MPR, Advanced MPR, and 3D overview

This feature requires a separate license and may not be available. Contact your system administrator to have this feature licensed and enabled.

If enabled in eUnity, the Advanced Visualization menu is available to create MPR, obliques, curved MPR, and 3D volume rendered views.

1. Click and select the desired view mode. The differences between the modes is explained below.
   • MPR
   • Advanced MPR
   • Curved MPR
   • 3D

MPR

These layouts will generate axial, sagittal, and coronal planes from the selected series and display them in 3 horizontal or 3 vertical views. Slice navigation in this mode is similar to 2D stack navigation (e.g. mouse wheel and drag advances by the slice thickness). Basic MPR uses slice-based navigation, where possible. When it is not possible, for example, the gantry is tilted relative to the patient, or the patient is rotated relative to the table, it uses volume-based navigation. When slice-based navigation is used, the annotation overlay shows the slice numbers. When volume-based navigation is used, the annotation overlay displays NA in place of slice numbers.

In slice-based navigation, measurements that you make on a slice are retained for the duration of your session. Note however that annotations and measurements on reconstructed series cannot be saved as a Presentation State.

Advanced MPR

These layouts will generate axial, sagittal, and coronal planes from the selected series. Advanced MPR uses volume-based navigation and provides advanced features such as changing the slice thickness, changing the rendering type, and creating oblique / non-orthogonal stacks.

In volume-based navigation, measurements that you make will not be retained when you navigate away from the image containing the measurements.

Curved MPR

Use the Curved MPR tool to drop control points on curved anatomy to build a perpendicular sectional reconstruction.

3D

These layouts will generate volume-based axial, sagittal, and coronal planes from the selected series, and will also show a 3D volume rendered stack in one of the viewports.

Interactive mode in MPR / 3D view modes

Interactive mode is a special low-latency mode that prioritizes frame-rate and is enabled in fast operations such as adjusting Window Level on the fly, navigating the stack, or adjusting the 3D image render function or volume orientation on volume rendered stacks.

Note: Viewports in Interactive mode will display in the upper-right corner of the viewport to indicate that higher quality images are in progress.

For information on adjusting the quality of interactive or final images, see Advanced Visualization Parameters for 3D and MPR.

Annotations and measurements in MPR / 3D view modes

Certain annotations and measurements can be made in MPR, Advanced MPR, and 3D modes, however, they cannot be made on 3D MIP, 3D, and curved MPR series. Annotations and measurements that you make in MPR, Advanced MPR, 3D modes are available only for your session. That is, annotations and measurements on reconstructed series cannot be saved as a Presentation State.

To avoid incorrect measurements in rendered volumes, images that contain nonsquare pixels will not be rendered in Advanced Visualization modes. In this case, eUnity will display the following error message:  "MPR not supported on this series. The image pixels are nonsquare."

Navigating in reconstructed stacks

When you hold down the left mouse button and drag to navigate through a reconstructed stack (for example, an MPR stack), navigation will jump dynamically based on the length of the drag action. That is, images will be skipped so that you can quickly find the general location you are looking for. To move through images one at a time, use the mouse wheel or arrow keys.