ARDMS SPI Exam Version A 2025 – Complete Questions and Answers (Ultrasound Physics Exam Study Material)

ARDMS SPI EXAM VERSION A 2025
QUESTIONS AND 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 - 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


Which gain will increase the risk of bioeffects?
a. transmit
b. receive
c. gain