MPR and 3D cursor
MPR and 3D cursor (crosshair)
Orthogonal multiplanar reconstruction (MPR)
The orthogonal multiplanar reconstruction (MPR) allows you to create, from the original plane (usually axial), images in the two other planes of the Euclidean space. Only planes along the 3 axes (x,y,z) can be displayed, an oblique plane cannot be obtained with this tool.
The MPR view can be opened with in the toolbar or by right-clicking on the thumbnail in the DICOM explorer.
The menu and the button are only active if the series contains at least 5 images.
When the tab containing the MPR views is selected, the crosshair tool is automatically applied on the left mouse button. Note that it is possible to change the window/level with the ctrl key while keeping crosshair selected.
By default, zoom and window/level are synchronized between the 3 views. The MRR views can be displayed in different layouts .
For more information on the elements related to the orientation of multiplanar views see MPR orientation.
3D cursor (crosshair)
The 3D cursor allows you to synchronize the position of several views sharing the same 3D coordinate system.
In order to know which series sharing the same coordinate system, you can select more than one series from the DICOM explorer by right-clicking on a series and selecting “Select related Series”. Then open the series selection by right-clicking again and selecting “2D Viewer > Open”
The crosshair tool can be selected in the mouse buttons on the toolbar or by right-clicking on a view.
From the main menu “File > Preferences > Viewer > MPR” (Since v4.1.0 ):
- Auto center axes: Allows you to choose a behavior to recenter the cursor in the different views. The position can be returned to the center systematically with the “Always” option (see the image above) or with the 2nd option only when the position is almost no longer visible (the default value).
- Crosshair gap at the center: Defines the size of the empty space in the center of the crosshair
- Default layout: The preferred layout used when opening the MPR viewer
The preferences apply to both the MPR and the 3D cursor.