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[Hardware] SPI Download & SPI Dump Torrent

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【Hardware】 SPI Download & SPI Dump Torrent

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ARDMS Sonography Principles and Instrumentation Sample Questions (Q36-Q41):NEW QUESTION # 36
In this image, which characteristics of flow are represented by the upper right side of a variance mode color map?

  • A. Higher velocity, turbulent with a positive Doppler shift
  • B. Higher velocity, laminar with a positive Doppler shift
  • C. Higher velocity, turbulent with a negative Doppler shift
  • D. Higher velocity, laminar with a negative Doppler shift
Answer: A
Explanation:
In a variance mode color map, the upper right side typically indicates higher velocity and turbulent flow with a positive Doppler shift. Variance mode maps are designed to display not only the mean velocity and direction of blood flow but also the presence of turbulence. The color green is often used in the upper right quadrant to represent areas of turbulence with positive Doppler shifts, which occur when the blood flow is moving towards the transducer at higher velocities and with increased chaotic motion.References:
* ARDMS Sonography Principles and Instrumentation guidelines
* "Diagnostic Ultrasound: Physics and Equipment" by Peter Hoskins, Kevin Martin, Abigail Thrush

NEW QUESTION # 37
Which can cause color aliasing?
  • A. Low frame rate
  • B. Low pulse repetition frequency
  • C. High wall filter
  • D. High Doppler gain
Answer: B
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Color aliasing occurs when the Doppler shift exceeds the Nyquist limit, which is determined by the pulse repetition frequency (PRF). A low PRF reduces the Nyquist limit, making aliasing more likely.
According to sonography instrumentation reference:
"Aliasing occurs in color Doppler imaging when the Doppler shift frequency exceeds half of the PRF (Nyquist limit). A low PRF increases the likelihood of aliasing." Therefore, the correct answer is A: Low pulse repetition frequency.
-

NEW QUESTION # 38
Which process is used to fill in blank spaces between scan lines?
  • A. Interpolation
  • B. Logarithmic compression
  • C. Coded excitation
  • D. Autocorrelation
Answer: A
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Interpolation estimates pixel values between scan lines by averaging adjacent data, filling in gaps to create a smoother, more complete image without additional scanning.
According to sonography instrumentation reference:
"Interpolation is a post-processing technique that fills gaps between scan lines by estimating values based on surrounding echoes, improving image smoothness." Therefore, the correct answer is D: Interpolation.
-

NEW QUESTION # 39
What is the purpose of applying compression to the received signals?
  • A. Reduce the dynamic range
  • B. Decrease the frame rate
  • C. Decrease the spatial pulse length
  • D. Reduce the field of view
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.
-

NEW QUESTION # 40
Which adjustment produced the change from waveform A to waveform B?

  • A. Decreased wall filter
  • B. Increased wall filter
  • C. Increased Doppler gain
  • D. Decreased Doppler gain
Answer: C
Explanation:
Comprehensive and Detailed Explanation From Exact Extract:
Comparing waveform A to waveform B:
In image B, the Doppler spectral waveform is brighter, with stronger signal amplitude and more clearly visible Doppler shifts.
This indicates that the Doppler gain was increased, amplifying the strength of the returning Doppler signals displayed on the spectral waveform.
According to official sonography Principles and Instrumentation:
"Doppler gain controls the amplification of returning Doppler signals. Increasing the gain enhances signal amplitude, making weaker Doppler signals more visible." Decreasing gain (B) would have produced a dimmer waveform.
Changes in wall filter (C and D) would primarily affect low-velocity signal display, not overall brightness.
Therefore, the correct answer is A: Increased Doppler gain.

NEW QUESTION # 41
......
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