SPI Practice Test 2025 With Correct
Answers
Which of the following do the source and the medium determine?
d d d d d d d d d d
a. duty factor
d d
b. frequency
d
c. propagation speed
d d
d. axial resolution - correct answer d.
d d d d d d
Axial resolution is affected by all of the following EXCEPT
d d d d d d d d d
a. frequency
d
b. damping
d
c. spatial pulse length
d d d
d. focusing - correct answer d.
d d d d d
Damping in a transducer d d d
a. reduces the number of cycles in a pulse and increases the quality factor
d d d d d d d d d d d d d
,b. increases the number of cycles in a pulse and increases penetration
d d d d d d d d d d d
c. causes poor axial and lateral resolution
d d d d d d
d. reduces the duty factor and increases the range of transmitted frequencies - correct answer d.
d d d d d d d d d d d d d d d
Far zone beam divergence can be reduced on a single-element transducer by using
d d d d d d d d d d d d
a. a transducer with a smaller element diameter
d d d d d d d
b. a higher frequency transducer
d d d d
c. a lower frequency transducer or a smaller element diameter
d d d d d d d d d
d. adjustable focusing - correct answer b.
d d d d d d
The area between the face of an unfocused single-element transducer and the point where the beam starts to
d d d d d d d d d d d d d d d d d d
diverge is the d d
a. Fraunhofer zone
d d
b. refraction zone
d d
c. focal zone
d d
d. near zone - correct answer d.
d d d d d d
Assuming a fixed frequency, what happens if the diameter of an unfocused transducer is increased?
d d d d d d d d d d d d d d
a. the far zone divergence increases
d d d d d
b. the penetration decreases
d d d
c. the length of the near zone increases
d d d d d d d
d. the length of the near zone decreases - correct answer c.
d d d d d d d d d d d
Which of the following does NOT affect lateral resolution?
d d d d d d d d
a. focusing
d
,b. element diameter
d d
c. frequency
d
d. bandwidth - correct answer d.
d d d d d
Higher frequency transducers provide
d d d
a. improved lateral resolution
d d d
b. smaller Doppler shifts
d d d
c. improved axial resolution and reduced attenuation
d d d d d d
d. increased penetration - correct answer a.
d d d d d d
Ultrasound waves that are traveling through a medium consist of
d d d d d d d d d
a. electromagnetic and radio frequencies
d d d d
b. compressions and refractions
d d d
c. electromagnetic and ionizing frequencies
d d d d
d. compressions and rarefactions - correct answer d.
d d d d d d d
What is the difference between audible sound and ultrasound?
d d d d d d d d
a. audible sound waves can travel through a vacuum
d d d d d d d d
b. audible sound has a higher frequency
d d d d d d
c. ultrasound has a higher frequency
d d d d d
d. ultrasound waves are ionizing - correct answer c.
d d d d d d d d
A decrease in the thickness of a piezoelectric element will result in
d d d d d d d d d d d
a. a greater pulse duration
d d d d
b. an increase in the propagation speed
d d d d d d
, c. a decrease in the quality factor if the bandwidth decreases
d d d d d d d d d d
d. an increase in the frequency of the transducer - correct answer d.
d d d d d d d d d d d d
The resonant frequency of a pulsed-wave ultrasound transducer is dependent on
d d d d d d d d d d
a. damping
d
b. the backing material
d d d
c. the thickness of the piezoelectric element and the speed of sound through the piezoelectric element
d d d d d d d d d d d d d d d
d. the amplitude of the voltage applied to the piezoelectric element - correct answer c.
d d d d d d d d d d d d d d
The image is brighter at the level of the focal zone. Which of the following controls is best to correct this?
d d d d d d d d d d d d d d d d d d d d
a. overall gain
d d
b. TGC d
c. acoustic power
d d
d. PRF - correct answer b.
d d d d d
If the frequency is doubled,
d d d d
a. the duty factor will increase
d d d d d
b. the period will double
d d d d
c. the wavelength will double
d d d d
d. the wavelength will be one-half - correct answer d.
d d d d d d d d d
The typical range of pulse repetition frequencies in a pulse-echo ultrasound system is
d d d d d d d d d d d d
a. 2,000 Hz to 20,000 Hz
d d d d d
b. 20 MHz to 200 MHz
d d d d d
c. 20,000 Hz to 200,000 Hz
d d d d d
Answers
Which of the following do the source and the medium determine?
d d d d d d d d d d
a. duty factor
d d
b. frequency
d
c. propagation speed
d d
d. axial resolution - correct answer d.
d d d d d d
Axial resolution is affected by all of the following EXCEPT
d d d d d d d d d
a. frequency
d
b. damping
d
c. spatial pulse length
d d d
d. focusing - correct answer d.
d d d d d
Damping in a transducer d d d
a. reduces the number of cycles in a pulse and increases the quality factor
d d d d d d d d d d d d d
,b. increases the number of cycles in a pulse and increases penetration
d d d d d d d d d d d
c. causes poor axial and lateral resolution
d d d d d d
d. reduces the duty factor and increases the range of transmitted frequencies - correct answer d.
d d d d d d d d d d d d d d d
Far zone beam divergence can be reduced on a single-element transducer by using
d d d d d d d d d d d d
a. a transducer with a smaller element diameter
d d d d d d d
b. a higher frequency transducer
d d d d
c. a lower frequency transducer or a smaller element diameter
d d d d d d d d d
d. adjustable focusing - correct answer b.
d d d d d d
The area between the face of an unfocused single-element transducer and the point where the beam starts to
d d d d d d d d d d d d d d d d d d
diverge is the d d
a. Fraunhofer zone
d d
b. refraction zone
d d
c. focal zone
d d
d. near zone - correct answer d.
d d d d d d
Assuming a fixed frequency, what happens if the diameter of an unfocused transducer is increased?
d d d d d d d d d d d d d d
a. the far zone divergence increases
d d d d d
b. the penetration decreases
d d d
c. the length of the near zone increases
d d d d d d d
d. the length of the near zone decreases - correct answer c.
d d d d d d d d d d d
Which of the following does NOT affect lateral resolution?
d d d d d d d d
a. focusing
d
,b. element diameter
d d
c. frequency
d
d. bandwidth - correct answer d.
d d d d d
Higher frequency transducers provide
d d d
a. improved lateral resolution
d d d
b. smaller Doppler shifts
d d d
c. improved axial resolution and reduced attenuation
d d d d d d
d. increased penetration - correct answer a.
d d d d d d
Ultrasound waves that are traveling through a medium consist of
d d d d d d d d d
a. electromagnetic and radio frequencies
d d d d
b. compressions and refractions
d d d
c. electromagnetic and ionizing frequencies
d d d d
d. compressions and rarefactions - correct answer d.
d d d d d d d
What is the difference between audible sound and ultrasound?
d d d d d d d d
a. audible sound waves can travel through a vacuum
d d d d d d d d
b. audible sound has a higher frequency
d d d d d d
c. ultrasound has a higher frequency
d d d d d
d. ultrasound waves are ionizing - correct answer c.
d d d d d d d d
A decrease in the thickness of a piezoelectric element will result in
d d d d d d d d d d d
a. a greater pulse duration
d d d d
b. an increase in the propagation speed
d d d d d d
, c. a decrease in the quality factor if the bandwidth decreases
d d d d d d d d d d
d. an increase in the frequency of the transducer - correct answer d.
d d d d d d d d d d d d
The resonant frequency of a pulsed-wave ultrasound transducer is dependent on
d d d d d d d d d d
a. damping
d
b. the backing material
d d d
c. the thickness of the piezoelectric element and the speed of sound through the piezoelectric element
d d d d d d d d d d d d d d d
d. the amplitude of the voltage applied to the piezoelectric element - correct answer c.
d d d d d d d d d d d d d d
The image is brighter at the level of the focal zone. Which of the following controls is best to correct this?
d d d d d d d d d d d d d d d d d d d d
a. overall gain
d d
b. TGC d
c. acoustic power
d d
d. PRF - correct answer b.
d d d d d
If the frequency is doubled,
d d d d
a. the duty factor will increase
d d d d d
b. the period will double
d d d d
c. the wavelength will double
d d d d
d. the wavelength will be one-half - correct answer d.
d d d d d d d d d
The typical range of pulse repetition frequencies in a pulse-echo ultrasound system is
d d d d d d d d d d d d
a. 2,000 Hz to 20,000 Hz
d d d d d
b. 20 MHz to 200 MHz
d d d d d
c. 20,000 Hz to 200,000 Hz
d d d d d
