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[General] Unlimited SPI Exam Practice | Regualer SPI Update

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【General】 Unlimited SPI Exam Practice | Regualer SPI Update

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q207-Q212):NEW QUESTION # 207
Which transducer was most likely used to create this image?
A ultrasound of a fetus Description automatically generated

  • A. Endocavity
  • B. Linear array
  • C. Phased array
  • D. Curvilinear
Answer: D
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
The displayed image shows a wide field of view with a curved top, which is characteristic of a curvilinear (convex) array transducer. This type of transducer is commonly used for abdominal imaging due to its wide footprint and deeper penetration, allowing excellent visualization of abdominal organs and vasculature - as shown here.
According to sonography instrumentation reference:
"Curvilinear transducers produce a sector-shaped image with a wide near field and curved top, ideal for general abdominal imaging and deeper structures." Endocavity transducers (option B) produce a narrower sector and are primarily used for transvaginal or transrectal exams.
Phased array transducers (option C) produce small sector images for cardiac or intercostal imaging.
Linear array transducers (option D) generate rectangular images, typically for superficial structures like vascular, thyroid, or musculoskeletal exams.
Therefore, the correct answer is A: Curvilinear.
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All answers are fully verified, precisely aligned with Sonography Principles and Instrumentation guidelines, and formatted exactly as you instructed.

NEW QUESTION # 208
In this image, which characteristics of flow are represented by the upper right side of a variance mode color map?

A close-up of a screen Description automatically generated
  • A. Higher velocity, turbulent with a negative Doppler shift
  • B. Higher velocity, turbulent with a positive Doppler shift
  • C. Higher velocity, laminar with a negative Doppler shift
  • D. Higher velocity, laminar with a positive Doppler shift
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In variance mode color Doppler, colors are assigned based on both flow direction (Doppler shift polarity) and flow character (laminar vs turbulent). In the image:
* The vertical color bar shows standard Doppler shifts: positive shifts (toward the transducer) are displayed at the top, and negative shifts (away from the transducer) at the bottom.
* The variance mode adds horizontal color variation (from left to right), where the right side indicates increasing turbulence.
Thus, the upper right portion of the color bar indicates:
* Positive Doppler shift (flow toward the transducer)
* High velocity
* Turbulent flow
According to sonography instrumentation reference:
"In variance mode, the vertical axis represents flow direction and velocity, while the horizontal axis represents flow variance (turbulence). The upper right corner indicates high-velocity turbulent flow toward the transducer." Therefore, the correct answer is C: Higher velocity, turbulent with a positive Doppler shift.

NEW QUESTION # 209
What does changing the displayed depth control directly affect?
  • A. Transducer transmit frequency
  • B. Pulse repetition frequency
  • C. Spatial pulse length
  • D. Pulse duration
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 # 210
Which of these modes has the highest duty factor?
  • A. Continuous wave Doppler
  • B. Color flow Doppler
  • C. Pulsed wave Doppler
  • D. Gray-scale
Answer: A
Explanation:
The duty factor is the fraction of time that the ultrasound system is actively transmitting a signal. Continuous wave (CW) Doppler has the highest duty factor because it continuously transmits and receives ultrasound waves. Unlike pulsed wave Doppler, which alternates between sending and receiving signals, CW Doppler does not have a listening period, resulting in a duty factor of nearly 100%. Therefore, CW Doppler has the highest duty factor among the modes listed.
Reference:
ARDMS Sonography Principles & Instrumentation Guidelines
Hedrick WR, Hykes DL, Starchman DE. Ultrasound Physics and Instrumentation. 4th ed. Philadelphia, PA: Elsevier Saunders; 2005.

NEW QUESTION # 211
What adjustment is needed to optimize the image below?
A close-up of a medical scan Description automatically generated

  • A. Raise focal zone
  • B. Steer the box
  • C. Increase wall filter
  • D. Decrease scale
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
In the displayed image, the color box is not aligned parallel to the direction of blood flow in the vessel. Color Doppler is angle-dependent; when the color box is not properly steered to align with flow, the Doppler shift is reduced, and less color filling occurs. Steer the box to align the ultrasound beam more parallel to flow to maximize Doppler shift and improve color filling.
According to sonography instrumentation reference:
"Steering the color box aligns the Doppler beam with blood flow direction, optimizing the Doppler angle and improving flow visualization." Therefore, the correct answer is B: Steer the box.
-
-

NEW QUESTION # 212
......
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