flipped version of itself. With flipping both data coordinates are reversed (x->-x, y->-y)

Items are not influenced by the filter, but they can be hidden or removed from the list using specific
commands.

Imported Measurements

Water phantom (WP) measurements, as well as measurements acquired with Sun Nuclear ICProfiler, can be used for comparison to device measurements.

Data of imported measurements can be edited in the Details panel the same way as myQA StarTrack3 measurements acquired in the Web App.

See Section 9.2 for information on importing measurements.

Set Reference Measurement

  • Open the menu for the Measurement (1), and click Set as reference (2) to mark a Measurement as a Reference.

    • A Measurement can be marked as a reference if Machine, Energy, Field size, and SDD are defined.
    • A reference is automatically offered as a comparison for another measurement in Measure page the list if it has the same Energy, Field size and SDD. Additionally, if Wedge and or SSD are defined for a Measurement, the Reference must fit these parameters as well.

    If a measurement can be used as a reference with the selected Comparison measurement, it will have a
    grey star next to it (3).

  • The measurement will have a gold start indicating it is a Reference.

  • If a measurement reference is present in the list of Measurements, select Load reference to automatically set the measurement for comparison with an active Reference.

  • To remove a measurement as a reference, simply open the menu and click Remove as reference.

Filters

  • To filter the list of Corrected Measurements, click the Show Filters button.

  • Measurements can be filtered by Date Range, Clinic Location, Machine, Energy type and amount.

  • Select Show added measurements to include imported measurements. Please note, this is only available if there are imported measurements in the SW.
  • Click the Clear filters button to clear any applied filters.
  • Click the Hide filters button to close the filter options.

Exporting data

The user can export myQA StarTrack3 datasets.

  • Integrals as text: OPG and CSV files
  • Export frames. A ZIP file containing the BIN movie, as well as additional data.

  • Click on the Measurement menu and select Export as OPG / CSV.

  • The measurement will be exported and downloaded as the selected file type.

Delete a measurement

  • Select Delete from the dropdown list.

  • Confirm by clicking the Delete button.

 

Plots and Numerical Analysis

Profiles tab

One or two 1D plots are displayed in the Profiles section; either inline & crossline or diagonals. The plots
are automatically displayed side by side (high resolution screens), or one above the other (low resolution
screens) to optimize screen area.

  • The profiles of the selected and comparison measurements are superimposed in the same plot.

  • Select which profile directions to view in the workspace (profile directions are in the LINAC reference
    frame):

    • For profiles, the left or bottom plot is Crossline [LR^1] and the right of bottom plot is Inline [GT^2].
    • For diagonals, the left or bottom plot is the Rising Diagonal --/++, the right or bottom plot is the
      Falling Diagonal -+/+-.

    Profile / Diagonal 

    Negative 

    Positive
     

    Crossline [LR]

    Left

    Right

    Inline [GT]

    Target

    Gun

    Rising Diagonal --/++

    Left Target 

    Right Gun

    Falling Diagonal -+/+-

    Left Gun 

    Right Target

    1: Comparison and Selected Measurement icons, 2: Plot Navigation, 3: Plot value information

// ^1 Left-Right ; ^2 Gun-Target

  • Click Options to adjust the display mode, projections, and chart options:

    Table 7.2. Unit scaling options for myQA StarTrack3 measurements

    Unit

    Description

    Relative

    (default, if
    available)

    The normalization value is the average of 9 central pixels (possibly excluding
    defective ones).

    Relative units are available if the normalization value has a numerical value
    (i.e., it is not NaN).

    Counts

    (default if relative
    isn't available)

    If “counts” is selected for signal units, signal values are displayed with
    scientific notation

    Available if all profiles have been measured with a myQA StarTrack3

    Dose 

    		Available if all analyzed measurements are calibrated to dose.
  • Click on the Comparison or Selected measurement icons (1) to remove or add them from the plot.

  • Use the icons to the right of each plot (2) to display different views and information:

    Icon

    Item

    Description

    1D Plot
    information

    To Pan, click on the Chart and drag over the desired plot area.

    To Zoom in and out, either:

    • Use the mouse-wheel (desktop) or pinch-zoom (mobile), or
    • Hold the Shift key and select an area.

    Expand

    		Opens a full screen view of the plot and of the analysis table. Click X to close the expanded window.

    Reset
    Zoom 

    		Resets the plot to

    CAX

    		Click to display the cursor at CAX position for the selected measurement.

    MAX

    		Click to show the cursor at the position of the max value of the selected measurement (and if the comparison is shown, the interpolated value of the comparison measurement at the same x coordinate.)
  • Hover over a plot to show the signal at the selected location. This value is displayed under the plot (3).
    The CAX and the Max values are also displayed here.
    • Cursor position and signal at cursor position (from linear data interpolation)
    • Position and signal of the central pixel (CAX)
    • Position and signal of the pixel with maximum signal (Max)

IMPORTANT NOTICE: INVALID DATA
If there is only invalid data, the 1D plots and 2D map are not shown. They are replaced by the message: “The selected measurements do not contain valid data points".
If one or more pixels to be displayed have a valid signal value, whilst other pixels are invalid. Valid data are shown in 1D plots and 2D maps and invalid data are ignored.

 

2D Chart tab

  • Under the 2D CHART tab, the user can see a 2D false color map of either the selected or comparison measurement.

  • Click Options to adjust the display mode and projections.

Energy tab

The energy tab is only visible for the measurement if:

  • An Energy plate (Photons or Electrons) is set as phantom.
  • The Energy is specified.
  • The Energy type (Photons / Electrons) is consistent with the selected plate

  • Under the Energy tab, the user can see the Energy Validation Results (1) and Raw Data (relative dose)
    (2) of the selected measurement.

  • If a measurement is set to Comparison, it will appear in the table with the Reference measurement.

For additional information on Energy Validation please see Section 10.2.

 

Photon Energy Validation in measurement workspace

Prerequisite: The selected measurement satisfies all of the following requirements:

  • It has been acquired with a myQA StarTrack3
    device
  • The radiation type Photons is specified
  • A Photon Energy plate has been used

Note: If two measurements are selected for comparison, only one needs to satisfy the above
requirements.

  • The RESULTS table shows the selected measurement.
    If a measurement is selected for comparison, it will appear in the table as well.

  • Columns are shown for:
    • Measurement name
    • Energy
    • Plate
    • Energy metrics (TPR_20,10*)

  • The RAW DATA (RELATIVE DOSE) table shows:

    • Water equivalent depth (mm)

    • Relative Dose ( % ) - Crossline negative

      Relative dose (%) - Crossline negative is R(xi))|_xi<0

    • Relative Dose (%) - Crossline positive (for every measurement satisfying the prerequisites)

      Relative dose (%) - Crossline positive is R(xi))|_xi>0

    The Dose ratio columns contains the pixel signals normalized to their maximum value.

  • In the table, the rows display every measurement point used in the validation.

  • Hover over the Info icon to show the crossline orientation of the plate:

 

Electron Energy validation in measurement workspace

Prerequisite: The selected measurement satisfies all of the following requirements:

  • It has been acquired with a myQA StarTrack3 device
  • The radiation type Electrons is specified and matches the plate type
  • An Electron Energy plate has been used (Electron Energy Plate RW3 + [thickness])

Note: If two measurements are selected for comparison, only one needs to satisfy the above
requirements.

  • The RESULTS table shows the selected measurement.
    If a measurement is selected for comparison, it will appear in the table as well.

  • Columns are shown for:
    • Measurement name
    • Energy
    • Plate
    • Energy metrics (R50*)

  • The RAW DATA (RELATIVE DOSE) table shows:

    • Water equivalent depth (mm)
    • Relative dose ( % )
  • The Relative dose column displays:
    • The normalize signal of pixels under absorbers
    • The normalized average of 9 central pixels
    • All these values are normalized to their maximum
  • In the table, the rows display each of the 9 measurement points used in the validation

Numerical Analysis Table

Under the 1D Plots, the Numerical Analysis table is shown.

  • Select a measurement from the list to display the Numerical Analysis results. The Selected and Comparison values will be displayed.

    The table away displays Measurement name, Direction, and the average of 9 central pixels (Signal of central point).

    Other profile analysis parameters will be displayed based on the selected protocol (e.g., symmetry, flatness, field width)

  • The analysis protocol used is shown under the table. Click the dropdown menu to change the protocol.
  • Click Reset to default protocols to return the calculation to the default settings defined in the
    Protocols tab under Settings.

 

Measurement information

  • Detailed measurement information is displayed to the right of the main display.

    Available information includes general information, beam parameters, calibrations & corrections, device setup, phantom setup, and additional parameters.

    Note: If a measurement has been set as a reference, the information is not editable.

  • GENERAL INFORMATION, BEAM SETUP, and DEVICE SETUP can be edited:

 

Comparisons

  • Open the Measurement menu , and click Select for comparison.

  • The measurement will have a dotted line around it, and the comparison icon.

  • Select another measurement from the list to generate the comparison.

  • The detailed measurement information will now display the Selected measurement and the Comparison.

    Note: The information of the reference measurement cannot be edited. To enable editing, remove it as a reference.