ULTRASOUND PHYSICS - MOCK EXAM
QUESTIONS FOR SPI WITH COMPLETE
ANSWERS KEY NEW 2026-2027 UPDATE
78 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Apply wave propagation, attenuation, and acoustic impedance concepts to predict ultrasound beam
behavior and image formation
2 Analyze Doppler spectral waveforms and color flow artifacts to derive hemodynamic information and
identify technical pitfalls
3 Evaluate transducer selection, system settings, and quality assurance metrics to optimize image quality
and ensure diagnostic accuracy
4 Ultrasound Physics
5 Mock Exam Questions for SPI with Complete Answers Key New 2026
6 2027 Update
7 Foundations of Ultrasound Physics and Instrumentation
8 Applied Ultrasound Physics and Instrumentation
9 Advanced Ultrasound Physics and Instrumentation
10 Ultrasound Physics and Instrumentation Review
ABSTRACT
This study document brings together 78 carefully worded exam questions drawn from Ultrasound
Physics - Mock Exam Questions for SPI with Complete Answers Key New 2026-2027 Update, with
the strongest emphasis placed on Apply wave propagation, attenuation, and acoustic impedance
concepts to predict ultrasound beam behavior and image formation, Analyze Doppler spectral
waveforms and color flow artifacts to derive hemodynamic information and identify technical
pitfalls, Evaluate transducer selection, system settings and and quality assurance metrics to
optimize image quality and ensure diagnostic accuracy. Every item follows the wording style and
level of reasoning you meet in the real paper, and each one is paired with a clear rationale so the
correct choice is never a guess. Work through the set at your own pace, mark the questions that
slow you down, then come back to them until the reasoning feels automatic. Learners who revise
this way walk into the exam room recognising the pattern behind the questions instead of meeting
them for the first time. Keep going - steady, honest practice is what turns a difficult paper into a
comfortable pass.
Page 1
,Q1 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A linear array transducer with a 5 MHz center frequency and a 0.4 mm element
pitch is used for imaging. If the beam is steered to 45 degrees, what is the
approximate grating lobe level relative to the main lobe?
A. -26 dB
B. -13 dB CORRECT
C. -40 dB
D. 0 dB
RATIONALE: Grating lobe level is determined by the element pitch relative to wavelength. At 5
MHz in soft tissue ( 0.31 mm), pitch/ 1.29. Grating lobes reach significant levels when pitch > .
The formula 20 log10(sin((pitch/ - 1))/ ((pitch/ - 1))) yields approximately -13 dB for this ratio. The
other values do not match the calculated level for the given parameters.
Q2 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
During a color Doppler exam of the carotid bifurcation, aliasing is observed in the
internal carotid artery. Which of the following parameter adjustments will most
effectively reduce aliasing while maintaining diagnostic accuracy?
A. Increase the color gain
B. Decrease the packet size
C. Increase the pulse repetition frequency (PRF) CORRECT
D. Decrease the wall filter
RATIONALE: Aliasing occurs when the Doppler shift exceeds half the PRF (Nyquist limit).
Increasing PRF raises the Nyquist limit, reducing aliasing. Increasing gain worsens aliasing,
decreasing packet size affects temporal resolution but not Nyquist limit, and decreasing wall filter
may increase noise but does not directly address aliasing.
Page 2
,Q3 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A quality assurance test using a tissue-equivalent phantom reveals that the
measured axial resolution at 7 MHz is 0.5 mm. What is the pulse duration (in
microseconds) if the speed of sound in the phantom is 1540 m/s?
A. 0.65 µs CORRECT
B. 0.32 µs
C. 1.0 µs
D. 0.5 µs
RATIONALE: Axial resolution = (pulse duration × speed of sound) / 2. Rearranging: pulse
duration = (2 × axial resolution) / speed = (2 × 0.5 mm) / 1540 m/s = 1 mm / 1540 m/s 0.649 µs.
The other options result from misapplication of the formula or incorrect unit conversions.
Q4 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A patient with a mechanical mitral valve undergoes a transthoracic
echocardiogram. The Nyquist limit is set to 60 cm/s. The peak velocity across the
valve is 250 cm/s. Which of the following artifacts is most likely to be observed on
the spectral Doppler display?
A. Mirror image
B. Aliasing CORRECT
C. Range ambiguity
D. Speed error
RATIONALE: Aliasing occurs when the Doppler shift exceeds the Nyquist limit (PRF/2). Here, the
peak velocity (250 cm/s) is well above the Nyquist limit (60 cm/s). Mirror image is an artifact from
strong reflectors, range ambiguity from high PRF, and speed error from incorrect propagation
speed assumption.
Page 3
, Q5 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
When using a 1.5D array transducer, which of the following best describes the
primary advantage over a conventional 1D array?
A. Improved elevation resolution CORRECT
B. Increased frame rate
C. Reduced grating lobes
D. Enhanced axial resolution
RATIONALE: A 1.5D array has multiple rows of elements in the elevation direction, allowing
electronic focusing in the elevation plane, which improves slice thickness (elevation resolution).
Frame rate is not directly increased, grating lobes are related to element pitch in the lateral
direction, and axial resolution depends on pulse duration.
Q6 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A spectral Doppler waveform of the hepatic vein shows a pulsatile pattern with
reversed flow during systole. Which of the following physiological parameters is
most directly responsible for this waveform?
A. Right atrial pressure CORRECT
B. Portal venous flow
C. Hepatic artery resistance
D. Inferior vena cava compliance
RATIONALE: Hepatic vein Doppler reflects right atrial pressure changes during the cardiac cycle.
Reversed flow during systole indicates elevated right atrial pressure or tricuspid regurgitation.
Portal venous flow, hepatic artery resistance, and IVC compliance influence other aspects but
are not the primary determinant of the systolic reversal.
Page 4
QUESTIONS FOR SPI WITH COMPLETE
ANSWERS KEY NEW 2026-2027 UPDATE
78 QUESTIONS
TABLE OF CONTENTS
# TOPIC
1 Apply wave propagation, attenuation, and acoustic impedance concepts to predict ultrasound beam
behavior and image formation
2 Analyze Doppler spectral waveforms and color flow artifacts to derive hemodynamic information and
identify technical pitfalls
3 Evaluate transducer selection, system settings, and quality assurance metrics to optimize image quality
and ensure diagnostic accuracy
4 Ultrasound Physics
5 Mock Exam Questions for SPI with Complete Answers Key New 2026
6 2027 Update
7 Foundations of Ultrasound Physics and Instrumentation
8 Applied Ultrasound Physics and Instrumentation
9 Advanced Ultrasound Physics and Instrumentation
10 Ultrasound Physics and Instrumentation Review
ABSTRACT
This study document brings together 78 carefully worded exam questions drawn from Ultrasound
Physics - Mock Exam Questions for SPI with Complete Answers Key New 2026-2027 Update, with
the strongest emphasis placed on Apply wave propagation, attenuation, and acoustic impedance
concepts to predict ultrasound beam behavior and image formation, Analyze Doppler spectral
waveforms and color flow artifacts to derive hemodynamic information and identify technical
pitfalls, Evaluate transducer selection, system settings and and quality assurance metrics to
optimize image quality and ensure diagnostic accuracy. Every item follows the wording style and
level of reasoning you meet in the real paper, and each one is paired with a clear rationale so the
correct choice is never a guess. Work through the set at your own pace, mark the questions that
slow you down, then come back to them until the reasoning feels automatic. Learners who revise
this way walk into the exam room recognising the pattern behind the questions instead of meeting
them for the first time. Keep going - steady, honest practice is what turns a difficult paper into a
comfortable pass.
Page 1
,Q1 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A linear array transducer with a 5 MHz center frequency and a 0.4 mm element
pitch is used for imaging. If the beam is steered to 45 degrees, what is the
approximate grating lobe level relative to the main lobe?
A. -26 dB
B. -13 dB CORRECT
C. -40 dB
D. 0 dB
RATIONALE: Grating lobe level is determined by the element pitch relative to wavelength. At 5
MHz in soft tissue ( 0.31 mm), pitch/ 1.29. Grating lobes reach significant levels when pitch > .
The formula 20 log10(sin((pitch/ - 1))/ ((pitch/ - 1))) yields approximately -13 dB for this ratio. The
other values do not match the calculated level for the given parameters.
Q2 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
During a color Doppler exam of the carotid bifurcation, aliasing is observed in the
internal carotid artery. Which of the following parameter adjustments will most
effectively reduce aliasing while maintaining diagnostic accuracy?
A. Increase the color gain
B. Decrease the packet size
C. Increase the pulse repetition frequency (PRF) CORRECT
D. Decrease the wall filter
RATIONALE: Aliasing occurs when the Doppler shift exceeds half the PRF (Nyquist limit).
Increasing PRF raises the Nyquist limit, reducing aliasing. Increasing gain worsens aliasing,
decreasing packet size affects temporal resolution but not Nyquist limit, and decreasing wall filter
may increase noise but does not directly address aliasing.
Page 2
,Q3 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A quality assurance test using a tissue-equivalent phantom reveals that the
measured axial resolution at 7 MHz is 0.5 mm. What is the pulse duration (in
microseconds) if the speed of sound in the phantom is 1540 m/s?
A. 0.65 µs CORRECT
B. 0.32 µs
C. 1.0 µs
D. 0.5 µs
RATIONALE: Axial resolution = (pulse duration × speed of sound) / 2. Rearranging: pulse
duration = (2 × axial resolution) / speed = (2 × 0.5 mm) / 1540 m/s = 1 mm / 1540 m/s 0.649 µs.
The other options result from misapplication of the formula or incorrect unit conversions.
Q4 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A patient with a mechanical mitral valve undergoes a transthoracic
echocardiogram. The Nyquist limit is set to 60 cm/s. The peak velocity across the
valve is 250 cm/s. Which of the following artifacts is most likely to be observed on
the spectral Doppler display?
A. Mirror image
B. Aliasing CORRECT
C. Range ambiguity
D. Speed error
RATIONALE: Aliasing occurs when the Doppler shift exceeds the Nyquist limit (PRF/2). Here, the
peak velocity (250 cm/s) is well above the Nyquist limit (60 cm/s). Mirror image is an artifact from
strong reflectors, range ambiguity from high PRF, and speed error from incorrect propagation
speed assumption.
Page 3
, Q5 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
When using a 1.5D array transducer, which of the following best describes the
primary advantage over a conventional 1D array?
A. Improved elevation resolution CORRECT
B. Increased frame rate
C. Reduced grating lobes
D. Enhanced axial resolution
RATIONALE: A 1.5D array has multiple rows of elements in the elevation direction, allowing
electronic focusing in the elevation plane, which improves slice thickness (elevation resolution).
Frame rate is not directly increased, grating lobes are related to element pitch in the lateral
direction, and axial resolution depends on pulse duration.
Q6 APPLY WAVE PROPAGATION, ATTENUATION, AND ACOUSTIC IMPEDANCE CONCEPTS
TO PREDICT ULTRASOUND BEAM BEHAVIOR AND IMAGE FORMATION
A spectral Doppler waveform of the hepatic vein shows a pulsatile pattern with
reversed flow during systole. Which of the following physiological parameters is
most directly responsible for this waveform?
A. Right atrial pressure CORRECT
B. Portal venous flow
C. Hepatic artery resistance
D. Inferior vena cava compliance
RATIONALE: Hepatic vein Doppler reflects right atrial pressure changes during the cardiac cycle.
Reversed flow during systole indicates elevated right atrial pressure or tricuspid regurgitation.
Portal venous flow, hepatic artery resistance, and IVC compliance influence other aspects but
are not the primary determinant of the systolic reversal.
Page 4
