CT Brain Perfusion Program

Launching the CT Brain Perfusion Program

Left-click the "Programs" button in the Tool Panel, then - on the "Brain Perfusion" button

Settings when Starting the Program

• Select a different series
• Select the TTP reference point:
  • Start of series
  • Start of stable signal
  • Start of bolus
• Enable automatic motion correction
• Disable spatial and temporal smoothing
• The button restores the default Perfusion program settings
• The button saves user-defined Perfusion program settings

Appearance of the Perfusion Program

Main Mode

• Top:
  • Left - source volumes
  • Right - color maps (switching maps - via the active overlay on the map name)
• Bottom:
  • Left - averaged Temporal MIP map
  • Right - graphs and table

Maps

Selecting a Color Perfusion Map

Selecting a Different Map

• Click on the map name in the Active Overlay
• In the list that appears, click on the name of another map
• Maps already displayed on the screen are not active in the selection list

Selecting a Different Scale

• Click on the color scale
• In the list that appears, click on the name of another scale representation

Maps and Tables

Top:
• Left - averaged Temporal MIP map
• Right - color maps, with the ability to switch via the active overlay

Bottom:

• Graphs and table

Penumbra

• To include an additional parameter in the calculation, click the checkbox (check the box) next to the parameter
• To change a parameter value, use the sliders or the plus/minus buttons at their ends
• To quickly return to the default value, click the button next to the parameter
• Use the radio button to select the hemisphere (or - both)

Motion Artifact Correction

• Go to the CT Perfusion program settings and check the box next to "Motion correction"
• Scroll through the multi-volume in the main mode (Button - - in the series header)
  See Scrolling Multi-volumes
• In the volume list (in the series header), uncheck the boxes next to volumes with patient head movement

  

  Click anywhere on the screen to exit the volume exclusion mode

Correction of Reference Artery and Vein Cursor Positions

• Scroll through the multi-volume in the main mode (Button - - in the series header), (See Scrolling Multi-volumes) until the volume with filled vessels appears
• Click the button in the series header
• Correct the artery position:
  • hover the mouse cursor over the vessel cursor (white dot)
  • hold down the left mouse button
  • move the mouse to drag the vessel cursor
  • release the left mouse button
  If the vessel was identified incorrectly by the program, scroll through the images to the best vessel display and click on it with the mouse
• Click the button
• Correct the vein position
  Mouse actions are similar to those described above

Creating Regions of Interest

Creating Regions of Interest for Vascular Pathologies

• Click the Measurement Reflection Line button in the series header
• Adjust the measurement reflection line so that it coincides with the interhemispheric fissure by moving it entirely and dragging its ends with the mouse (hold down the left mouse button, drag, release)
• Click the "Reflected Oval" button to the right of the Reflection Line button
• Draw an Oval on the image, it will automatically be reflected in the contralateral hemisphere
• Data for both regions will appear on the graph and in the table

Creating Regions of Interest for Oncological Processes

• Draw any of the regions on any image
• Data for the created region will appear
• If reflection is needed (the Reflection Line must be on screen - see above):
  Click the "More" button , then - on the "Reflect Measurement" item

You can create an unlimited number of regions on any of the images
Each region is identified by a number and a color

Brain Perfusion Analysis

Editing Mathematical Data

• Viewing (selecting) data for a specific region
  • Click on the region name to the right of the graph,
  or
  • Click on the column header in the table
• Editing graph points
  1. For convenience, double-click the digital data panel to expand it to full screen
  2. Hover the mouse cursor over a graph point
  3. Hold down the left mouse button
  4. Move the mouse
  5. Release the left mouse button
  6. Double-click on the digital data panel to return it to its original size
• Saving mathematical data
  • If a region of interest is not selected as described above, then all data will be saved
  • Click the "Copy" button to copy the analysis results to the clipboard for pasting into a standard text document
  • Click the "Save" button to save the analysis results to a *.csv format file for subsequent analysis in MS Excel
  • Click the "Print" button to send the analysis results to print
  • Click the "Save Custom Series" button to save the on-screen image to a custom series (it will be located at the end of the study in the Preview Bar)

Calculation Settings

• Click the "Perfusion" button in the top left corner of the program
• Click on the "Settings" item
Calculation settings are described at the beginning of the article

Saving the Resulting Series

• Click the "Perfusion" button in the top left corner of the program
• Click on the "Save Resulting Series" item
The result series with all maps (CBV, BAT, etc.) will be saved and will be located in the Preview Bar, at the bottom of the current study

Note:
The state of the Perfusion program and all measurements performed are saved in the Study Finds
More details

Exiting the Brain Perfusion Program

• Click the "Perfusion" button in the top left corner of the program
• Click on the "Exit Mode" item
The Brain Perfusion Program will be replaced on the screen by the series from which it was constructed

If the "Brain Perfusion" Program Does Not Launch

• Make sure the series necessary for building Perfusion are present in the study
• If not, click the "OK" button to decline building Perfusion

If you are sure that the series necessary for building Perfusion are present in the study:
• Click the "More..." button



• Click the "Study Record" button
• The study will be automatically anonymized and packaged
  Choose a location on the disk to save the archived study file with the "zip" extension
• Send the obtained zip file to the programmers of Vidar Software LLC at med@povidar.ru with a description of the problem
The programmers of Vidar Software LLC will try to resolve the issue as soon as possible