ASC 2D–3D Registration
======================

Summary
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Register an ASC to X-ray images (2D–3D alignment). Use this to align patient X-rays with a 3D anatomical model.

Compatible data
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- One ``SharedImageSet`` with modality XRAY; one ``AnatomicalStructureCollection`` (optionally a second ASC as a shape model with PCA).

Input
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- ASC (3D), X-ray image(s) (2D).

Output
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- ASC pose aligned to X-ray(s).

Workflow
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1) Provide ASC and X-ray(s).
2) Use the 2D–3D Registration controller to configure projection and alignment settings.
3) Compute; validate the overlay in the viewer and accept if satisfactory.