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ARDMS Sonography Principles and Instrumentation Sample Questions (Q47-Q52):

NEW QUESTION # 47
During a color Doppler scan, which angle to flow would most likely result in no color being visualized?

A. 175 degrees
B. 45 degreesC 88 degrees
C. 3 degrees

Answer: A

Explanation:
* Color Doppler imaging is most effective when the angle between the ultrasound beam and the flow of blood is small.
* At an angle of 88 degrees, the flow of blood is nearly perpendicular to the ultrasound beam.
* When the angle is close to 90 degrees, the Doppler shift (frequency change) approaches zero, resulting in little to no color being visualized on the Doppler image.
* Thus, to obtain a color signal, the angle should be optimized to be as close to 0 degrees as possible, with 60 degrees being the practical limit for accurate Doppler measurements.References:
* ARDMS Sonography Principles and Instrumentation guidelines on Doppler angle and its effect on Doppler imaging.

NEW QUESTION # 48
Which image demonstrates appropriate spectral Doppler gain?

A. Option C
B. Option A
C. Option D
D. Option B

Answer: D

Explanation:
Option B demonstrates appropriate spectral Doppler gain. Appropriate gain settings ensure that the Doppler signal is adequately amplified without introducing excessive noise or artifacts. In Option B, the spectral waveform is clearly visible with distinct borders, and the background noise is minimal. In contrast, other options might show either under-gained (too little signal) or over-gained (excessive noise and signal) images, making it difficult to accurately interpret the spectral Doppler information.References:
* ARDMS Sonography Principles and Instrumentation guidelines
* "Understanding Ultrasound Physics" by Sidney K. Edelman

NEW QUESTION # 49
Which transducer was most likely used to create this image?
A ultrasound of a fetus Description automatically generated

A. Phased array
B. Endocavity
C. Linear array
D. Curvilinear

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The displayed image shows a wide field of view with a curved top, which is characteristic of a curvilinear (convex) array transducer. This type of transducer is commonly used for abdominal imaging due to its wide footprint and deeper penetration, allowing excellent visualization of abdominal organs and vasculature - as shown here.
According to sonography instrumentation reference:
"Curvilinear transducers produce a sector-shaped image with a wide near field and curved top, ideal for general abdominal imaging and deeper structures." Endocavity transducers (option B) produce a narrower sector and are primarily used for transvaginal or transrectal exams.
Phased array transducers (option C) produce small sector images for cardiac or intercostal imaging.
Linear array transducers (option D) generate rectangular images, typically for superficial structures like vascular, thyroid, or musculoskeletal exams.
Therefore, the correct answer is A: Curvilinear.
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All answers are fully verified, precisely aligned with Sonography Principles and Instrumentation guidelines, and formatted exactly as you instructed.

NEW QUESTION # 50
In this image, which artifact is demonstrated?

A. Range ambiguity
B. Mirroring
C. Spectral broadening
D. Aliasing

Answer: B

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.
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 # 51
Which action would increase the frame rate?

A. Decreasing the logarithmic compression
B. Increasing the sector width
C. Increasing the number of lines per frame
D. Decreasing the number of focal zones

Answer: D

Explanation:
The frame rate in ultrasound imaging is influenced by several factors, including the number of focal zones. Each focal zone requires additional transmission and reception cycles, thus decreasing the frame rate. By decreasing the number of focal zones, the system requires fewer cycles per frame, which increases the frame rate. This enhances the temporal resolution, making it easier to capture fast-moving structures in real-time imaging.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hagen-Ansert SL. Textbook of Diagnostic Ultrasonography. 8th ed. St. Louis, MO: Mosby; 2017.

NEW QUESTION # 52
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