The primary effect of scatter radiation on radiographic image quality is decreased:

The primary effect of scatter radiation on radiographic image quality is decreased contrast. Scatter radiation occurs when X-rays deviate from their original path after interacting with matter, such as tissues in the body. This scattered radiation can reach the imaging receptor, contributing to a more uniform exposure across the image.

When scatter radiation increases, it adds a layer of gray tones to the image instead of allowing for the clear differentiation between light and dark areas. This reduction in the differential absorption of the X-rays leads to less distinct edges and a washout of the fine details, ultimately lowering the contrast of the image. High contrast in radiography is essential for distinguishing between different tissues and structures, and scatter can interfere significantly with this by making the entire image appear more similar in brightness.

Other factors, such as receptor exposure, brightness, and spatial resolution, can also be affected by scatter radiation, but the most significant and direct impact is observed in the contrast of the image. By understanding this relationship, radiographers can apply various techniques, such as using grids or adjusting exposure parameters, to minimize scatter and maintain high-quality images with optimal contrast.