What effect does off-level grid error have on an x-ray image?

Off-level grid error occurs when the grid used in radiography is not properly aligned with the X-ray beam. This misalignment affects how X-rays interact with the grid and can lead to uneven exposure on the resulting image.

When an off-level grid error happens, it typically causes decreased density on one side of the radiographic image. This is due to the grid's inability to effectively absorb scattered radiation uniformly across the image. As a result, one side may receive more scattered radiation or less direct exposure, leading to a noticeable decrease in the overall density of that side. The remaining parts of the image may appear adequately exposed, highlighting the contrast between the affected and unaffected areas.

Understanding this effect is crucial for radiographers as it emphasizes the importance of proper grid alignment to ensure a uniform appearance and optimal diagnostic quality in X-ray images.