Which statement correctly identifies a common DR artifact and its mitigation?

• A. Motion artifacts — mitigated by increasing exposure time.
• B. Grid aliasing — mitigated by using proper grid alignment and high-frequency grids.
• C. Underexposure — mitigated by decreasing technique with AEC or manual technique and reviewing EI.
• D. Grid artifacts — mitigated by using lower grid ratio.

Answer: (B)

In DR imaging, a common issue is grid aliasing, a moiré-like pattern that can appear when the grid’s lines interact unfavorably with the detector’s sampling. The best way to prevent this is to keep the grid properly aligned with the image receptor and to use a higher-frequency grid. A grid that is centered and correctly positioned reduces unwanted interference, and a high-frequency grid has finer lines that are less likely to produce visible aliasing on the image.

Motion artifacts would be minimized by shortening exposure time or using immobilization rather than increasing exposure time, since longer exposures tend to blur moving structures. Underexposure is addressed by increasing technique and/or adjusting the exposure index (EI), not by decreasing technique. Grid artifacts are not reliably mitigated simply by using a lower grid ratio; proper alignment and appropriate grid frequency are the more effective controls.