Thermography is a diagnostic method which is totally non-invasive, painless and safe for both a patient and a diagnostician. It enables to define the physiological condition of the examined tissues or organs basing on the emission of the infrared radiation. Thermography examination has its application in almost every branch of medicine. For a few years in cardiology, there has been an intensive research on introducing the new methods of identifying the high risk atherosclerotic plaques which is largely based on evaluating the degree of escalation of the inflammation process within the atherosclerotic changes. Thanks to applying thermography within the vessels, it is possible to measure the temperature of the wall of the vessel in order to detect the high risk atherosclerotic plaques and evaluate the potential risk of occurrence of the acute coronary syndrome.