If the exposure field is not accurately recognized, the histogram:

• A. Narrows
• B. Widens
• C. Remains the same
• D. Becomes unstable

Answer: (B)

When the exposure field is not recognized correctly, the system’s histogram ends up sampling a broader range of pixel values than intended. The exposure field defines where the useful image data resides and guides how the histogram is constructed and how the image is rescaled for display. If that boundary is off, data from outside the actual anatomy can be included, or the region used for calculation shifts, so the spread of pixel values becomes wider. In other words, more gray levels are represented across the image, making the histogram widen. It wouldn’t narrow or stay the same, and it typically isn’t inherently unstable unless there’s an additional fault—so widening is the expected behavior.