What effect does the gain control have on the ultrasound image?

What effect does the gain control have on the ultrasound image?

• A. Controls image contrast
• B. Adjusts depth
• C. Changes color map
• D. Controls amplification/brightness of image

Answer: (D)

Gain control determines how strongly the returning echoes are amplified before display, which sets the image brightness. When you increase gain, every echo is amplified, so the image becomes brighter and even weak reflections (and noise) become visible. Decreasing gain makes the image darker and can hide details. This is different from depth, which changes how deep the field of view goes, or from color map settings, which change how echoes are mapped to color or grayscale. So the gain control is all about amplification and brightness of the image.

Gain control determines how strongly the returning echoes are amplified before display, which sets the image brightness. When you increase gain, every echo is amplified, so the image becomes brighter and even weak reflections (and noise) become visible. Decreasing gain makes the image darker and can hide details. This is different from depth, which changes how deep the field of view goes, or from color map settings, which change how echoes are mapped to color or grayscale. So the gain control is all about amplification and brightness of the image.