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ARDMS Sonography Principles and Instrumentation Sample Questions (Q204-Q209):

NEW QUESTION # 204
What is the primary interaction that occurs when sound waves encounter a smooth, flat surface?

A. Diffraction
B. Attenuation
C. Reflection
D. Interference

Answer: C

Explanation:
When sound waves encounter a smooth, flat surface, the primary interaction is reflection. This means the sound waves bounce back towards the transducer, producing echoes that are used to create the ultrasound image. Reflection is most effective when the surface is smooth and perpendicular to the sound beam, allowing for the maximum return of sound waves to the transducer.
ARDMS Sonography Principles and Instrumentation guidelines
Zagzebski, J. A. (1996). Essentials of Ultrasound Physics.

NEW QUESTION # 205
Which aspect(s) would best explain why the amplitude of the signal from reflector B in this diagram is less than that from reflector A?
A diagram of a transducer Description automatically generated

A. Acoustic impedance differences
B. Elasticity of the medium
C. Propagation speed differences
D. Attenuation

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
As ultrasound travels through tissue, it experiences attenuation - a reduction in signal amplitude due to absorption, scattering, and reflection. The deeper the reflector, the greater the attenuation. Therefore, the signal from reflector B (deeper structure) is weaker than from reflector A (shallower structure) primarily due to attenuation.
According to Principles and Instrumentation:
"Attenuation is the reduction in ultrasound beam strength as it propagates through tissue, resulting in decreased signal amplitude from deeper structures."
* Elasticity affects stiffness but not amplitude directly.
* Propagation speed differences cause refraction or displacement, not amplitude changes.
* Acoustic impedance differences cause reflection strength variations at interfaces but do not account for depth-dependent amplitude reduction.
Therefore, the correct answer is A: Attenuation.

NEW QUESTION # 206
What occurs when the pulse repetition frequency is less than twice the Doppler shift frequency?

A. Range ambiguity
B. Spectral broadening
C. Propagation speed artifact
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 # 207
What does damping in a pulsed-wave transducer affect?

A. Pulse duration
B. Pulse repetition frequency
C. Beam focus
D. Beam penetration

Answer: A

Explanation:
Damping in a pulsed-wave transducer primarily affects the pulse duration. Damping refers to the process of reducing the vibration of the transducer crystal after the initial excitation. When damping is applied, it shortens the length of the ultrasound pulse by quickly reducing the vibration. This results in a shorter pulse duration, which is important for improving axial resolution. Damping does not directly affect the pulse repetition frequency, beam focus, or beam penetration, although it can have indirect effects on image quality and resolution. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau

NEW QUESTION # 208
Which color Doppler setting can be optimized to eliminate low-frequency Doppler shifts without having any effect on higher Doppler frequency shifts?

A. Wall filter
B. Gain
C. Persistence
D. Scale

Answer: A

Explanation:
The wall filter is used in color Doppler and spectral Doppler imaging to eliminate low-frequency Doppler shifts caused by tissue motion or vessel wall movement. Adjusting the wall filter removes these low-frequency signals without affecting higher-frequency Doppler shifts that represent blood flow. Other settings like gain, scale, and persistence do not selectively filter out low-frequency shifts in the same manner.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.

NEW QUESTION # 209
......

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q204-Q209):

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