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ARDMS Sonography Principles and Instrumentation Sample Questions (Q42-Q47):

NEW QUESTION # 42
Which change improves temporal resolution during color flow imaging?

Answer: A

Explanation:
Temporal resolution is improved by increasing the frame rate. One way to increase the frame rate is by decreasing the packet size (also known as ensemble length) in color Doppler imaging. The packet size refers to the number of pulses used to determine the Doppler shift at each location. A smaller packet size means fewer pulses are required, which allows for quicker data acquisition and thus a higher frame rate. Increasing the field of view, decreasing transmit frequency, and increasing line density would all decrease the frame rate and thus degrade temporal resolution.
References:
American Registry for Diagnostic Medical Sonography (ARDMS) Sonography Principles and Instrumentation guidelines.


NEW QUESTION # 43
Which factor does a string phantom evaluate?

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The string phantom is designed to evaluate Doppler system performance, particularly flow velocity accuracy. It uses a moving string to simulate constant flow velocities.
Principles and Instrumentation state:
"The string phantom simulates known flow velocities and is used to assess Doppler accuracy in measuring flow velocities." Two-dimensional resolution (A) is assessed by test patterns.
Intensity values (B) are tested with hydrophones.
Slice thickness (D) is tested with special slice thickness phantoms.
Therefore, the correct answer is C: Flow velocity.
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NEW QUESTION # 44
The ability to resolve two separate reflectors perpendicular to the path of the beam describes which type of resolution?

Answer: A

Explanation:
Lateral resolution describes the ability of an ultrasound system to distinguish between two structures that are side by side (perpendicular to the path of the ultrasound beam). This type of resolution depends on the beam width; narrower beams provide better lateral resolution. As the ultrasound beam travels deeper into the tissue, it generally widens, which can reduce lateral resolution. Techniques such as focusing the beam can help improve lateral resolution at specific depths by narrowing the beam width.
Reference:
American Registry for Diagnostic Medical Sonography (ARDMS). Sonography Principles and Instrumentation (SPI) Examination Review Guide.


NEW QUESTION # 45
What are two types of cavitation in tissue?

Answer: C

Explanation:
Heat and Transient: Heat and transient are not classifications of cavitation.
Thermal and Mechanical: These terms refer to different bioeffects of ultrasound but are not types of cavitation.
Stable and Transient: These are the two types of cavitation observed in tissues during ultrasound. Stable cavitation involves the oscillation of gas bubbles without collapse, while transient cavitation involves the violent collapse of gas bubbles, which can generate high temperatures and shock waves.
Thermal and Stable: Thermal effects are a different concept related to tissue heating, not a type of cavitation.
Reference:
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau ARDMS Sonography Principles and Instrumentation study materials


NEW QUESTION # 46
What is the function of M-mode?

Answer: A

Explanation:
M-mode (Motion mode) is used in ultrasound to measure and display the movement of structures over time.
This mode is particularly useful in cardiac imaging to assess the motion of heart walls and valves.
M-mode provides a one-dimensional view of the motion of tissues and is often used in conjunction with 2D imaging for a comprehensive assessment.
It is essential in evaluating the dynamic function of organs, especially in cardiology, where precise measurements of cardiac structures' movement are crucial. Reference:
ARDMS Sonography Principles and Instrumentation guidelines on modes of ultrasound imaging and their clinical applications.


NEW QUESTION # 47
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