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ARDMS – SPI EXAM WITH COMPLETE QUESTIONS AND CORRECT ANSWERS RATED A+
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ARDMS – SPI EXAM WITH COMPLETEQUESTIONS AND CORRECT ANSWERS
RATED A+
An increase in red blood cell velocity will_____ the Doppler Shift:
a. increase
b. decrease
c. not change
d. cannot be predicted Correct 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 Correct Answer e. absence of
sampling rate
The range for ultrasound begins:
a. 20 Hz
b. 20,000 Hz
c. 2 MHz
d. 15 MHz Correct 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 Correct 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 Correct 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 Correct 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: Correct 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 Correct 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
d. duty factor Correct Answer d. duty factor; the maximum value
is 1, the minimum is 0
, The unit of duty factor is:
a. Hz
b. mm
c. ms
d. unitless Correct Answer d. unitless
Quality Factor= Fundamental frequency/ bandwidth Correct
Answer This allows doses of different types of radiation to be
compared for their biological effects.
Clinical imaging transducers are: Correct Answer wide
bandwidth; low q factor
Power/area= Correct Answer Intensity
Increasing wavelength will ___________ frequency.
a. increase
b. decrease
c. not change
d. cannot be predicted. Correct Answer b. decrease
All of the following directly affect frame rate except:
a. depth of penetration
b. field of view
c. number of focuses
d. line density
e. beam width Correct Answer e. beam width
A reflection will occur at the boundary of two media if the acoustic
impedences of the two media are:
a. equal
b. different
c. unchanged
d. cannot be predicted Correct Answer b. different
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