Which area of an image should be shuttered due to being excessively bright?

• A. Bright white
• B. Soft tissue
• C. Air pockets
• D. Bone

Answer: (A)

When an area of an X-ray image becomes excessively bright, it means that region has been overexposed to the point of clipping, where you lose any useful detail because the density value is maxed out. Shuttering or masking that area helps prevent the overexposed patch from dominating the image and makes it clear that the exposure was too high, signaling a need to adjust technique. The overly bright region corresponds to a saturation effect, not to the natural appearance of different tissues.

Soft tissue, air pockets, and bone each have characteristic appearances on radiographs, but they aren’t inherently regions of excessive brightness due to clipping. Air pockets appear very dark, soft tissue is mid-gray, and bone is typically bright but not necessarily overexposed to the point of clipping.