Ground Glass Program, Advanced Analysis

• segmentation of lung tissue
• calculation of the volume of both lungs, the right and left lungs separately
• determination of the average density value of lung parenchyma, standard deviation and median
• calculation of the volume and percentage of ground-glass opacity areas
• histogram of lung tissue distribution by density
• 3D model with color mapping of ground-glass opacity areas in halftones

Launching the Ground Glass Program

• Click on the toolbar, in the "Studies" group, on the "Programs" button or press the key on the keyboard
• Click the "Ground Glass" button

Selecting a Series for Analysis

• In the window that appears, click the down button
• Select a series in the "lung" reconstruction mode and click on it
• Click the "OK" button

Selecting a Mode for Analysis

Program Interface

• three panels with standard MPR display
• 3D model panel
• control panel with histogram and results table

The program will automatically perform lung segmentation and calculate ground-glass areas based on the default threshold
Automatically identified ground-glass areas are colored red

Settings for Quantitative Analysis of Ground Glass Areas

Setting Ground Glass Area Thresholds

Options for changing the ground glass area threshold:

• Click on the numeric value field and enter numbers from the keyboard
• Click the arrows next to the numeric value field to change the threshold
• Click the checkbox next to the "Maximum Ground Glass Density" item if you want to consider it in the calculation, and enter the value in the corresponding field in a similar way

Applying the New Ground Glass Area Threshold

Reverting to the Default Value

Coloring Control:

• Move the transparency slider (on the left, at the bottom) to the right
or
• Click the "Show/Hide Pathological Area Coloring" button / in the control panel
to check the correctness of the automatic coloring

Editing Ground Glass Area Coloring

• Click the "Delete Zone" button to remove an unnecessary area, or the "Add Zone" button to add an unaccounted area
• For both functions (deletion and addition):
  
  • Outline the necessary lung fragment on any of the MPR projections
  • Actions are similar to the "Closed Pencil" tool of the program
  • Scroll through the images, selecting all areas to be edited
• Undo the last edit - the last button in the row .

Editing Lung Segmentation (Extraction)

• and (add or remove lung area)
• For both functions (deletion and addition):
  
  • Outline the necessary lung fragment on any of the MPR projections
  • Actions are similar to the "Closed Pencil" tool of the program
  • Scroll through the images, selecting all areas to be edited

Results of Ground Glass Area Analysis

Saving Results

Saving within Vidar Dicom Viewer

Saving the Results Table

• If the region of interest (rows or columns of the table) is not selected, then all table data is saved
• Click the "Copy" button to copy the table to the clipboard for subsequent pasting into a standard text document
• Click the "Save" button to save the analysis results table to a *.csv format file for subsequent use in MS Excel
• Click the "Print" button to send the analysis results table for printing

Saving the Histogram

• Click the "Save Histogram" button under the histogram to save it to a user series (it will be located in the Preview Bar at the end of the study)
• Subsequently, it can be dragged onto the screen and printed

Saving the Entire Screen (Images, Histogram, and Table) to a User Series

• Click the "Save User Series" button under the table to save the entire screen to a user series (it will be located in the Preview Bar at the end of the study)

Exiting the Ground Glass Program Mode

• Click the "Ground Glass" button in the program header on the left
• Click the "Exit Mode" item