CAMRT Radiography Practice Exam

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What grid error is indicated by an image being light on one side and dark on the other?

Off-center error
Off-focus error
Off-axis error
Off-distance error

The correct answer is: Off-center error

An image that exhibits varying densities, specifically being light on one side and dark on the other, indicates an off-center error. This type of grid error occurs when the central beam of radiation is misaligned in relation to the focused grid. Grids are designed to absorb scatter radiation while allowing primary radiation to pass through. When the x-ray beam is not centered properly, typically within the grid's focal range, it results in a part of the image receiving less exposure due to the grid’s interference with the primary rays. In this scenario, the central portion of the image may appear well exposed, while the edges may be underexposed, leading to the characteristic light and dark discrepancies noted. Proper centering is crucial to ensure that the x-ray beam is optimally aligned with the grid to produce an even and clear image. Understanding this concept is vital for radiographers to achieve diagnostic-quality images while minimizing artefacts introduced by improper grid usage.