Comprehensive and Detailed Explanation From Exact Extract:
Overall gain amplifies the strength of all returning echoes equally, regardless of depth. It does not affect the transmitted pulse or selectively compensate for attenuation; it simply amplifies received signals uniformly.
According to sonography instrumentation reference:
“Overall gain controls the amplification of all returning echoes across the entire image, increasing brightness uniformly at all depths.”
Therefore, the correct answer is B: Amplification of signals from all depths.
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