Improved semi-automatic basket catheter reconstruction from two X-ray views

Abstract

Ablation guided by focal impulse and rotor mapping (FIRM) is an alternative treatment for atrial fibrillation in particular for persistent atrial fibrillation. To this end, a basket catheter comprising 64 electrodes is inserted into both the right atrium and left atrium under X-ray guidance to locate electric anomalies. The 3D positions of the electrodes are needed to determine the ablation region. We propose a improved model-based method for 3D reconstruction of this basket catheter based on two X-ray views. In our experiments, we found that the proposed approach outperformed our previous approach. The median error using the proposed method are 1.5 mm for phantom data and 2.6 mm for clinical data. We also introduced a novel error metric, the overlap rate between ground truth ablation region and reconstructed ablation region. The overall mean overlap rate under optimized viewing angle conditions is 84 ± 14% for phantom data and 72 ± 16% for clinical data.