Source image distance
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SmackBot
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Date/fix the maintenance tags or gen fixes
{{Unreferenced|date=October 2007}}
'''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 It has recently been superseded due to the replacement of film with computed radiography or direct digital radiography detectors.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 image distance''' (SID); focus image distance (FID); source receptor distance (SRD); and focus receptor distance (FRD). SID seems to be the most common - perhaps as it was already in use as a term in [[fluoroscopy]] to describe source intensifier distance.
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