CAMRT Radiography Practice Exam

What determines the increase in spatial resolution in digital radiography systems?

1. Increased exposure time

2. Increased pixel density

3. Reduced image matrix

4. Lower field of view

The correct answer is: Increased pixel density

The increase in spatial resolution in digital radiography systems is primarily determined by increased pixel density. Spatial resolution refers to the ability of an imaging system to differentiate between two closely spaced objects, and higher pixel density means that there are more pixels in a given area of the image, allowing for finer detail to be recorded. When pixel density is increased, each pixel occupies a smaller portion of the image area, providing a higher level of detail and clarity. This enhancement allows practitioners to visualize and interpret more intricate structures within the radiographic images, ultimately leading to improved diagnostic capabilities. In contrast, while factors like exposure time can influence image quality, they do not directly enhance spatial resolution in the same manner that pixel density does. A reduced image matrix or lower field of view can limit the amount of information captured, which could also detract from the possible spatial resolution rather than enhance it. Therefore, increasing pixel density is the key factor that directly contributes to improving spatial resolution in digital radiography systems.