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16 Cards in this Set

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