What is necessitated by the use of grids to improve the radiographic image?

• A. A decrease in exposure
• B. No change in exposure
• C. An increase in exposure
• D. A change in imaging modality

Answer: (C)

Using grids in radiography improves the quality of the image by reducing the amount of scatter radiation that reaches the film or detector. Grids are designed to absorb scattered photons while allowing primary, unscattered rays to pass through. This enhances contrast and sharpness in the images, making important anatomical details clearer.

However, because grids absorb some of the primary photons as well, they necessitate an increase in exposure to compensate for this loss. Without adjusting the exposure, the overall image could become underexposed, leading to a loss of detail and diagnostic quality. Therefore, radiographers must be aware that using grids often requires an increase in exposure factors, such as time, milliamperage, or kilovoltage, to achieve optimal image quality while employing grid use.