Focal spot
TechnicalArea of the X-ray tube anode from which the X-ray beam is emitted. Modern tubes have two focal spots: large (for high-mAs examinations) and small (for high resolution). Smaller focal spots produce geometrically sharper images.
Go beyond the definition
With Rad Index you study with flashcards, browse all 147 full projections and the ALARA checklist — even offline, on the ward.
