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Technologists who assist physicians in the diagnosis and treatment of heart disease are known as cardiovascular technologists. (Cardio means heart; vascular refers to the blood vessel/circulatory system.) Increasingly, hospitals are centralizing cardiovascular services under one full cardiovascular "service line" overseen by the same administrator. In addition to cardiovascular technologists, the cardiovascular team at a hospital may include radiology (X-ray) technologists, nuclear medicine technologists, nurses, physician assistants, respiratory technicians, and respiratory therapists. Cardiovascular technologists contribute by performing one or more of a wide range of procedures in cardiovascular medicine, including invasive (enters a body cavity or interrupts normal body functions), noninvasive, peripheral vascular, or echocardiography (ultrasound) procedures. In most facilities, technologists use equipment that is among the most advanced in the medical field; drug therapies also may be used as part of the diagnostic imaging procedures or in addition to them. Technologists' services may be required when the patient's condition is first being explored, before surgery, during surgery (which primarily involves cardiology technologists), or during rehabilitation of the patient. Some of the work is performed on an outpatient basis.