1|Page
SPI EXAM NEWEST 2026/2027 COMPLETE ALL
QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||NEWEST EXAM!!!
73. Focusing
a. Improves axial resolution
b. Improves lateral resolution
c. Increases beam width in the focal zone
d. Increases duty factor - ANSWER-B. Focusing improves
lateral resolution and decreases beam width
74. The term rarefaction describes a zone of __________
in the medium traversed by the wave.
a. increased velocity
b. decreased pressure
c. decreased flow
d. increased amplitude - ANSWER-B. A rarefaction is an
area of decreased pressure
75. A longitudinal wave is characterized by __________.
a. the ability of the sound wave to penetrate 5 cm of tissue
,2|Page
b. frequency of vibration greater than 1 MHz
c. acoustic velocity equals 1,540 m/s
d. particle motion in same direction as the direction of
wave propagation - ANSWER-D. A longitudinal wave has
particle motion parallel to the path of the beam
6. Which prefix equals 10^-3?
a. micro-
b. milli-
c. centi-
d. mega- - ANSWER-B. 10^-3 is 1/1000 or .001 and is
one-thousandth, or milli-
77. Which of the following is a characteristic(s) of non-
specular reflectors?
a. they provide the internal texture of organs in B-mode
imaging
b. they occur at interfaces with large dimensions relative to
the wavelength
c. they are highly angle dependent
,3|Page
d. they never return sound energy back to the transducer -
ANSWER-A. Non-specular reflectors provide for the
imaging or parenchyma
78. Relative sound intensity based on a logarithmic scale
is expressed typically in units of:
a. rayl
b. decibel
c. Hertz
d. Curie - ANSWER-B. The decibel is the unit used to
compare two intensities, and is on a logarithmic scale
79. Pulsed-wave operation is necessary for B-mode
imaging because:
a. the transducer becomes too hot to handle if continuous
wave is used
b. the crystal would break with continuously produced
sound waves
c. the depth to the reflector can be determined
d. improved temporal resolution - ANSWER-C. Pulsed-
wave operation allows us to measure the time to the
reflector, and therefore determine its depth
, 4|Page
69. Which of the following has time represented on the X-
axis?
a. B mode
b. X-mode
c. M mode
d. A mode - ANSWER-C. M-Mode has depth on the y-axis
and time on the x-axis
70. Which of the following produces a rectangular format?
a. curvilinear sequenced array
b. convex array
c. phased array
d. linear sequenced array - ANSWER-D. Of the probes
listed, only the linear sequenced array produces a
rectangular image
71. The piezoelectric effect describes how _______ is
converted into ________ by a ________.
a. electricity, image, display
b. ultrasound, heat, tissue
c. incident sound, reflected sound, boundary
SPI EXAM NEWEST 2026/2027 COMPLETE ALL
QUESTIONS AND CORRECT DETAILED ANSWERS
WITH RATIONALES (VERIFIED ANSWERS) |ALREADY
GRADED A+||NEWEST EXAM!!!
73. Focusing
a. Improves axial resolution
b. Improves lateral resolution
c. Increases beam width in the focal zone
d. Increases duty factor - ANSWER-B. Focusing improves
lateral resolution and decreases beam width
74. The term rarefaction describes a zone of __________
in the medium traversed by the wave.
a. increased velocity
b. decreased pressure
c. decreased flow
d. increased amplitude - ANSWER-B. A rarefaction is an
area of decreased pressure
75. A longitudinal wave is characterized by __________.
a. the ability of the sound wave to penetrate 5 cm of tissue
,2|Page
b. frequency of vibration greater than 1 MHz
c. acoustic velocity equals 1,540 m/s
d. particle motion in same direction as the direction of
wave propagation - ANSWER-D. A longitudinal wave has
particle motion parallel to the path of the beam
6. Which prefix equals 10^-3?
a. micro-
b. milli-
c. centi-
d. mega- - ANSWER-B. 10^-3 is 1/1000 or .001 and is
one-thousandth, or milli-
77. Which of the following is a characteristic(s) of non-
specular reflectors?
a. they provide the internal texture of organs in B-mode
imaging
b. they occur at interfaces with large dimensions relative to
the wavelength
c. they are highly angle dependent
,3|Page
d. they never return sound energy back to the transducer -
ANSWER-A. Non-specular reflectors provide for the
imaging or parenchyma
78. Relative sound intensity based on a logarithmic scale
is expressed typically in units of:
a. rayl
b. decibel
c. Hertz
d. Curie - ANSWER-B. The decibel is the unit used to
compare two intensities, and is on a logarithmic scale
79. Pulsed-wave operation is necessary for B-mode
imaging because:
a. the transducer becomes too hot to handle if continuous
wave is used
b. the crystal would break with continuously produced
sound waves
c. the depth to the reflector can be determined
d. improved temporal resolution - ANSWER-C. Pulsed-
wave operation allows us to measure the time to the
reflector, and therefore determine its depth
, 4|Page
69. Which of the following has time represented on the X-
axis?
a. B mode
b. X-mode
c. M mode
d. A mode - ANSWER-C. M-Mode has depth on the y-axis
and time on the x-axis
70. Which of the following produces a rectangular format?
a. curvilinear sequenced array
b. convex array
c. phased array
d. linear sequenced array - ANSWER-D. Of the probes
listed, only the linear sequenced array produces a
rectangular image
71. The piezoelectric effect describes how _______ is
converted into ________ by a ________.
a. electricity, image, display
b. ultrasound, heat, tissue
c. incident sound, reflected sound, boundary
