Rotational angiography (or three dimensional arteriography or "3DATG") is a new tool used to guide atrial fibrillation (AF) ablation. The current approach to imaging for AF ablation involves obtaining a computer tomography (CT) angiogram of the atrium pre-procedure and combining it with an electro-anatomical map, a process called merging or overlay. The investigators propose to investigate the quality of the 3DATG as a replacement for the CT in obtaining a left atrial angiogram (to guide AF ablation).