Working with Curvilinear Projection in MPR

Constructing a Curved MPR

• Click in the toolbar, "3D Navigation" group

  

  on the button

OR

• Press the key on the keyboard
  • Click the "General" tab
  • Click the button

The screen will be split into 4 frames.

• Begin constructing the reference curve on one of the projections by left-clicking
• Scroll through the images using the mouse wheel while continuing to draw the curve

Useful Tips

• While constructing, you can scroll images with the mouse wheel
• While constructing the curve, hide the 3D cursor and lines (key on the keyboard) to avoid interference
  After construction, restore them to the screen using the same method
• Enlarge the projection with the button in the active overlay for more precise construction, then reduce it to its original size with the button
• If you switch to any tool in the Toolbar, the construction curve will hide
  To make it reappear, press the button in the series header
• The current result will be displayed in the lower right frame
• Finish constructing the curve by double-clicking on the last point

Editing the Reference Curve of cMPR

• Right-click:
  1. Mouse cursor over a point - delete existing point
  2. Mouse cursor over the curve - add new points on the curve
• To add a point at the beginning or end of the curve, use the "More" item (see Measurement Manipulations)
• Left-click:
  1. Mouse cursor over a point - move points
  2. Mouse cursor over the curve - move the entire curve

Manipulating Curved MPR

• The 3D cursor synchronizes voxels on the resulting cMPR surface with orthographic projections
  It can be used to scroll through orthographic projections
• If the 3D cursor position matches the resulting cMPR, it is displayed on it
• Measuring line segment lengths is available on the resulting cMPR
  Segments perpendicular to the construction reference line (vertical) are measured accurately
  "Segments" measured along the reference line (horizontal) will show the length of a curve parallel to the reference line
  Other "segments" will measure distances on the reconstruction surface
• The angle values are unreliable
• Size values and statistics of planar areas are unreliable
• Point density values are quite accurate

Basic Curved MPR Settings

• Click the "cMPR" button in the upper left corner of the series
• Select the Settings menu item and click on it

• Reconstruction Thickness - the size of the construction zone in the plane of the construction curve
• Reconstruction Height - the size of the construction zone perpendicular to the plane of the construction curve
• Slice Step - the thickness of the reconstruction
• Rotation Around Curve - rotation of the long axis around the reference curve
• Extended Mode Settings - see Extended cMPR Representation
• - Restore default settings
• - Save settings

Saving Curved MPR Construction Results

Saving for Future Work

• The reference curve and reconstruction results are automatically saved in the Finds List upon exit (if program settings were not changed)
• To redisplay the reconstruction, click on it in the Finds List
• An unlimited number of reconstructions can be made and saved on one series

Saving for Export from the Application or Archiving

All cMPR Images

• Click the "cMPR" button in the upper left corner of the series header
• Select the item - "Save Resulting Series", and click it
• The entire resulting cMPR series will be saved
  In the Preview Bar - at the end of the study

To Save a Separate Image from Any of the Reconstructions

One Image:

• Activate (single click) the frame for saving
• Click in the toolbar, "Studies" group, "Save Image" subgroup:
  - will save only the image of the active frame to a user series

Entire Screen:

• Click in the toolbar, "Studies" group, "Save Screen" subgroup:
  - will save an image of the entire screen to a user series

Exiting Curved MPR Mode

Click the "Exit Mode" item in the cMPR menu The screen layout will return to standard

• Extended Curved MPR Representation