How does an incorrectly positioned grid affect an image?

An incorrectly positioned grid can lead to grid cut-off, which occurs when the beams of radiation do not pass through the grid properly due to misalignment. A grid is designed to prevent scatter radiation from reaching the image receptor, thus improving image contrast. However, if the grid is misaligned, certain areas of the image may receive insufficient radiation, leading to darker, poorly defined regions or streaks across the radiograph. This reduces overall image quality and detail, as the intended benefits of the grid are compromised.

The distortion caused by grid cut-off can make areas of the image appear underexposed or significantly altered, making it harder for radiologists to accurately interpret the results. Correct positioning of the grid is crucial to ensure that it effectively enhances the image by allowing the primary radiation to strike the image receptor while attenuating scatter. This clear understanding of how improper grid positioning impacts image quality is essential for correct radiographic technique and diagnostic accuracy.