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NEW QUESTION # 16
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 # 17
What does changing the displayed depth control directly affect?
Answer: B
Explanation:
Changing the displayed depth control directly affects the pulse repetition frequency (PRF). When the depth setting is increased, the ultrasound system needs more time to send and receive echoes from deeper structures, resulting in a lower PRF. Conversely, decreasing the depth allows for a higher PRF since the time required for the sound waves to travel to and from the structures is shorter. PRF is crucial for determining the maximum detectable velocity in Doppler ultrasound without aliasing. Reference:
ARDMS Sonography Principles and Instrumentation guidelines
"Understanding Ultrasound Physics" by Sidney K. Edelman
NEW QUESTION # 18
Which adjustment resulted in the change from image A to image B?
Answer: D
Explanation:
Increased Transmit Frequency: This would generally improve the resolution of the image but does not directly correlate to the changes seen in the provided image link.
Increased Scale: Adjusting the scale changes the velocity range displayed but does not directly affect the speckle or noise reduction.
Decreased Color Gain: Reducing the color gain can decrease the amount of color noise, making the blood flow regions more defined, which aligns with the change observed from image A to image B.
Decreased Acoustic Power: This reduces the overall intensity of the ultrasound beam, affecting penetration depth and overall brightness but is less likely to result in the specific improvements seen.
Reference:
"Understanding Ultrasound Physics" by Sidney K. Edelman
ARDMS Sonography Principles and Instrumentation study materials
NEW QUESTION # 19
What happens to the amount of attenuation if the path length is doubled?
Answer: B
Explanation:
Attenuation in ultrasound is directly proportional to the path length. If the path length is doubled, the amount of attenuation is also doubled. Attenuation refers to the reduction in the amplitude and intensity of the ultrasound wave as it travels through tissue, primarily due to absorption, reflection, and scattering. The relationship is linear, so doubling the distance the sound wave travels will result in twice the amount of attenuation.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.
NEW QUESTION # 20
What is the purpose of applying compression to the received signals?
Answer: A
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 # 21
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