a. Presence of a pacemaker and/or ICD generator with any of the following limitations/conditions are excluded: i. Manufactured before the year 2000, ii. Leads implanted < 6 weeks prior to signing informed consent, iii. Non-transvenous epicardial, abandoned, or no-fixation leads, iv. Subcutaneous ICDs, v. Leadless pacemakers, vi. Any other condition that, in the judgement of device-trained staff, would deem an MRI contraindicated.