Dietary adjustments, intravenous injection, stabilization of heart rate and blood pressure, etc. are required before the cardiac imaging. 1. Dietary adjustments: the day before the examination should be prohibited from drinking caffeine, alcohol and sugary beverages, and you can have a normal diet on the day of the examination. Diabetic patients can drink a little milk and water to avoid vomiting when injecting contrast during the scan. 2. Leave an intravenous needle: do the ALLEN test before the examination, select the artery on the side of the operation and put the needle on the opposite side, and tell the patient to rest for half an hour after the examination, and pull it out if there is no adverse reaction. 3. Stabilization of heart rate and blood pressure: If the heart rate or blood pressure is high, it is necessary to calm the patient’s nervousness and take oral medication to control the blood pressure and heart rate if necessary. Good preparation for cardiography can shorten the examination time and improve the accuracy of the results, if you need to consult a specialist.