X-ray film changer for serial radiography

Radiant energy – Invisible radiation responsive nonelectric signalling – Luminescent device

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Details

250468, G03D 1308, G03D 1310

Patent

active

040829561

ABSTRACT:
A serial radiograph system has an improved film changer featuring reusable film pack containers. An exposure station through which X-rays are directed is virtually free of X-ray absorbing material providing a "see through" station. As a consequence of the "see through" exposure station, an image intensification tube positioned under the exposure station provides an unobstructed fluoroscopic image with minimum X-ray dosage to a patient.
The film changer utilizes film packs, each of which has a semienclosed, partially sealed, pouch. Each pouch contains a sheet of radiographic film between a pair of intensifying screens. A plurality of the film packs are stacked in a novel supply magazine and are sequentially transported to the exposure station by a transport system having a plurality of pinch roll pairs. An evacuator pinch roll pair causes uniform engagement of the screens with the film as the film pack is transported into the exposure station by exhausting the air from the pouch and creating a vacuum as it passes through the rolls. The rolls then clamp unsealed edges of the pouch in releasably sealing contact during X-ray exposure of the film for maintaining the engagement of the film and the screens by maintaining the vacuum.

REFERENCES:
patent: 3348042 (1967-10-01), Umberg et al.
patent: 3569700 (1971-03-01), Quinn
patent: 3860826 (1975-01-01), Somerset

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