Lower spatial resolution may be caused by which factor?

Lower spatial resolution may be caused by which factor?

• A. Short OID
• B. Long SID
• C. Small focal spot
• D. Wide pixel pitch

Answer: (D)

Spatial resolution reflects how finely detail can be sampled and how sharp the image is in terms of geometric blur. In digital detectors, the sampling density is set by pixel pitch—the distance between neighboring pixel centers. A wider pixel pitch means fewer samples across a given area, so the system captures less high-frequency detail. That reduced sampling density lowers the ability to distinguish small structures, degrading spatial resolution. Other factors tend to improve resolution by reducing blur: a short object-to-image distance minimizes magnification and edge blur; a long source-to-image distance similarly reduces geometric unsharpness; a small focal spot lessens penumbra, sharpening edges. Because of this, the factor that would lead to lower spatial resolution is the wide pixel pitch.

Spatial resolution reflects how finely detail can be sampled and how sharp the image is in terms of geometric blur. In digital detectors, the sampling density is set by pixel pitch—the distance between neighboring pixel centers. A wider pixel pitch means fewer samples across a given area, so the system captures less high-frequency detail. That reduced sampling density lowers the ability to distinguish small structures, degrading spatial resolution.

Other factors tend to improve resolution by reducing blur: a short object-to-image distance minimizes magnification and edge blur; a long source-to-image distance similarly reduces geometric unsharpness; a small focal spot lessens penumbra, sharpening edges. Because of this, the factor that would lead to lower spatial resolution is the wide pixel pitch.