Window width controls the brightness of the image on the display.

• A. True
• B. False
• C. It controls saturation
• D. It controls brightness and contrast jointly

Answer: (B)

Window width determines how many gray shades are displayed from the range of densities. A narrow width maps a small range of values to visible gray levels, which makes differences between tissues more pronounced (higher contrast). A wide width spreads a larger range of values across the same display, reducing contrast. Brightness on the screen, however, is controlled by window level, which sets the center of the range and shifts the overall brightness of the image. So the statement isn’t correct: width affects contrast, not brightness. The idea of controlling saturation doesn’t apply here, and the notion of jointly controlling brightness and contrast with width isn’t accurate because brightness is governed by level.