X-ray field defining masks for a spot film device

Details X-ray field defining masks for a spot film device X-ray field defining masks for a spot film device

1976-11-10

1978-07-04

Willis, Davis L.

Radiant energy

Radiation controlling means

Shields

250511, G21F 504

Patent

active

040990630

ABSTRACT:
In a spot film device, the inner and main carriages for a film cassette are positioned with reversible servo motors. An x-ray grid is mounted on the bottom of the main carriage and a cross grid is mounted on tracks beneath the carriage such that the cross grid may be used or not used for fluoroscopy and both grids may be used for radiography. Field defining masks are also mounted for translating selectively with the carriage. Individual reversible servo motor drives are used to advance and retract the masks and cross grid. Means are provided for absorbing shock or negating drive system momentum when the masks or grid are stopped abruptly. Reduced power is applied to the mask and grid drive motors when the masks and grid reach their stops for holding them against their stops. A motor driven palpator cone, having unique driving and locking means is provided. Means are provided for loading and unloading cassettes from either the front or rear of the spot film device.

REFERENCES:
patent: 2881329 (1959-04-01), Peyser
patent: 2959680 (1960-11-01), Green

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