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ARDMS Sonography Principles and Instrumentation Sample Questions (Q11-Q16):
NEW QUESTION # 11
Which image demonstrates appropriate spectral Doppler gain?
Answer: B
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. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Understanding Ultrasound Physics" by Sidney K. Edelman
NEW QUESTION # 12
Which statement describes the purpose of using a spectral Doppler wall filter?
Answer: C
Explanation:
The purpose of using a spectral Doppler wall filter is to eliminate lower velocity signals. Wall filters are designed to remove low-frequency Doppler shifts caused by the motion of the vessel walls or surrounding tissues, which are generally of no diagnostic value. By eliminating these lower velocity signals, the wall filter helps to clean up the Doppler signal and reduce clutter, allowing for a clearer and more accurate display of blood flow velocities.
Reference:
ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau
NEW QUESTION # 13
Which artifact is seen as a result of an increase in echo amplitude in the tissue located distal to an anechoic structure?
Answer: B
Explanation:
Enhancement artifact occurs when an anechoic (or low-attenuation) structure, such as a cyst or fluid-filled structure, allows the ultrasound beam to pass through it with minimal attenuation. As a result, the tissues located distal to this anechoic structure appear brighter (increased echo amplitude) on the ultrasound image because the sound waves are less attenuated by the anechoic structure, leading to higher intensity echoes returning from the distal tissue. This increased brightness beyond the anechoic area is known as enhancement.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.
NEW QUESTION # 14
What method can be used to resolve aliasing artifact?
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Continuous wave (CW) Doppler can measure very high velocities without aliasing because it does not have a Nyquist limit like pulsed-wave Doppler.
Principles and Instrumentation state:
"Aliasing is eliminated in continuous wave Doppler since it does not rely on sampling and has no upper velocity limit."
* Output power (A) affects signal strength, not aliasing.
* Higher frequency (B) increases aliasing susceptibility.
* Decreasing PRF (C) actually worsens aliasing.
Therefore, the correct answer is D: Using continuous wave Doppler ultrasound.
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NEW QUESTION # 15
Which control should a sonographer use to change contrast resolution?
Answer: A
Explanation:
Reject: This control eliminates low-level noise and weak signals, affecting image quality but not primarily used for contrast resolution.
Output Power: This adjusts the intensity of the transmitted ultrasound waves but does not directly change contrast resolution.
Gain: This control amplifies all signals equally, affecting brightness but not specifically the contrast resolution.
Dynamic Range: Adjusting the dynamic range changes the range of grayscale that the ultrasound system displays, which directly affects the contrast resolution by altering how many shades of gray are visible between the black and white extremes.
Reference:
"Understanding Ultrasound Physics" by Sidney K. Edelman
ARDMS Sonography Principles and Instrumentation study materials
NEW QUESTION # 16
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