Focus film distance (FFD) is the distance between the X-ray source and the film in diagnostic radiography. It has recently been superseded due to the replacement of film with computed radiography or direct digital radiography detectors. There are now various possible alternatives: source to image-receptor distance (SID); focus image distance (FID); source receptor distance (SRD); and focus receptor distance (FRD).
Famous quotes containing the words focus, film and/or distance:
“If we focus mostly on how we might have been partly or wholly to blame for what might have been less than a perfect, problem- free childhood, our guilt will overwhelm their pain. It becomes a story about us, not them. . . . When we listen, accept, and acknowledge, we feel regret instead, which is simply guilt without neurosis.”
—Jane Adams (20th century)
“The woman’s world ... is shown as a series of limited spaces, with the woman struggling to get free of them. The struggle is what the film is about; what is struggled against is the limited space itself. Consequently, to make its point, the film has to deny itself and suggest it was the struggle that was wrong, not the space.”
—Jeanine Basinger (b. 1936)
“The Russians imitate French ways, but always at a distance of fifty years.”
—Stendhal [Marie Henri Beyle] (1783–1842)