(1) DOPPLER ULTRASOUND - An instrument that uses ultrasound (sound waves at extremely high frequencies) to produce images of the heart and major blood vessels non-invasively (without breaking the skin).
(2) Echocardiogram is a test that uses sound waves to create a moving picture of the heart. The picture is much more detailed than X-ray image and involves no radiation exposure. This test is performed to evaluate the valves and chambers of the heart in a noninvasive manner. The echocardiogram allows doctors to evaluate heart murmurs, check the pumping function of the heart, and evaluate patients who have had heart attacks. It is a very good screening test for heart disease in certain groups of patients.
color Doppler echocardiography - color flow Doppler imaging.
contrast echocardiography - that in which the ultrasonic beam detects tiny bubbles produced by intravascular injection of a liquid or a small amount of carbon dioxide gas.
Doppler echocardiography - a technique for recording the flow of red blood cells through the cardiovascular system by means of Doppler ultrasonography, either continuous wave or pulsed wave.
M-mode echocardiography - that recording the amplitude and rate of motion (M) in real time, yielding a monodimensional (?icepick?) view of the heart.
transesophageal echocardiography - (TEE) the introduction of a transducer attached to a fiberoptic endoscope into the esophagus to provide two-dimensional cardiographic images or Doppler information.
recording of the position and motion of the heart walls or internal structures of the heart and neighboring tissue by the echo obtained from beams of ultrasonic waves directed through the chest wall. Echocardiography is based on the same principle as the oceanographic technique of depth-sounding; that is, it utilizes ultrasound to delineate anatomical structures by recording on a graph the echoes from the heart structures. It is particularly useful in demonstrating, without danger to the patient, valvular and other structural deformities of the heart which formerly required cardiac catheterization or some other elaborate procedure for accurate diagnosis. See also ultrasonography.