What are the signs of overexposure in imaging and how should they be addressed?

• A. Skin erythema is a common sign in diagnostic radiography.
• B. There are usually no observable signs of overexposure in diagnostic radiography.
• C. Acute signs include skin erythema or tissue injury, though rare; address by reducing dose, adjusting technique, shielding and positioning.
• D. Repeating the exam with higher dose corrects the issue.

Answer: (C)

Overexposure signs in imaging are about how the skin and tissues respond to too much radiation. In diagnostic radiography, such signs are rare, but when they do occur the most recognizable one is skin erythema, and at very high doses there can be tissue injury. The best way to address this is to act on the dose itself: reduce the exposure by selecting appropriate technique factors (lowering mA or exposure time, or adjusting kVp as needed for the exam while maintaining image quality), use shielding to protect sensitive skin and underlying tissues, and ensure proper positioning and collimation to limit the exposed area. If the field is moved or the technique is improved to avoid repeated exposure of the same skin region, the risk of recurrence drops.

Why the others don’t fit as well: repeating the exam with a higher dose would only increase exposure and risk, not fix the problem. And while there are typically no visible signs in many routine exams, overexposure can still occur without obvious signs, so dose optimization and monitoring remain essential rather than relying on a lack of visible effects.