Each PACS monitor must be calibrated to GSDF to ensure images are displayed with correct:

• A. Brightness and contrast
• B. Spatial resolution
• C. Matrix size
• D. Geometric dimensions

Answer: (A)

GSDF calibration ensures that a given digital gray value maps to a consistent display luminance so that each step in the gray scale produces a uniform perceptual change in brightness. This makes brightness and contrast—how light or dark an image looks and how clearly different tissues stand out—reliable across different PACS monitors and viewing conditions. It doesn’t directly affect spatial resolution, matrix size, or geometric dimensions, which are determined by the image data and the display hardware rather than the grayscale calibration. By aligning displays to GSDF, radiologists can trust that the contrast relationships they rely on for detection remain consistent, regardless of which monitor is used.