Which post-processing factor affects the displayed image contrast?

Which post-processing factor affects the displayed image contrast?

• A. Window width (WW)
• B. Histogram analysis
• C. Subject contrast
• D. Exposure index

Answer: (A)

Display contrast is controlled by the window width during post-processing. The window width sets the range of pixel values that are mapped to the display’s grayscale. Narrowing that width uses a smaller range of values, so small differences between tissues become more distinct and the image appears higher in contrast. Widening the width includes more gray levels, giving a softer, flatter look with lower contrast. Among the options, window width is the direct factor that changes how contrasted the displayed image appears. Histogram analysis can tweak brightness through automatic scaling, but it isn’t the primary knob for contrast; subject contrast is about actual tissue differences, and exposure index relates to dose, not how the image is displayed.

Display contrast is controlled by the window width during post-processing. The window width sets the range of pixel values that are mapped to the display’s grayscale. Narrowing that width uses a smaller range of values, so small differences between tissues become more distinct and the image appears higher in contrast. Widening the width includes more gray levels, giving a softer, flatter look with lower contrast. Among the options, window width is the direct factor that changes how contrasted the displayed image appears. Histogram analysis can tweak brightness through automatic scaling, but it isn’t the primary knob for contrast; subject contrast is about actual tissue differences, and exposure index relates to dose, not how the image is displayed.