Which statement describes the effect of increasing window width on image contrast?

Which statement describes the effect of increasing window width on image contrast?

• A. Increases contrast
• B. Decreases contrast
• C. Increases sharpness
• D. Decreases sharpness

Answer: (B)

Increasing window width expands the range of grayscale values that are displayed. When more different tissue densities fit into that wider range, the shades assigned to neighboring densities become closer together, so differences between tissues look less pronounced. In other words, the image becomes less contrasted as the window width increases. Window width doesn’t change sharpness, which depends on factors like focal spot size, motion, and geometric factors rather than the grayscale range. So, increasing window width decreases image contrast.

Increasing window width expands the range of grayscale values that are displayed. When more different tissue densities fit into that wider range, the shades assigned to neighboring densities become closer together, so differences between tissues look less pronounced. In other words, the image becomes less contrasted as the window width increases. Window width doesn’t change sharpness, which depends on factors like focal spot size, motion, and geometric factors rather than the grayscale range. So, increasing window width decreases image contrast.