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ARDMS Sonography Principles and Instrumentation Sample Questions (Q106-Q111):

NEW QUESTION # 106
What occurs when the pulse repetition frequency is less than twice the Doppler shift frequency?

A. Range ambiguity
B. Propagation speed artifact
C. Spectral broadening
D. Aliasing

Answer: D

Explanation:
Aliasing occurs in Doppler ultrasound when the pulse repetition frequency (PRF) is less than twice the Doppler shift frequency (Nyquist limit). When this condition is met, the Doppler signals are not sampled frequently enough to accurately measure the frequency shifts, resulting in the misrepresentation of the flow velocities. This causes the aliasing artifact, where high-velocity flows are displayed incorrectly as wrapping around the baseline, leading to potential diagnostic errors.
Reference: ARDMS Sonography Principles and Instrumentation (SPI) Review, Doppler Artifacts section.

NEW QUESTION # 107
Which resolution is degraded when utilizing multiple transmit focal zones?

A. Elevational
B. Lateral
C. Temporal
D. Axial

Answer: C

Explanation:
When utilizing multiple transmit focal zones, the ultrasound system must perform multiple transmissions at each focal depth. This process requires more time for data acquisition, which in turn decreases the frame rate. A lower frame rate directly impacts temporal resolution, which is the ability to accurately depict moving structures over time. Thus, using multiple focal zones improves lateral resolution but degrades temporal resolution.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.

NEW QUESTION # 108
What adjustment is needed to visualize the borders of the anatomical structures in the image below?

A. Decrease depth
B. Increase sector width
C. Lower focal zone
D. Increase dynamic range

Answer: D

Explanation:
Dynamic range in ultrasound imaging refers to the range of signal amplitudes that the system can display. Increasing the dynamic range allows the ultrasound system to display a broader range of echo amplitudes, which enhances the contrast resolution and helps to visualize subtle differences in tissue texture and borders of anatomical structures. When the dynamic range is increased, more shades of gray are used, making the image appear softer and less contrasty, which is beneficial for delineating the borders of anatomical structures more clearly.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.

NEW QUESTION # 109
Which of these modes has the highest duty factor?

A. Continuous wave Doppler
B. Gray-scale
C. Color flow Doppler
D. Pulsed wave Doppler

Answer: A

Explanation:
The duty factor is the fraction of time that the ultrasound system is actively transmitting a signal. Continuous wave (CW) Doppler has the highest duty factor because it continuously transmits and receives ultrasound waves. Unlike pulsed wave Doppler, which alternates between sending and receiving signals, CW Doppler does not have a listening period, resulting in a duty factor of nearly 100%. Therefore, CW Doppler has the highest duty factor among the modes listed.
References:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE.Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA:
Elsevier Saunders; 2005.

NEW QUESTION # 110
What is the benefit of using a wall filter?

A. Reduces aliasing
B. Increases velocity range
C. Increases signal-to-noise ratio
D. Removes low-frequency signals

Answer: D

Explanation:
A wall filter in Doppler ultrasound is designed to remove low-frequency signals that are often caused by tissue motion, vessel wall movement, or other forms of motion artifact. These low-frequency signals can clutter the Doppler spectrum, making it difficult to accurately interpret blood flow velocities. By filtering out these unwanted low-frequency signals, the wall filter helps to enhance the clarity of the Doppler signal, allowing for more accurate measurements of blood flow velocities.
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.

NEW QUESTION # 111
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SPI Relevant Exam Dumps & Study SPI Plan

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q106-Q111):

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