1 ARDMS
ARDMS SPI EXAM QUESTIONS AND
ANSWERS UPDATED (2024/2025)
(VERIFIED ANSWERS)
Which instrument control affects the amplitude (dB) of the outgoing signal:
- gain
- receiver gain
- TGC
- transmit gain
- 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:
- high PRF
- fast Fourier transform
- autocorrelation
- 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 1 / 2
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:
- fundamental frequencies
- Q Factor
- near field
- bandwith - ANS ✓d. bandwidth
The percentage of time that the ultrasound instrument is emitting
ultrasound is called:
- PRF
- pulse duration
- pulse repetition period
- duty factor - ANS ✓d. duty factor; the maximum value is 1, the minimum is 0
The unit of duty factor is:
- Hz
- mm
- ms
- 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.
Clinical imaging transducers are: - ANS ✓wide bandwidth; low q factor
Power/area= - ANS ✓Intensity ARDMS SPI
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