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ARDMS Sonography Principles and Instrumentation Sample Questions (Q163-Q168):

NEW QUESTION # 163
What is a potential negative consequence of using a high wall filter?

A. Aliasing could occur
B. Desired signal may be eliminated
C. Penetration is reduced
D. Too much noise may appear on the image

Answer: B

Explanation:
A high wall filter is used in Doppler ultrasound to eliminate low-frequency signals that may be attributed to vessel wall motion or other low-velocity flows. However, if the wall filter is set too high, it can inadvertently eliminate desired low-frequency Doppler signals that represent real blood flow, particularly in smaller vessels or those with slower flow velocities. This results in a loss of valuable diagnostic information.
Reference: ARDMS Sonography Principles and Instrumentation (SPI) Review, Doppler Ultrasound section.

NEW QUESTION # 164
"Sensitivity represents the proportion of actual positive cases correctly identified by the test." Therefore, the correct answer is B: 32/35.
At what Doppler angle to flow is the maximum Doppler shift frequency acquired?

A. 90 degrees
B. 30 degrees
C. 0 degrees
D. 60 degrees

Answer: C

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The Doppler equation shows that the frequency shift is proportional to the cosine of the Doppler angle. The maximum value of cosine (cos 0° = 1) occurs at 0 degrees - meaning the beam is parallel to flow. At this angle, the full velocity component is measured.
According to sonography instrumentation reference:
"The maximum Doppler shift is obtained when the ultrasound beam is parallel (0 degrees) to blood flow." Therefore, the correct answer is D: 0 degrees.

NEW QUESTION # 165
Which action is the first step for the removal of visible contaminants from the transducer?

A. Disinfect
B. Clean
C. Pasteurize
D. Sterilize

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The proper care and reprocessing of ultrasound transducers follow a strict hierarchy of steps. The first step is always physical cleaning, which involves removing visible debris, gel, and contaminants from the transducer surface. This must be done prior to any disinfection or sterilization process because organic material can inhibit the effectiveness of these subsequent steps.
According to sonography Principles and Instrumentation documentation:
"Cleaning is the first and essential step in reprocessing ultrasound probes. It removes gel, blood, and other organic material. Disinfection or sterilization should never be performed before cleaning, as residual debris reduces their effectiveness." Therefore, the correct answer is C: Clean.
-

NEW QUESTION # 166
Which color Doppler control allows for reassignment of red and blue to represent flow direction?

A. Color invert
B. Color priority
C. Color gain
D. Color threshold

Answer: A

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In color Doppler imaging, the default color map assigns red and blue to represent flow direction relative to the transducer (usually red toward, blue away). The color invert control reverses this assignment.
According to sonography Principles and Instrumentation:
"The color invert control reverses the baseline of the color map, swapping red and blue assignments for flow direction." Color priority adjusts the overlay of color vs grayscale.
Color gain controls amplification of the Doppler signal.
Color threshold sets minimum amplitude to display color.
Therefore, the correct answer is D: Color invert.
-

NEW QUESTION # 167
Which component of a contrast agent causes a marked mismatch in impedance between the agent and blood?

A. Serous liquid
B. Viscous liquid
C. Solid
D. Gas

Answer: D

Explanation:
Contrast agents used in ultrasound imaging typically consist of microbubbles filled with gas. The significant mismatch in acoustic impedance between the gas in the microbubbles and the surrounding blood creates strong reflectors of the ultrasound waves, enhancing the echogenicity of blood and improving the visibility of blood flow and tissue perfusion. The high contrast provided by the gas-filled microbubbles makes them particularly effective as ultrasound contrast agents.
References:
ARDMS Sonography Principles & Instrumentation Guidelines
Kremkau FW. Sonography Principles and Instruments. 9th ed. Philadelphia, PA: Elsevier; 2016.

NEW QUESTION # 168
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Pass Guaranteed ARDMS - SPI - Reliable Sonography Principles and Instrumentation Certification Exam

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q163-Q168):

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