Insufficient blood supply can be detected by ECG, coronary CTA and coronary angiography, cardiac ultrasound, flat panel exercise test, ultrasound dobutamine test, myocardial nuclear imaging and cardiac PET CT. 1. Electrocardiogram (ECG): ECG can show the number of heart beats, the heart rate, and can also find out whether there is myocardial ischemia. If there are changes in ST segment or T wave, it indicates the presence of myocardial ischemia and insufficient blood supply. 2. Coronary CTA and coronary angiography: Through coronary angiography, imaging of coronary arteries can be obtained to observe whether there is stenosis or occlusion in the blood vessels, so as to assess the blood supply situation. 3. Cardiac ultrasound: Through cardiac ultrasound, we can understand the form and function of the heart, the blood uptake of the heart, and assess the pumping function of the heart. 4. Plate exercise test: Evaluate the cardiovascular function by exercising on a treadmill or bicycle with testing function and observing the monitored results. 5. Ultrasound dopamine loading test: After infusion of a small dose of dopamine, myocardial contractility increases and myocardial oxygen consumption increases, at which time the ECG can be monitored to observe whether the heart has insufficient blood supply. 6. Myocardial nuclide imaging: A low energy, short half-life radionuclide is injected into the cardiovascular system, and a scintillation camera is used to observe the accumulation of these nuclides in the cardiovascular system to determine cardiac diseases. 7. Cardiac PET CT: The use of positronic nuclides to label glucose and other human metabolites as the imaging agent, through the cardiac foci of the uptake of the imaging agent to determine the disease. If you suspect that you have insufficient blood supply, you should go to the hospital for examination and treatment according to the doctor’s advice in order to avoid delay in treatment.