The detector exposure range of 1 µGy to 1000 µGy corresponds to which concept?

• A. Spatial resolution
• B. Dynamic range
• C. Quantum mottle
• D. Exposure latitude

Answer: (B)

Dynamic range is about the span of exposure levels a detector can accurately convert into a usable image, from the smallest signal it can detect up to the point where it saturates. A detector that responds well from 1 µGy up to 1000 µGy demonstrates a wide tonal range, meaning it can capture both very dark and very bright areas with useful detail rather than washing out highlights or losing contrast in shadows. This is what the term dynamic range captures—the detector’s ability to produce meaningful signal across a broad exposure spectrum, not just a single exposure level.

Spatial resolution, on the other hand, deals with how small of a detail can be distinguished in the image, which is about pixel size and system geometry rather than exposure levels. Quantum mottle refers to graininess caused by insufficient photons reaching the detector, a noise issue tied to low exposure rather than the range of exposures the detector can handle. Exposure latitude describes how forgiving a technique is to errors in exposure—how much variation in exposure still yields acceptable images—whereas the given range specifically indicates the detector’s tonal response capability, i.e., dynamic range.