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ARDMS SPI Exam |Perfectly
Revised Questions And Verified
Answers 2026
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.
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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
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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
ARDMS SPI Exam |Perfectly
Revised Questions And Verified
Answers 2026
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.
,2|Page
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
, 3|Page
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
