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focus-film distance (FFD),
in radiography, the distance between the source of x-rays and the film.
Farlex Partner Medical Dictionary © Farlex 2012
focus-film distanceAbbreviation: FFD
In radiography, an obsolete term for source-to-image receptor distance.Synonym: focal-film distance See: source-to-image receptor distance
See also: distance
Medical Dictionary, © 2009 Farlex and Partners