focal-film distance

(redirected from Source-to-Image Distance)
Also found in: Acronyms.

fo·cal-film dis·tance

(FFD) (fōkăl film distăns)
The distance from the source of radiation (the focal spot of the x-ray tube) to the film or other image-receptor.
Synonym(s): source-to-image distance.

fo·cal-film dis·tance

(FFD) (fōkăl film distăns)
The distance from the source of radiation (the focal spot of the x-ray tube) to the film or other image-receptor.
Synonym(s): source-to-image distance.

focal-film distance,

distance

the measure of space intervening between two objects or two points of reference.

critical distance
focal-film distance
the distance between the anode of the x-ray tube and the film; an important exposure value.
flight distance
guard distance
interocclusal distance
the distance between the occluding surfaces of the maxillary and mandibular teeth with the mandible in physiological rest position.
interocular distance
the distance between the eyes, usually used in reference to the interpupillary distance (the distance between the two pupils when the visual axes are parallel).
References in periodicals archive ?
A cylinder cone can be used to improve image quality, and the recommended source-to-image distance is 40 to 44 inches.
Each radiograph was produced by pointing the primary beam directly at a single lead apron at a source-to-image distance (SID) of either 40 or 72 inches, with a cassette placed directly behind the apron.
69 [micro]Gy (1 mR) at 80 kVp with a source-to-image distance (SID) of 1.
In this investigation, we studied the fading of the latent image during processing delay by exposing one image plate at 80 kVp at a source-to-image distance of 81 cm and at approximately 12.
The lateral knee radiograph was taken using a 42-inch source-to-image distance (SID) and a nongrid technique of 6 mAs at 66 kVp.
The source-to-image distance was 305 cm, and the technique factors for the examinations were 110 kVp and 300 mA with automatic exposure control.