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16 Cards in this Set
- Front
- Back
ultrasound
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sound w/frequencies above the limits of human hearing
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piezoelectric effect
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when they observed that certain crystals would expand and contract slightly when placed in an alternating electrical field
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therapeutic ultrasound
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focused high energy ultrasound waves to remove unwanted
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A-mode
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1-D representation of reflected sound waves
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B-mode
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technique used 2-D presentations of echo-producing interfaces
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bistable
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images registered echoes on phosphorus coated oscilloscope screen as dots of light, using a sorage or bistable cathode ray tube
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analog scan converter
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a device in which data are represented by continuously variable meaurable physical quantities such as lenght width voltage or pressure
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gray scale imaging
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a series of shades from white to black the more shades or levels of grapy the more realistically an image can be recorded and displayed especially a scanned photo
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digital scan converters
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stored echoes in digital format
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doppler effect
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frequency to recognize increase or decrease as the source moves toward or way form the transduceer to recognize echo signal from moving reflectors
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cavitation
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the formation fo gas ro vapor filled cavities
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real time imaging
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refers to images produced by automated scanners with sufficient speed to visualize and record moving structures as well stationary echo reflectors
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harmonic imaging
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a quantitative method of characterizing/recording various tissue types revived the old quest for tissue characterization
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3-D imaging
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produces a volume rather than single angle
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4-D- imaging
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numerous images are captured in rapid succession creating a motion video of the target
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M-mode
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presentation of temporal changes in echose in which the depth of echoproducing interfaces is displayed along one axis and time is displayed along second axis also know as motion modulation or time motion mode
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