Reconstructing a curved planeTopic number: 1425412693551

Use curved planar reconstruction (CPR) to reconstruct curved planes defined by a longitudinal axis. The curved plane containing the CPR line that defines the axis can be visualized with various projection methods.

To reconstruct a curved plane

Open a study with volumetric data (CT or MRI).
Do one of the following:
- Apply a CPR hanging protocol.
  1. Open the hanging protocol gallery.
  2. Select a CPR hanging protocol.
  The CPR hanging protocol is applied to the Image area.
  Default CPR hanging protocols contain three MPR views, a predefined number of cross section views, and a CPR view.
- Create a CPR viewport.
  1. Drag a series into an empty viewport.
  2. Open the series toolbar.
  3. From the Select type of view list, select CPR.
  The CPR viewport type is applied.
Each time you apply a CPR hanging protocol, create a CPR viewport, or drag another series into an existing CPR viewport, a CPR group is created. This CPR group contains all CPR center lines created within the frame of reference of the series currently displayed in the viewport. CPR groups are numbered. Their number is indicated in the viewport.
Optionally, create a cross section viewport.
1. Do one of the following:
  - Create a new viewport. Then open the series toolbar.
  - In an existing viewport, open the series toolbar.
2. From the Select type of view list, select Cross section.
  A newly generated Cross section is automatically linked to the currently selected CPR group.
  If using multiple CPR groups, link the cross section to the appropriate CPR group:
  1. Open the series toolbar.
  2. From the Group list, select the appropriate group.
To open the CPR tool, in the clinical side bar, click CPR.

The CPR group for the series that is currently displayed in the viewport is automatically selected as the active group.

If other CPR groups are linked to the same frame of reference as the series that is currently displayed, you can select these from the Active groups list.
To activate the CPR line tool, click New center line.
Click to set the starting point of the CPR line in any of the MPR views.
Click to set further points defining the CPR line in any of the MPR views.
Use the mouse wheel to scroll through slices or drag respective interactive areas to pan or zoom the views while drawing the line.
Double-click or right-click to place the final point of the CPR line.
The center line is added with a system-generated name.
Note:
Regardless of the order in which points are set, the orientation of the CPR is vertically upright, from head to feet.

In the CPR tool pane, the following data is displayed:
- The overall length of the center line.
- The distance between two adjacent cross sections.
- The distance from the starting point of the center line to each of the cross sections.
Optionally, rename the center line:
1. Click the center line.
2. Type the name you want to use for this center line.
Optionally, move the center line:
1. Click Move center line. .
2. To move the center line, click the series in the CPR viewport, and drag the pointer.
Optionally, shrink or expand the center line:
1. Click Centerline shrink/Expand.
2. To shrink or expand the center line, click the series in the CPR viewport, and drag the pointer.
Optionally, to delete a center line, right-click the center line. Then select Delete.

The CPR view displays the default projection of the plane you defined with the CPR line. Depending on the applied hanging protocol, a predefined number of cross section views is displayed, as well as the main CPR and MPR views.

The cross section views show slices from a reconstructed series. These slices are orthogonal to the CPR line, and the first and last slice of the series correspond to the beginning and the end of the CPR line.

Tip:

To rotate the curved plane, use the scroll wheel in the CPR view.