Registering comparison studies by applying a registration hanging protocolTopic number: 1425412790295

Registration enables you to compare studies with active study data to align them for reading. Registration works for volumetric CT/MR and NM/PT data only.

CAUTION!

Comparison study data is reformatted during registration. This icon warns that a viewport contains reformatted rather than original image data:

Reformatted

To register comparison studies by applying a registration hanging protocol
  1. In the Image area, load both active and comparison study series.
  2. In the Image area top toolbar, click Hanging protocol gallery. Hanging protocol gallery
  3. Select and apply the registration hanging protocol for the current modality and the applicable number of diagnostic screens.

    A progress bar in the viewport of the comparison series indicates that registration is being calculated. After a successful registration, the registered series are linked for navigation, pan, zoom, and rotation. If the active and comparison series are of the same modality type, they are also linked for window level.

  4. Use the tools in the Registration > Manual correction tab of the Clinical sidebar to manually adjust the registration, if needed.

While a registration hanging protocol is active, you can drag more series into the comparison viewport to also register them with the active study.

To switch back to the original images, open the Hanging protocol gallery and select a different hanging protocol.

WARNING!

Cursor mode functionality (Locate a point in other series) can be restricted or inaccurate while working with registered studies. The accuracy of registration strongly depends on the source data used for calculation.

When you are viewing more than one study of interest, make sure that all studies are registered as separate pairs (for example, study A is registered with study B and C, as well as study B is registered with study C). Do not rely on a chain of available registrations to locate a lesion, for example, because the inaccuracy of a single registration accumulates to a less accurate position mapping. The following would be a bad example of a chain: study A is registered with study B and study B is registered with study.