Contrast and Spatial Resolution Practice Test

Antiscatter grids reduce the amount of scattered X-ray photons that reach the image receptor by absorbing them with the grid’s lead strips while still letting primary photons pass through. This lowers fog on the image and increases contrast, making tissues and structures more visible. Because the grid also absorbs some of the primary photons, you need to increase the exposure (more technique) to maintain film density. They don’t eliminate scatter entirely, and they do cause a higher patient dose to compensate for the grid’s absorption.