Dynamic Contrast Enhanced Magnetic Resonance Perfusion Imaging in Congenital Heart Disease and Lung Disease

Inclusion Criteria: Cardiac Patients: 1. Patients \> 6 years of age 2. Patients with suspected or confirmed congenital or acquired heart disease 3. Who undergo a clinically indicated MRI scan, including gadolinium (MRI contrast medium) 4. And receive gadolinium (= MRI contrast medium) as part of their clinical investigation Pulmonary Patients: 1. Patients \> 6 years of age 2. Patients with a chronic and stable lung condition, such as cystic fibrosis, severe asthma. Exclusion Criteria: 1. Children under the age of 6 will be excluded as they are routinely scanned under general anesthesia 2. Patients in whom MRI is contraindicated (e.g. pacemaker, ocular metal, claustrophobia, tattoos) 3. Patients with a known allergy to gadolinium. 4. Patients with a history of allergic disposition or have anaphylactic reactions 5. Moderate-to-severe renal impairment (defined as having a GFR/ eGFR \< 60 mL/min) 6. Have Sickle Cell anemia 7. Known pregnancy, or breast feeding 8. Patient is uncooperative during a MRI without sedation or anesthesia