Signal-to-noise ratio (SNR) is increased whenever:

In the context of digital radiography, an increased signal-to-noise ratio (SNR) is desirable as it enhances the quality of the image by improving the visibility of the anatomical structures of interest against the background noise.

When radiographic grids are utilized, they help to absorb scattered radiation that can contribute to image noise. By reducing the amount of scatter reaching the detector, grids effectively increase the proportion of useful signal to unwanted noise, thereby improving the SNR. This allows for clearer and more diagnostic images, as the contrast between different tissue densities becomes more pronounced.

While other factors like film speed, scattering, and mAs also play roles in SNR, the specific action of integrating a grid directly targets the reduction of scatter, which is a key source of noise in radiographic images. Therefore, implementing grids is a strong strategy for improving SNR in imaging processes.