Cardiac imaging includes coronary angiography and atrial and ventricular angiography, which have different indications. Coronary angiography evaluates the course and number of coronary vessels, malformations, stenosis, and the degree and extent of stenosis, as well as evaluates left heart function and the results of coronary artery bypass grafting or interventional procedures. On the basis of the examination, interventional therapy can also be performed according to the degree and extent of coronary artery disease. Coronary angiography is mainly used for patients with unexplained chest pain, unexplained arrhythmia, and unexplained left heart insufficiency suspecting coronary artery disease. Patients with recurrent angina after coronary artery bypass grafting or PCI often require coronary angiography for re-evaluation of coronary artery disease. Atrial ventriculography, on the other hand, examines the left ventricular ejection fraction as well as the presence of ventricular hypertrophy and ventricular septal defects. For cardiac structural abnormalities suspected by cardiac ultrasound, such as precordial heart disease, dilated heart disease, hypertrophic obstructive cardiomyopathy, etc., atrial ventriculography can be used to make a definitive diagnosis.