The look-up table that is used to determine the brightness and contrast of an image is unique for each anatomic part.

• A. True
• B. False
• C. It depends on the exposure
• D. It depends on the device

Answer: (A)

The main idea is that how an image is displayed is tailored to the anatomy being imaged. A look-up table maps raw pixel values to display brightness and contrast, and different parts of the body have different tissue types, densities, and clinically important structures. To make those structures visible and to optimize contrast for each region, a specific mapping is chosen for that anatomy. For example, chest imaging might emphasize lung detail and mediastinal contrast, while bone imaging uses a mapping that highlights high-density structures. This per-anatomy optimization helps maximize diagnostic information regardless of the raw data. Exposure or device differences affect the data and available tools, but the practice of using anatomy-specific LUTs to optimize display remains. So the statement is true.