What is the primary consequence of using a larger focal spot size in radiographic imaging?

The primary consequence of using a larger focal spot size in radiographic imaging is that it leads to decreased image detail. The focal spot size impacts the sharpness and resolution of the radiographic image; a smaller focal spot produces finer detail due to the reduced penumbra, which is the area of unsharpness around the edges of the image.

When the focal spot is larger, the penumbra increases, causing more blurriness and a loss of definition in the radiograph. This blurring can obscure small features and lead to difficulties in accurately interpreting the image. Thus, images produced with a larger focal spot size often lack the clarity needed for precise diagnosis, making it essential to select an appropriate focal spot size based on the required detail of the image.