Constrained registration for motion compensation in atrial fibrillation ablation procedures

Area of Science:

• Medical Imaging
• Computational Anatomy
• Interventional Cardiology

Background:

• Fluoroscopic overlay images aid catheter ablation for atrial fibrillation (AFib).
• Cardiac and respiratory motion compromise overlay accuracy.
• Existing methods for 3D motion compensation require biplane imaging or offer limited 2D functionality with monoplane X-ray.

Purpose of the Study:

• To develop a method for full 3D motion compensation using only monoplane X-ray images.
• To improve the accuracy and workflow of catheter ablation guidance.
• To overcome limitations of previous 2D/3D registration techniques.

Main Methods:

• A patient-specific motion model is established using a biplane sequence during a training phase.
• A constrained, model-based 2D/3D registration method tracks circumferential mapping catheters.
• The approach facilitates 3D motion compensation with monoplane X-ray imaging.

Main Results:

• The constrained monoplane 2D/3D registration achieved an average 2D tracking error of 0.6 mm and 3D error of 1.6 mm.
• This outperformed unconstrained registration, which had a 3D error of 3.2 mm.
• The method offers a more seamless workflow, eliminating the need for catheter model re-initialization during C-arm repositioning.

Conclusions:

• The proposed method enables accurate 3D motion compensation in AFib catheter ablation using monoplane fluoroscopy.
• It enhances procedural workflow and accuracy compared to conventional techniques.
• The approach can be combined with biplane methods for a balance of accuracy and reduced radiation exposure.