In digital radiography, which metric indicates exposure level?

In digital radiography, which metric indicates exposure level?

• A. Exposure Index
• B. Image Noise
• C. Pixel Pitch
• D. Window Width

Answer: (A)

Exposure Index is the numeric value that reflects how much radiation the detector received. It acts as a practical gauge of exposure level and helps balance image quality with patient dose. When exposure is higher, the index rises and image noise typically decreases (up to detector limits); when exposure is too low, the index falls and noise can obscure detail. This makes the index the direct indicator clinicians rely on to assess whether the exposure was sufficient. Pixel pitch relates to spatial resolution, influencing sharpness rather than dose. Window width adjusts displayed contrast, not the amount of radiation.

Exposure Index is the numeric value that reflects how much radiation the detector received. It acts as a practical gauge of exposure level and helps balance image quality with patient dose. When exposure is higher, the index rises and image noise typically decreases (up to detector limits); when exposure is too low, the index falls and noise can obscure detail. This makes the index the direct indicator clinicians rely on to assess whether the exposure was sufficient. Pixel pitch relates to spatial resolution, influencing sharpness rather than dose. Window width adjusts displayed contrast, not the amount of radiation.