Spatial resolution in digital radiography is defined as

Spatial resolution in digital radiography is defined as

• A. Amount of geometric distortion
• B. Total number of photons absorbed by the image receptor
• C. Structural sharpness recorded in the radiograph
• D. Total number of brightness levels

Answer: (C)

Spatial resolution is about how well the image can distinguish small structures and edges. In digital radiography, high spatial resolution means sharp, well-defined details and the ability to separate closely spaced features. This sharpness depends on factors like detector pixel size, sampling, the system’s modulation transfer function, and geometric factors such as focal spot size and motion. A small focal spot and fine detector pixels improve resolution, while a large focal spot or motion blur degrade it. Distortion relates to the accurate geometric representation of object size and shape, not the level of detail. The number of photons absorbed affects brightness and noise, not sharpness. The number of brightness levels or gray shades affects dynamic range, not spatial detail. So the best description of spatial resolution is the structural sharpness recorded in the radiograph.

Spatial resolution is about how well the image can distinguish small structures and edges. In digital radiography, high spatial resolution means sharp, well-defined details and the ability to separate closely spaced features. This sharpness depends on factors like detector pixel size, sampling, the system’s modulation transfer function, and geometric factors such as focal spot size and motion. A small focal spot and fine detector pixels improve resolution, while a large focal spot or motion blur degrade it.

Distortion relates to the accurate geometric representation of object size and shape, not the level of detail. The number of photons absorbed affects brightness and noise, not sharpness. The number of brightness levels or gray shades affects dynamic range, not spatial detail. So the best description of spatial resolution is the structural sharpness recorded in the radiograph.