How is the fill factor defined?

The fill factor is defined as the ratio of the active area of a detector to the total area of the detector. This concept is particularly important in imaging systems, such as those used in fluoroscopy and radiography, where the active area refers to the portion of the pixel that actually collects data (or light) while the total area refers to the entire pixel size.

A higher fill factor means that a greater proportion of the detector is able to respond to incoming radiation, which can enhance image quality by increasing the system's sensitivity and reducing the effects of noise. In imaging detectors, the fill factor is crucial for achieving clearer images as it directly impacts the effectiveness of radiation detection and the overall spatial resolution of the images produced.

Other options do not pertain directly to the specific concept of fill factor. While total pixel count and resolution relate to imaging characteristics, they do not define the fill factor itself. Similarly, brightness levels in a display and signal-to-noise ratio calculations address different aspects of image quality and performance, further confirming the significance of the fill factor in defining the effectiveness of a detector.