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22 Cards in this Set
- Front
- Back
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what amplifies all returning echoes irregardless of depth; affects the entire display
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gain
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What increases the strength of the transmitted pulse;affects entire display;affects the MI (mechanical index)?
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transmit gain
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what compensates for attenuation?
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TGC
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What amplifies echoes located vertically on the display?
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LGC
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what places the beam's narrowest portion in the area of interest; improves lateral resolution?
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focus
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What type of resolution is improved using focus?
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lateral resolution
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What alters gray scale;affects dynamic range which is the range of echoes displayed?
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compression
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what is dynamic range?
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the range of echoes displayed; measured in dB
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What improves spatial resolution by allowing more pixels to be applied to a smaller area?
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zoom
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what allows frame averaging?
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persistence
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what increases frame rate?
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decrease imaging depth; decreasing sector width;decrease line density;decrease the number of focuses
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What eliminates side-lobes and grating lobes?
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harmonic imaging
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HARMONICS
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transmits at a low fundamental frequency but processes and displays the second harmonic; it improves lateral resolution
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CINE LOOP
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allows sonographers to capture and display
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VELOCITY SCALE
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allows the sonographer to control the PRF, this increases the nyquist limit.
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NYQUIST LIMIT
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1/2 PRF
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SAMPLE VOLUME
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decrease to reduce spectral broadening , widen to search for slow flow
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WALL FILTER
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eliminates high amplitude (wall motion) low velocity signals;set low for low velocity set high for higher velocity
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LINE DENSITY
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affects frame rate, decreasing line density increases the frame rate
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sound is?
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a vibration
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a sound wave is?
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a mechanical, longitudinal wave
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a longitudinal wave is?
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a wave that is present when the particle motion is parallel to the direction of wave advancement.
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