Which method can reduce the quantity of scattered radiation reaching the image receptor (IR)?

The method that effectively reduces the quantity of scattered radiation reaching the image receptor is utilizing a stationary grid. A stationary grid is a device that consists of a series of radiopaque strips interspaced with radiolucent material and is placed between the patient and the image receptor. The purpose of the grid is to absorb scattered radiation before it can reach the image receptor, thereby enhancing the quality of the image by reducing fog and improving contrast. This allows for clearer imaging by minimizing the unwanted effects of scatter.

The other methods, while relevant in the context of imaging, do not primarily focus on reducing scattered radiation in the same direct manner as a stationary grid. For instance, using a fast imaging system can reduce the overall exposure time, which can indirectly lead to reductions in scatter if less radiation is used, but it does not actively prevent scatter from reaching the IR. Similarly, implementing an air gap can minimize scatter radiation, but it's more about the spatial separation that allows the scatter to diverge from the IR rather than actively absorbing it. The stationary grid, therefore, stands out as the most effective method specifically designed for this purpose.