The focal spot size refers to the area on the anode of an X-ray tube where electrons collide to generate X-rays. This dimension significantly influences image resolution.
While standard X-ray tubes are suitable for general imaging, they may cause image blurring (penumbra) during magnified observation. Therefore, when inspecting small components at high magnification, a microfocus X-ray tube with a minute focal spot is essential to ensure sharp, clear images.
For more information, please see the technical column "What is Microfocus X-ray Technology? (Basic Knowledge)"
and the article regarding X-ray focus in CT imaging.
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