The statement 'Contrast resolution relates to gray-level differences' is:

• A. True
• B. False
• C. Not relevant
• D. Depends on color

Answer: (A)

Contrast resolution is the ability to distinguish small differences in brightness between neighboring structures, i.e., to separate subtle gray shades. The higher the bit depth and dynamic range, the more gray levels are available, allowing finer discrimination of tissue differences. Because contrast resolution centers on gray-level differences, the statement is correct. Color information can accompany images, but the core measure of contrast resolution is how well these gray shades can be distinguished. The other options don’t fit: false would contradict the defined link to gray-level differences, not relevant would ignore the fundamental idea, and it does not depend on color in the way those choices imply.