Automatically Registering CT and RG Series

For CT and RG modalities, use the Image Registration option to automatically line up current and historical series without having to manually insert a delta in each of the series. Image registration allows you to do the following for linked series:

• Synchronize scrolling
• Navigate to the same reference point with IntelliLink

Synapse uses an algorithm to compare and find the same anatomical body part in both the current and the historical series.

For example, if you have current and historical studies that contain an axial, sagittal, and coronal CT series, you can use automatic registration to link all six series in the Viewer at once.

Note:

Synapse uses an algorithm for image registration. You might need to manually change the delta for some series. See Enabling IntelliScroll. Apply Image Registration before fusing two studies. If you fuse two series and then apply Image Registration, the overlay series does not adjust according to the anatomy. When you apply a delta, Synapse uses that delta when you use IntelliLink. The following types of studies are not registered: Prior studies in the Series Picker that are not displayed on the Viewer VNA studies Image Registration compares the base series (from which Image Registration is invoked) to the target series of all other DICOM Frame of Reference (FOR) instances. The target series is one series per FOR and selects from the backend the series containing the largest section of anatomy. The selection of which DICOM FOR to compare against is based on the studies currently displayed in the Viewer Layout. The registration succeeds if the base and target series have very similar pixel data as the first priority (Rigid Registration). If they do not have similar pixel data, the process falls back to anatomical landmark matching. If both algorithms are unsuccessful based on the pixel data or anatomy of the base and target series, a warning displays that Synapse was unable to perform Image Registration. For more information, see Image Registration in the Synapse Administration Guide.

Prerequisites

The modality must be CT or RG.

Steps

Results

After completing image registration, Synapse links the current and historical series in the Viewer and changes the IntelliScroll linked to the same number for all the linked series. Use IntelliScroll to scroll through all the linked series or IntelliLink to move to the same reference point in the linked series.

Additional Options

• Click Image Registration on the icon menu.
• Press 5 to activate image registration with a keyboard shortcut.
• See Keyboard Shortcuts for IntelliLink and IntelliScroll.
• See Active Overlays for IntelliScroll.

Related Topics

Enabling IntelliScroll

Configuring Custom Shortcut Keys