How does the introduction of a grid typically affect radiation dose?

The introduction of a grid in radiographic imaging increases the dose primarily due to the need for higher milliampere-seconds (mAs) to maintain image quality. Grids are used to reduce the amount of scatter radiation that reaches the detector, thus improving the contrast of the image. However, because grids absorb some of the primary radiation meant for the imaging process, an increase in radiation dose is often necessary to ensure that enough useful radiation reaches the detector for adequate image quality.

When a grid is employed, the technologist typically compensates for the reduction in the amount of radiation that directly impacts the imaging receptor by increasing the exposure parameters, particularly mAs. This results in a higher overall radiation dose to the patient. Therefore, while grids enhance the quality of the resulting images by minimizing scatter, they also lead to an increase in radiation dose due to the adjustments needed in the imaging settings.