Comparison of Coronary CT Angiography With Conventional Coronary Angiography in Liver and Lung Transplant Candidates

Inclusion Criteria: 1. Liver transplant candidates referred for invasive coronary angiography which include: * Patients with suspicious symptoms for CAD or; * Asymptomatic patients; * Abnormal non-invasive testing or 1 major risk factor for coronary artery disease or LVEF \< 60% on echo. 2. Lung transplant candidates referred for invasive coronary angiography which include: * Patients with suspicious symptoms for CAD or; * Asymptomatic patients; * Abnormal non-invasive testing or 1 major risk factor for coronary artery disease or LVEF \< 60% on echo in patients with low SVR (typical for ESLD). 3. Any ethnic background is acceptable. Exclusion Criteria: 1. Patients with contraindications for the use of iodinated contrast (allergic reaction, renal failure, multiple myeloma, etc) will be excluded. 2. Children and pregnant women will be excluded because of risks associated with radiation exposure. 3. Patients must have no atrial fibrillation, as this will interfere with cardiac gating for the examination. 4. Patients unable to give informed consent will be excluded as well.