Which gain will increase the risk of bioeffects? a.
transmit
b. receive
c. gain
d. overall gain - ANSWER-a. transmit
Which of the following is considered the memory of an ultrasound
instrument? a. pulser
b. transducer
c. receiver
d. beam former
e. digital scan converter
f. display monitor - ANSWER-e. digital scan converter
Spectral broadening suggest: a.
laminar flow
b. turbulent flow
c. flow away from the transducer
d. flow towards the transducer - ANSWER-b. turbulent flow
,With pulse wave Doppler axial resolution: - ANSWER-degrades What
color is usually use in color flow Doppler variance map to indicate
turbulent flow? - ANSWER-green
The Doppler wall filter is considered a: - ANSWER-high pass filter
The Nyquist Limit is equal to:
a. propagation speed x frequency
b. propagation speed/ wavelength
c. PRF/2
d. 4xV^2 - ANSWER-c. PRF/2
Multiple echoes, equally spaced originating from a gas bubble is
called:
a. comet tail
b. ring down
c. slice thickness artifact
d. multipath - ANSWER-b. ring down
An increase in red blood cell velocity will_____ the Doppler Shift: a.
increase
b. decrease
c. not change
d. cannot be predicted - ANSWER-a. increase
,The primary advantage of CW Doppler is: a.
range resolution
b. range discrimination
c. range ambiguity
d. range gating
e. absence of sampling rate - ANSWER-e. absence of sampling rate
The range for ultrasound begins: a.
20 Hz
b. 20,000 Hz
c. 2 MHz
d. 15 MHz - ANSWER-b. 20,000 Hz (useful frequency range for clinical
imaging is 2MHz-10MHz)
Which instrument control affects the amplitude (dB) of the outgoing
signal: a. gain
b. receiver gain
c. TGC
d. transmit gain
e. overall gain - ANSWER-d. transmit gain; amplitude can be affected
by the sonographer
Which of the following is used to convert Doppler shift information
into color:
a. high PRF
b. fast Fourier transform
, c. autocorrelation
d. time interval histogram - ANSWER-c. autocorrelation b is incorrect
because fast Fourier transform is the method used to process
conventional Doppler shift information but is too slow a method for
color Doppler
Pulse repetition frequency - ANSWER-Number of pulses that an
ultrasound system transmits into the body each second. Hz. Typically
4-15 KHz. PRF and depth of a view are inversely related: When system
is imaging deeper, the pulse repetition frequency is lower.
Also the number of pulses created each second
The best way to increase the near field length of an ultrasound beam
is to: - ANSWER-increase transducer diameter
The range of frequencies produced by a damped PZT element is
called:
a. fundamental frequencies
b. Q Factor
c. near field
d. bandwith - ANSWER-d. bandwidth
The percentage of time that the ultrasound instrument is emitting
ultrasound is called: a. PRF
b. pulse duration
c. pulse repetition period
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