A Novel Ferumoxytol-enhanced Cardiac Magnetic Resonance for the Detection of Calcified Coronary Arteries

Inclusion Criteria: 1. Age ≥18 years, \<75 years; 2. Imaging specialists evaluate CCTA images taken within 30 days and report that calcification occupied one or more of the patient's vascular lumen at an angle of \>50% (using the coronary artery segmentation method recommended by the American Heart Association, including nine segments of the major branches of the coronary artery); 3. Patient who will undergo coronary angiography; 4. Patient with normal renal function or chronic renal insufficiency (CKD) stage 1-3; 5. Patient who signs the informed consent. Exclusion Criteria: 1. People who are allergic to iodine contrast media or have a history of allergy to iron or dextran or are allergic themselves; 2. Because of psychological (such as suffering from claustrophobic syndrome) or physical reasons (such as the presence of metal objects in the body) can not receive MRI examination; 3. suffering from terminal diseases (such as malignant tumors) or life expectancy \< 1 year; 4. Pregnant or lactating women; 5. People with limited hearing; 6. Patients with grade III-IV heart function; 7. Patients with a history of coronary artery stent implantation or coronary artery bypass; 8. Other iron agents are being used orally or intravenously; 9. Patients with hemosiderosis or hemochromatosis; 10. Patients with acute coronary syndrome; 11. Patients with hyperthyroidism; 12. Any other candidates deemed unsuitable by the researchers.