In a method for visualizing at least one section of a wall of an atrium of the heart in a patient after an ablation for treatment of atrial fibrillation, a volume data record of at least the treated atrium of the heart in the patient is segmented to establish voxels that are of an inner surface, an outer surface, and a volume situated between the inner and outer surfaces of the wall of the treated atrium. The at least one section of the wall of the treated atrium of the heart is visualized by volume rendering or ray casting such that only voxel values of the established voxels that lie on the inner surface in the volume or on the outer surface of the wall of the treated atrium are used.
