ARDMS SPI EXAM QUESTIONS AND
ANSWERS UPDATED (2024/2025)
(VERIFIED ANSWERS)
Which instrument control affects the amplitude (dB) of the outgoing signal:
a. gain
b. receiver gain
c. TGC
d. transmit gain
e. overall gain - ANS ✓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 - ANS ✓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 - ANS ✓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
ARDMS SPI
, 2
ARDMS
The best way to increase the near field length of an ultrasound beam is to: -
ANS ✓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 - ANS ✓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 - ANS ✓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 - ANS ✓d. unitless
Quality Factor= Fundamental frequency/ bandwidth - ANS ✓This allows
doses of different types of radiation to be compared for their biological effects.
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