What is the effect of inappropriate gain settings on border detection and measurement accuracy?

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Gain controls image brightness and contrast in a way that directly affects how clearly borders are seen. If gain is too high, the image becomes overly bright and speckle noise and tissue signals saturate, reducing the contrast between the blood pool and the myocardium. That makes endocardial and epicardial borders appear blurred, so it’s hard to draw accurate outlines for measurements. If gain is too low, the overall signal is diminished and borders can vanish into darkness or appear poorly defined, again compromising border detection. When borders aren’t clearly delineated, derived measurements such as chamber size, wall thickness, and volumes become unreliable. Because inappropriate gain can cause both border blur and hidden borders, this is why the correct statement notes that excessive gain blurs borders, reduced gain hides borders, and both distort measurements. In contrast, gain does affect border detection, and saying it has no effect would be incorrect.