By changing the listening time sonographers alter the _____ of the image.

By changing the listening time sonographers alter the _____ of the image.

• A. Brightness
• B. Speckle
• C. Contrast
• D. Depth

Answer: (D)

Listening time controls how far into the body the ultrasound machine listens for echoes. After the pulse is emitted, echoes take time to return from different depths. By extending the listening window, echoes from deeper tissues are captured and displayed, increasing the image’s depth range. Shortening the window hides these deeper echoes, reducing the depth shown. Brightness, speckle, and contrast are related to echo strength, interference patterns, and dynamic range, respectively, and are not directly determined by listening time.

Listening time controls how far into the body the ultrasound machine listens for echoes. After the pulse is emitted, echoes take time to return from different depths. By extending the listening window, echoes from deeper tissues are captured and displayed, increasing the image’s depth range. Shortening the window hides these deeper echoes, reducing the depth shown. Brightness, speckle, and contrast are related to echo strength, interference patterns, and dynamic range, respectively, and are not directly determined by listening time.