Comprehensive and Detailed Explanation From Exact Extract:
When color Doppler gain is set too high, the system amplifies noise signals, leading to random color speckles appearing within anechoic or hypoechoic areas where no true flow exists. This artifact is known as "color bleeding" or "color noise."
According to sonography instrumentation reference:
“Excessive color Doppler gain can cause noise to overwrite areas without flow, resulting in false color signals within fluid-filled or hypoechoic structures.”
Therefore, the correct answer is D: Color gain set too high.
62
Which adjustment was made to change image A to produce image B?
A close-up of an ultrasound
Description automatically generated
A. Increased overall gain
B. Decreased overall gain
C. Increased dynamic range
D. Decreased dynamic range
Answer: D
Comprehensive and Detailed Explanation From Exact Extract:
In Image B, compared to Image A, you can observe a higher contrast image with darker darks and brighter brights, indicating that dynamic range has been reduced. Decreasing dynamic range results in less grey scale, creating a more black-and-white appearance and emphasizing contrast differences.
According to sonography instrumentation reference:
“Reducing dynamic range increases image contrast by narrowing the range of displayed echo intensities, making the image appear more black and white.”
Therefore, the correct answer is D: Decreased dynamic range.
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