2025 ARDMS SPI: SONOGRAPHY PRINCIPLES AND INSTRUMENTATION PERFECT DUMPS COLLECTION

2025 ARDMS SPI: Sonography Principles and Instrumentation Perfect Dumps Collection

2025 ARDMS SPI: Sonography Principles and Instrumentation Perfect Dumps Collection

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q47-Q52):

NEW QUESTION # 47
What is the primary factor that affects axial resolution?

  • A. Aperture
  • B. Speed of sound
  • C. Focal zone
  • D. Spatial pulse length

Answer: D

Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Axial resolution refers to the ability to distinguish two structures that are located along the path of the ultrasound beam. It is directly related to the spatial pulse length (SPL), which is the product of the number of cycles per pulse and the wavelength. A shorter SPL leads to better axial resolution.
According to sonography instrumentation reference:
"Axial resolution improves as spatial pulse length decreases because shorter pulses can better differentiate structures lying close together along the beam axis." Therefore, the correct answer is B: Spatial pulse length.
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NEW QUESTION # 48
Which settings will lead to the highest temporal resolution?

  • A. 60-degree sector width, 5 cm scan depth, color Doppler on
  • B. 45-degree sector width, 4 cm scan depth, color Doppler off
  • C. 60-degree sector width, 5 cm scan depth, color Doppler off
  • D. 45-degree sector width, 4 cm scan depth, color Doppler on

Answer: B

Explanation:
The settings that lead to the highest temporal resolution are those that reduce the amount of information that the ultrasound system needs to process, allowing for a higher frame rate. A smaller sector width and shallower scan depth reduce the area that needs to be imaged, enabling faster data acquisition. Turning off color Doppler further reduces processing demands, as the system no longer needs to compute and display color flow information. Therefore, a 45-degree sector width, 4 cm scan depth, and color Doppler off will provide the highest temporal resolution.
Reference:
ARDMS Sonography Principles and Instrumentation (SPI) Exam Study Guide
"Diagnostic Ultrasound: Principles and Instruments" by Frederick W. Kremkau


NEW QUESTION # 49
What results from increasing the packet length when using color Doppler imaging?

  • A. Decreased frame rate
  • B. Increased color noise
  • C. Increased aliasing
  • D. Decreased penetration

Answer: A

Explanation:
Increasing the packet length in color Doppler imaging means increasing the number of pulses used to interrogate each scan line. This improves the accuracy of velocity measurements and sensitivity to low flow velocities but has the drawback of decreasing the frame rate. A longer packet length requires more time to acquire the necessary data, which reduces the number of frames that can be processed and displayed per second. Consequently, while color Doppler imaging becomes more precise, the temporal resolution (frame rate) decreases.References:
* ARDMS Sonography Principles and Instrumentation guidelines
* "Color Doppler, Power Doppler, and Spectral Doppler" by Michael J. Riccabona


NEW QUESTION # 50
What is an advantage of power Doppler over color Doppler?

  • A. Diminished flash artifact
  • B. Accurate velocity information
  • C. Less angle dependent
  • D. Increased frame rate

Answer: C

Explanation:
Power Doppler, unlike color Doppler, is less angle dependent because it detects the strength of the Doppler signal rather than the velocity of the blood flow. This means it is more sensitive to detecting low-velocity flow and flow in smaller vessels, regardless of the angle between the ultrasound beam and the flow direction. Color Doppler provides information on flow direction and velocity but is highly dependent on the angle of insonation, making it less reliable when the angle is suboptimal.
Reference:
ARDMS Sonography Principles and Instrumentation guidelines
Zwiebel, W. J., & Pellerito, J. S. (2017). Introduction to Vascular Ultrasonography. Elsevier.


NEW QUESTION # 51
What happens to the amount of attenuation if the path length is doubled?

  • A. Halved
  • B. Quartered
  • C. Doubled
  • D. Quadrupled

Answer: C

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.
ARDMS Sonography Principles and Instrumentation guidelines
Kremkau, F. W. (2015). Diagnostic Ultrasound: Principles and Instruments. Elsevier.


NEW QUESTION # 52
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