Optical masking radiography

Details Optical masking radiography Optical masking radiography

1979-11-09

1982-03-30

Smith, Alfred E.

Radiant energy

Automatic/serial detection of similar sources

250505, G03B 4116

Patent

active

043226191

ABSTRACT:
A first x-ray film is made of an object which is of the type where the image on the film has underexposed portions with low optical contrast. An optical mask film is made from the first x-ray film by transferring the image of the object from the first x-ray film onto a photographically positive print film with duplicating means and an optical blurring means to produce an optically blurred positive image reflective of the object with exposed portions related to the underexposed portions of the first x-ray film. A second x-ray film is made of the object with the optical mask film positioned and registered with respect to the second x-ray film and with respect to the image reflective of the object to be formed on the second x-ray film by the x-ray means, to produce an optically masked image reflective of the object with the underexposed portions of the first x-ray film on the second x-ray film more exposed and with higher optical contrast with respect to the first x-ray film.

REFERENCES:
patent: 2379814 (1945-07-01), McFarland
patent: 3121792 (1964-02-01), Mittelstaedt
patent: 3486022 (1969-12-01), Matuda et al.

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