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40 Cards in this Set
- Front
- Back
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in a B mode display the y axis represents
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penetration depth
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the frame rate can be modified by adjusting the
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depth
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which of the following display modes demonstrates the strength of the reflections along the vertical axis
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a mode
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frame rate is determined by depth and
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propagation speed of the medium
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if the line density is increased the frame rate will
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decrease
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propagation spped of a medium limits which of the following penetration depth pixel interpolation harmonic frequencies spatial compounding |
penetration depth
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a prf of 10,000 Hz will demonstrate a maximum penetration depth of
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7-8 cm
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the maximum amount of lines per frame a transducer can employ at a depth of 10 cm when using 30 frames / second and two focal zones is
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128
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which of the following is directly related to PRF line density imaging depth spatial resolution operating frequency |
line density
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increasing the amplitude of the sound beam by 3 dB will
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increase the signal to noise ratio
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Protects the receiver components from the pulse voltage is the |
T/R switch
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output of a diagnostic ultrasound system ranges between just above zero to
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500 V
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which of the following offsets for attenuation of the sound beam amplifier compression demodulation compensation |
compensation
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the knee of the TGC curve represents the |
deepest region attenuation compensation can occur
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Which component of the ultrasound system adjusts the prf with changes in imaging depth
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pulser
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the transmit and receiver switch is part of which of the following instruments
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beam former
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which of the following constitutes a transmission channel
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an independent pulse delay and an element
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processing the received signal is made possible by _________ |
demodulation
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receiver function that decreases noise
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threshold
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allows multiple focal zones and harmonic frequencies
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code excitation
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a cine loop is a ___processing feature
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post
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the binary number of 0110010 corresponds to a decimal number of
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50
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how many shades of grey are in a 6 bit memory
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64
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what is the term used to describe a volume picture element
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voxel
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displays original data is a characteristic of read or write zoom
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read
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the number of frames per second necessary for a real time image to be free of flicker is
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30
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which of the following is most likely related to pixel density
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spatial resolution
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storage of several preceding real time frames describes
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cine loop
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rows of columns of picture elements in a digital image describes a
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digital matrix
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improves contrast resolution
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b-color
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which of the following components increases the number of scan lines read zoom b color persistence write zoom |
write zoom
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artifact that improperly displays a true reflector's location
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range ambiguity
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when doppler gain is set too high which artifact is likely to occur
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mirror image
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decreasing the PRF decreases the likelihood of which artifact
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range ambiguity
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the design of an ultrasound system assumes
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sound travels directly to and from a reflector
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weakening of echos distal to a strongly attenuating structure describes
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shadowing
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enhancement of echo reflections occur distal to a weak or strongly reflecting structure
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weak
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spaces between the active elements of a phased array transducer result in |
the production of grating lobes
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the distance to a reflector is determined by the
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time it takes for an echo to return
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shadowing and enhancement are a result of which type of imaging artifacts
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attenuation
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