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Cards In This Set
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Acoustic attenuation
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Weakening of the sound beam as it passes through different structures within the human body
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Anechoic
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Sonolucent; to be free of echoes
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Selective amplification of returning echoes from a given depth
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Time gain compensation
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Unit of frequency
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Hertz; Hz
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Distance along the sound path from the point of entry to the point of interest
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Depth
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Opposition that a material offers to the passage of a sound wave
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Acoustic impedance
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An echo feature that does not correspond to the anatomy being imaged
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Artifact
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Focal zone
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Area of the sound beam that creates an image with the best resolution; at the focus (narrowest point of beam)
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Transducer
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Converts one form of energy to another; converts electrical to mechanical and vice versa
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Hypoechoic
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An area seen on an image where the echoes appear "darker" than the echoes of adjacent structures
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The distance a sound wave travels in one cycle
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Acoustic wavelength
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Fraunhofer zone
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Far field; area of beam beyond the focus
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Hyperechoic
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An area seen on an image where the echoes appear "brighter" than adjacent structures
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Echogenic
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Capable of producing echoes
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Contrast
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Difference in the brightness of echoes
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