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Latest ARDMS SPI Practice test Material in Three Different Formats

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q35-Q40):

NEW QUESTION # 35
What is the result of increased transducer damping?

A. Increased sensitivity
B. Improved axial resolution
C. Longer pulse length
D. Narrow beam width

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Damping material is applied to the back of the piezoelectric crystal to absorb energy and shorten the pulse duration. Shorter pulse durations reduce spatial pulse length, which directly improves axial resolution by enabling better separation of structures along the beam path.
According to sonography instrumentation reference:
"Greater transducer damping results in shorter pulse duration and improved axial resolution but reduces sensitivity." Therefore, the correct answer is D: Improved axial resolution.

NEW QUESTION # 36
In this image, which artifact is demonstrated?

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

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.
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 # 37
What is an advantage of pulsed-wave Doppler over continuous-wave Doppler?

A. High signal-to-noise ratio
B. Range resolution
C. Increased sensitivity to slow flow
D. Unlimited maximum detectable velocity

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The primary advantage of pulsed-wave Doppler is its ability to provide range resolution. This means the operator can select a specific depth (sample volume) from which Doppler signals are acquired, allowing precise localization of blood flow velocities.
According to sonography instrumentation reference:
"Pulsed-wave Doppler allows for range resolution, enabling velocity measurements at a specific depth along the ultrasound beam path." Continuous-wave Doppler does not have range resolution, as it measures velocities along the entire beam path.
Therefore, the correct answer is C: Range resolution.

NEW QUESTION # 38
Which outcome is an advantage of more pulses in an ensemble length?

A. Reduced ghosting artifact
B. Increased line density
C. Improved temporal resolution
D. Increased accuracy of velocity measurement

Answer: D

Explanation:
Ensemble length, also known as packet size or Doppler packet, refers to the number of pulses used to calculate each Doppler measurement. Increasing the number of pulses in an ensemble length improves the accuracy of velocity measurements by providing more data points for the Doppler shift analysis. This leads to better estimation of mean velocities and reduces the variability of the measurements, although it may slightly decrease temporal resolution due to the longer time required to acquire the data.
ARDMS Sonography Principles and Instrumentation guidelines
Edelman, S. K. (2017). Understanding Ultrasound Physics.

NEW QUESTION # 39
Which spectral Doppler finding can occur when using a low pulse repetition frequency setting?

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

Answer: B

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Low PRF reduces the Nyquist limit, making the system more susceptible to aliasing when Doppler shift frequencies exceed this limit.
Principles and Instrumentation state:
"Aliasing occurs when Doppler shifts exceed half the PRF (Nyquist limit). Lowering PRF increases aliasing susceptibility."
* Spectral broadening (A) results from turbulence or poor angle.
* Range ambiguity (B) occurs at high PRF.
* Dropout (D) refers to signal loss, not aliasing.
Therefore, the correct answer is C: Aliasing.
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NEW QUESTION # 40
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