Pixel malfunction within a digital radiography image receptor is likely to manifest on a radiograph as which artifact?

Pixel malfunction within a digital radiography image receptor is likely to manifest on a radiograph as which artifact?

• A. Hyperdense artifact
• B. Loss of contrast
• C. Loss of spatial resolution
• D. Geometric distortion

Answer: (A)

Pixel malfunctions in a digital radiography receptor show up as bright spots on the image because a defective detector element can output a higher-than-expected signal, creating a fixed high-intensity (hyperdense) spot that does not correspond to actual anatomy. This localized bright artifact arises from a dead or stuck pixel and stands out against surrounding tissue, even when exposure is otherwise appropriate. This differs from loss of contrast, which changes the overall differentiation between light and dark across the entire image, not as a single spot. Loss of spatial resolution would blur fine details and edges rather than produce a discrete bright pixel. Geometric distortion would warp the shape or position of anatomy across the image. So the isolated pixel issue most consistently presents as a hyperdense artifact.

Pixel malfunctions in a digital radiography receptor show up as bright spots on the image because a defective detector element can output a higher-than-expected signal, creating a fixed high-intensity (hyperdense) spot that does not correspond to actual anatomy. This localized bright artifact arises from a dead or stuck pixel and stands out against surrounding tissue, even when exposure is otherwise appropriate.

This differs from loss of contrast, which changes the overall differentiation between light and dark across the entire image, not as a single spot. Loss of spatial resolution would blur fine details and edges rather than produce a discrete bright pixel. Geometric distortion would warp the shape or position of anatomy across the image. So the isolated pixel issue most consistently presents as a hyperdense artifact.