Deformable Spine-to-Spine Registration

Summary

Deformably aligns a moving SpineData to a fixed SpineData by registering their meshes. Use this to align a patient to a template or perform longitudinal alignment; the algorithm transforms associated features (keypoints, splines, point clouds, other meshes) and can transfer face labels to the fixed mesh.

Compatible data

Requires two SpineData inputs: one fixed and one moving.

Input

Fixed SpineData, Moving SpineData.
Must have sufficient overlap in anatomical structures between fixed and moving.

Output

Registered moving SpineData. Only structures present in both inputs are included.
Optionally, moving SpineData content transferred to the fixed SpineData.

Key parameters

Pre-Alignment using keypoints (bool): Use keypoints to initialize alignment.
Perform registration (bool): Enable the deformable step; turn off to transfer labels only.
Transfer to fixed mesh (bool): Transfer face labels/features from moving to fixed mesh.
Demons smoothing: Half Kernel Size (double).
Volume-based mesh registration: Distance field cut-off (double), resolution (double).

Workflow

Select fixed and moving SpineData.
(Optional) Enable keypoint pre-alignment.
Run registration; verify alignment of vertebrae and sacrum/ilium.
(Optional) Enable transfer-to-fixed to propagate labels/features.