Selective image area control of x-ray film exposure density

Details Selective image area control of x-ray film exposure density Selective image area control of x-ray film exposure density

Filed on

1976-04-09

Date issued

1977-12-13

Examiner

Chatmon, Jr., Saxfield

Patent Class

Radiant energy

SubClass

Automatic/serial detection of similar sources

Other Related Categories

250416TV, G03B 4116

Type

Patent

Status

active

Patent number

040630927

Description

ABSTRACT:
A system for accurately determining the exposure density required for x-ray photography of a particular area of interest is provided. The light received from an x-ray image intensifier is applied to a beam splitting mirror which divides the light between a motion picture film camera and a television film camera. Between the beam splitter and the motion picture film camera, there is positioned another light beam splitter to direct some of the light at a mask having an opening which encloses only the image area of interest. Behind that opening there is positioned a photomultiplier intensity sensor for determining the exposure required and varying x-ray beam intensity accordingly.

REFERENCES:
patent: 3126480 (1964-03-01), Bouwers
patent: 3439114 (1969-04-01), Taylor
patent: 3546461 (1970-12-01), Craig
Hewlett-Packard Journal, "An Automatic Exposure Control for Lab-Bench X-Ray Camera", Brewster, vol. 25, No. 11, July 1974, pp. 20-24.

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