Linking
eUnity provides linking tools so that you can perform common operations (navigate, zoom / pan, and optionally Window Level) across linked series. When you turn on Link mode, series are automatically linked by image plane (that is, all axial series are linked, all coronal series are linked, and all sagittal series are linked). When you scroll to navigate in one series, you will also scroll in all series that are part of the same link group. See more information on other Linking behaviors below.
The tool that you use to link series depends on if you want to link series across all studies (Link Studies) or if you want to link series only in the active study
The study that the currently selected series belongs to. (Link Active Study).
Link Studies
To link series across all studies:
- Click
Link Active Study
When you select a series from a study, it becomes the active study and Link mode will be enabled only for that study. The Link Active Study tool may need to be added to your toolbar or context menu. For more information, see Customize the toolbar or Customize the context menu or contact your system administrator.
To link series in only the active study:
- Click
Temporarily disengage linking across studies
When you temporarily unlink series across studies, the series within the same study will still be linked, but they will not be linked with series from other studies.
- Press the Alt key on the keyboard while you navigate, zoom, pan or adjust Window Level.
Indicators
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Not linked Shown in the viewport, a broken link indicator means that no matching slice could be found between the series. By default, the slices in linked series need to be within 5mm of each other to be considered for linking. If slices exceed the maximum threshold, the series will not be linked, and the broken link indicator will be displayed. |
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Series linked Shown in the viewport, a link indicator means the series is successfully linked. |
Linking behaviors
Navigation
For series that share frames of reference (that is, when the series contain information about the current anatomical position), the linked series will jump to the same slice position as the selected series. If a linked series does not have a slice within 5mm of the selected series location, the link is broken and the 
indicator is displayed in the viewport.
Series that do not share frames of reference will simply navigate from whatever starting position they are at. If the series are out of sync, you can temporarily disengage linking by pressing the Alt key and scrolling the mouse wheel to manually re-sync them.
If a series contains multiple planes, eUnity tries to find the closest slice that is the same orientation to the navigating series. If none is found, the link is broken and the indicator is displayed in the viewport.
Images without a plane will be linked under a separate linking group.
Zoom and pan
In Link mode, the current zoom factor and panning position is used from each on-screen image. Zooming and panning of the images is then relative to the selected image. That is, if you have already zoomed in or panned one image, that zoom / pan will not reset to its original state once linked. It will keep zooming and panning from its current state.
Window Level
For Window Level operations, series are linked by image plane and modality. That is, Window Level adjustments are only applied to series if they are both the same image plane and the same modality type. Note that Window Level linking is not turned on by default. It must be enabled by an administrator.