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ARDMS Sonography Principles and Instrumentation Sample Questions (Q70-Q75):

NEW QUESTION # 70
Which artifact is caused by defects in the crystals of the transducer?

A. Side lobe
B. Mirror image
C. Ringdown
D. Dropout

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Defects in transducer crystals result in missing or weakened signals along the beam path produced by those elements, creating dropout. In array transducers, dropout typically appears as vertical or horizontal dark zones depending on which elements are affected.
According to sonography instrumentation reference:
"Crystal failure results in areas of signal dropout directly beneath the defective elements due to loss of transmitted or received signals." Therefore, the correct answer is D: Dropout.
-

NEW QUESTION # 71
Which color control was adjusted in color bar A to produce color bar B?

A. Scale
B. Map
C. Invert
D. Baseline

Answer: A

Explanation:
The color bar on a Doppler ultrasound display indicates the range of velocities that the system can detect and display. In color bar A, the scale is set to a higher maximum velocity (64 cm/s), while in color bar B, the scale is set to a lower maximum velocity (16 cm/s). Adjusting the scale (or velocity range) changes the upper and lower limits of the velocities displayed, which affects the sensitivity of the Doppler system to detect flow velocities. Lowering the scale allows for better visualization of lower velocities, but it may also increase the likelihood of aliasing for higher velocities.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.

NEW QUESTION # 72
Which change improves temporal resolution during color flow imaging?

A. Increase field of view
B. Decrease transmit frequency
C. Decrease packet size
D. Increase line density

Answer: C

Explanation:
Temporal resolution is improved by increasing the frame rate. One way to increase the frame rate is by decreasing the packet size (also known as ensemble length) in color Doppler imaging. The packet size refers to the number of pulses used to determine the Doppler shift at each location. A smaller packet size means fewer pulses are required, which allows for quicker data acquisition and thus a higher frame rate. Increasing the field of view, decreasing transmit frequency, and increasing line density would all decrease the frame rate and thus degrade temporal resolution.
References:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.

NEW QUESTION # 73
For harmonic imaging, what must the overall transducer bandwidth contain?

A. Fundamental and fourth harmonic frequencies
B. Fundamental and odd harmonic frequencies
C. Fundamental and even harmonic frequencies
D. Fundamental and second harmonic frequencies

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Harmonic imaging operates by transmitting at the fundamental frequency and receiving echoes at the second harmonic frequency (which is twice the fundamental frequency). Therefore, the transducer must have a broad enough bandwidth to include both frequencies.
According to sonography instrumentation reference:
"For harmonic imaging, the transducer bandwidth must accommodate both the transmitted fundamental frequency and the received second harmonic frequency." Therefore, the correct answer is A: Fundamental and second harmonic frequencies.
-

NEW QUESTION # 74
What is measured with a test object containing closely spaced, highly reflective targets along the direction of beam?

A. Sensitivity
B. Lateral resolution
C. Specificity
D. Axial resolution

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution is the system's ability to distinguish two structures located along the direction of the ultrasound beam (parallel to the beam axis). Test objects or phantoms contain closely spaced pins or reflectors along this axis to evaluate axial resolution.
Principles and Instrumentation state:
"Axial resolution is determined by the spatial pulse length and is tested using targets positioned along the beam axis."
* Sensitivity (A) relates to detection of weak echoes.
* Specificity (B) refers to diagnostic accuracy, not phantom testing.
* Lateral resolution (C) is evaluated using side-by-side (perpendicular) targets.
Therefore, the correct answer is D: Axial resolution.
-

NEW QUESTION # 75
......

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Valid SPI Exam Topics | Knowledge SPI Points

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q70-Q75):

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