Find information about ultrasonography or ultrasound from Cleveland Clinic, including procedure details, what to expect, associated risks, and more. Medical ultrasonography (sonography) is an ultrasound-based diagnostic imaging technique used to visualize muscles and internal organs, their size, structure. 1: Endosonography Ultrasonography of internal organs using an ultrasound transducer sometimes mounted on a fiberoptic endoscope. In endosonography the.
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In medical ultrasonography, the moving objects are red blood cells ultrasonography the blood. Thus, Doppler ultrasonography can be used to evaluate Whether blood is flowing through blood vessels How fast it flows Which direction it flows in Doppler ultrasonography is used To evaluate how well the heart is functioning as part of echocardiography To detect blocked blood vessels, ultrasonography in leg veins, as in deep vein thrombosis, when veins are blocked by a blood clot To detect narrowed arteries, especially the carotid arteries in the neck, which carry blood to the brain Spectral Doppler ultrasonography This procedure shows blood flow information as a graph.
Ultrasonography can be used to assess how much of a blood vessel is ultrasonography. Duplex Doppler ultrasonography This procedure combines spectral and B-mode ultrasonography.
Color Doppler ultrasonography For this test, color is superimposed on the shades-of-gray ultrasonography of blood flow produced by Doppler ultrasonography. The color indicates direction of ultrasonography flow.
Ultrasonography Test (Ob/Gyn)
ultrasonography Red may be used ultrasonography indicate flow toward the transducer, and blue may be used to indicate flow away from the transducer. The brightness of the color indicates how fast the blood is flowing.
Color Doppler ultrasonography can help assess the risk of stroke because it helps doctors identify and evaluate narrowing or blockage of arteries in the neck and head.
The procedure is useful ultrasonography evaluating people who have had a transient ischemic attack or stroke and people who have risk factors for ultrasonography but no symptoms.
Color Doppler ultrasonography is also used to assess blood flow to internal organs and tumors.
Basic Principles of Ultrasonography
Ultrasound is used to create images of soft tissue structures, such ultrasonography the gall bladder, liver, heart, kidney, female reproductive organs-- and even of babies still in the womb. Ultrasound can also detect blockages ultrasonography the blood vessels.
An audiovisual-electronic interface ultrasonography the detected or processed echo signals, which pass through the electronics of the instrument, into a form that the technologist can evaluate. The "endo-" of ultrasonography refers to the examination of tissue within hollow organs, with reference to the usual ultrasonography procedure which is performed externally or transcutaneously.
Ultrasonography, Doppler, Pulsed Ultrasonography applying the Doppler effect, with velocity detection combined with range discrimination.
Ultrasonography & Pelvic Ultrasound | Cleveland Clinic
Ultrasonography bursts of ultrasound are transmitted at regular intervals and the echoes are demodulated as they return. Ultrasonography, Doppler, Duplex Ultrasonography applying the Doppler effect combined with real-time imaging.
Ultrasonography real-time image is created by rapid movement of the ultrasound beam. Scattering increases with higher-frequency transducers, thus providing better detail ultrasonography resolution.
Absorption occurs when the energy of the ultrasound beam is converted to heat. This occurs at the ultrasonography level as the beam passes through the tissues.
The change in tissue density produces a change in velocity, and this change in velocity causes the beam to bend, or refract. Display Modes Information generated from an ultrasound examination can be displayed in a variety of ways, called modes.
The mode used for display depends on the type of ultrasound unit used, the information to be obtained, and the organ being examined. A Amplitude Mode In A mode, the returning echoes are displayed on the monitor as spikes originating from a single vertical or horizontal baseline.
The height of the spike correlates to the amplitude of the echo. This mode is not frequently used other than in ophthalmology.
B Brightness Mode In B mode, echoes are represented by dots on a line that form the basis of a two-dimensional image. Its location relative to the transducer is displayed along the vertical axis of the monitor, with the top of the monitor representing the transducer.
The returning echo's location along the axis is based on the amount of time it takes for the ultrasound wave to be transmitted from the transducer and reflected back. Echoes arising from structures in the near field close to the transducer take less time than those coming from the far field farther away ultrasonography the transducer because they travel a shorter distance.
Real-time B mode ultrasonography allows a complete, two-dimensional, cross-sectional image to be generated by using multiple B-mode lines.