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ARDMS SPI Exam Syllabus Topics:
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ARDMS Sonography Principles and Instrumentation Sample Questions (Q159-Q164):
NEW QUESTION # 159
What is the purpose of applying compression to the received signals?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The primary purpose of compression is to reduce the dynamic range of received echoes, making the image more visually interpretable by adjusting contrast without losing diagnostic information.
According to sonography instrumentation reference:
"Compression reduces the dynamic range of the signal amplitudes to fit within the display range of the monitor while preserving important differences in tissue echogenicity." Therefore, the correct answer is D: Reduce the dynamic range.
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NEW QUESTION # 160
Which adjustment can maintain the same frame rate when the depth is increased?
Answer: D
Explanation:
When the depth of imaging is increased, the time it takes for the ultrasound pulses to travel to and from the deeper structures also increases, which can reduce the frame rate. To maintain the same frame rate, one effective adjustment is to decrease the image width. Narrowing the image width reduces the number of scan lines required to create each frame, allowing the system to maintain a higher frame rate despite the increased depth.
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments.
NEW QUESTION # 161
Which situation can cause color Doppler noise to overwrite an anechoic or hypoechoic area?
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
When color Doppler gain is set too high, the system amplifies noise signals, leading to random color speckles appearing within anechoic or hypoechoic areas where no true flow exists. This artifact is known as "color bleeding" or "color noise." According to sonography instrumentation reference:
"Excessive color Doppler gain can cause noise to overwrite areas without flow, resulting in false color signals within fluid-filled or hypoechoic structures." Therefore, the correct answer is D: Color gain set too high.
NEW QUESTION # 162
Which outcome is an advantage of more pulses in an ensemble length?
Answer: B
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 # 163
Which action would increase the frame rate?
Answer: A
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 # 164
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