CAMRT Radiography Practice Exam

Which factor influences spatial resolution in digital radiography (DR)?

1. Pixel pitch

2. Film speed

3. Radiographic technique

4. Exposure time

The correct answer is: Pixel pitch

Pixel pitch is the correct factor that influences spatial resolution in digital radiography. Spatial resolution refers to the ability of a digital imaging system to distinguish small details within an image. Pixel pitch is the distance between the centers of adjacent pixels in the digital detector. A smaller pixel pitch indicates that the pixels are closer together, which allows for the detection of finer details in the image. Therefore, a system with a smaller pixel pitch will have higher spatial resolution, enabling better clarity and definition in the visual representation of anatomical structures. In contrast, film speed, radiographic technique, and exposure time do not directly relate to spatial resolution in the same way. Film speed pertains to the sensitivity of film to radiation, which affects exposure requirements but not the resolution capability of the image. Radiographic technique involves the selection of factors such as kVp and mAs, impacting the overall image quality and contrast, while exposure time affects the amount of radiation delivered but does not necessarily influence the spatial resolution achieved by pixel arrangement.