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Quiz 2026 ARDMS High-quality SPI: Valid Sonography Principles and Instrumentation Cram Materials

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q59-Q64):

NEW QUESTION # 59
In this image, which artifact is demonstrated?

Answer: D

Explanation:
The artifact demonstrated in the image is mirroring. This occurs when the ultrasound beam encounters a strong reflector, such as a diaphragm or pleura, and is reflected back and forth between the object and the transducer. This results in a duplicate image appearing on the other side of the strong reflector, creating a mirror image artifact. It is crucial for sonographers to recognize and differentiate this artifact from actual anatomical structures to avoid misinterpretation.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation study materials.
Diagnostic Ultrasound: Principles and Instruments by Kremkau, F. W. (latest edition).


NEW QUESTION # 60
What does this image demonstrate?

Answer: A

Explanation:
Color aliasing in Doppler ultrasound occurs when the velocity of blood flow exceeds the Nyquist limit, causing the color display to wrap around and display high velocities incorrectly as the opposite direction. This phenomenon is characterized by a mix of colors that indicate flow in both directions at the same location. In the provided image, there is a clear presence of color aliasing, as evidenced by the abrupt color change across the vessel, which is not consistent with normal flow patterns.
References:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.


NEW QUESTION # 61
Which system control adjusts amplification of signals as a function of depth?

Answer: A

Explanation:
Time Gain Compensation (TGC), also known as Depth Gain Compensation (DGC), is used to adjust the amplification of ultrasound signals based on their depth. As ultrasound waves travel deeper into the tissue, they become weaker due to attenuation. TGC compensates for this attenuation by progressively increasing the gain for deeper echoes, ensuring that structures at different depths appear with similar brightness on the ultrasound image. This function is critical for creating a uniform image and accurately visualizing deeper anatomical structures.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.


NEW QUESTION # 62
A Doppler shift is 10,000 Hz at an angle of flow of 60 degrees. What is the Doppler shift at 0 degrees?

Answer: D

Explanation:
depends on the angle between the ultrasound beam and the direction of blood flow. The Doppler equation includes a cosine function of the angle of insonation (#). At 60 degrees, the cosine is 0.5, and at 0 degrees (parallel to the flow), the cosine is 1. Thus, if the Doppler shift is 10,000 Hz at 60 degrees, it would double to
20,000 Hz at 0 degrees because the cosine of 0 degrees is 1 (cos(0°) = 1) and the cosine of 60 degrees is 0.5 (cos(60°) = 0.5). The formula is: Doppler shift at 0 degrees = Doppler shift at 60 degrees / cos(60 degrees) =
10,000 Hz / 0.5 = 20,000 Hz.
References:ARDMS Sonography Principles and Instrumentation (SPI) Review, Doppler Shift and Angle of Insonation section.


NEW QUESTION # 63
What is true regarding the display for color Doppler?

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In color Doppler, frequency shifts can be displayed either above or below the baseline in spectral Doppler. In spectral Doppler, a positive shift is displayed above the baseline by default (unless inverted). In color Doppler, red/blue assignments depend on color map orientation.
Principles and Instrumentation state:
"A positive Doppler shift (flow toward the transducer) is displayed above the baseline in spectral Doppler."
* Red color (B) does not always correspond to positive shift; it depends on color map.
* Negative shift (C) does not always indicate venous flow.
* Wall filter settings (D) affect low-velocity signals, not shift direction.
Therefore, the correct answer is A: A positive shift is always above the baseline.
-


NEW QUESTION # 64
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