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foci |
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focus [fo´kus] (pl. fo´ci) (L.)
1. the point of convergence of light rays or sound waves. 2. the chief center of a morbid process. Ghon focus the primary parenchymal lesion of primary pulmonary tuberculosis in children; when associated with a corresponding lymph node focus, it is known as the primary or Ghon complex. Called also Ghon tubercle. grid focus in radiology, a determination made by drawing an imaginary line from the outside of the width of the grid to where it intersects with a centering point. Called also grid radius.
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