Manual registration

Keep CT fixed and adjust PET's rigid position and orientation.

CT is fixed; PET is the moving layer.
CT is fixed; PET is the moving layer.

Adjust and verify

Choose Manual registration in fusion. In PET / FUSION, left-drag translates and right-drag rotates, taking priority over default windowing and zoom. Left-drag on the locator cross still repositions the locator. You can also enter parameters; full sampling updates on release. Check all three orthogonal planes, not just one direction.

Restore and save

Use Align centers, Reset, Load and Save. Reset restores the initial pairing transform. Registration files store transforms without modifying original DICOM. Loading verifies both source series.

Scope

Choosing another tool exits registration interaction. Automatic deformable registration is unavailable. Use CT/PET MPR for quantitative segmentation and VOI.