A myocardial perfusion imaging test can typically take between 3 and 4 hours to complete. You will have small patches called electrodes placed on your chest, arms, and legs by your doctor. Your heart rate will be tracked by a machine connected to wires. Your blood pressure will also be recorded with a cuff on your arm. There are likely to be treadmills or stationary bicycles available for you to use. The doctor will inject a small amount of radioactive material into your bloodstream near the end of the exercise. As it circulates through your body, it will mix with your blood.