X-ray or gamma ray systems or devices – Auxiliary data acquisition or recording
Patent
1992-07-20
1994-04-26
Porta, David P.
X-ray or gamma ray systems or devices
Auxiliary data acquisition or recording
378165, 378166, H05G 128
Patent
active
053073975
ABSTRACT:
The present invention provides an X ray film cassette with a permanent marking means for identifying the side of the radiographic film that faced the X ray tube during exposure. Such identification does not require any action by the X ray technologist, eliminating the element of human error. The marking means is comprised of chirally asymmetric X ray opaque and/or light-opaque letters or markings permanently mounted in the film cassette to intersect overlapping portions of an X ray path projected during exposure.
REFERENCES:
patent: 4698836 (1987-10-01), Minasian
patent: 5070248 (1991-12-01), Pesce
patent: 5086445 (1992-02-01), Fisher et al.
patent: 5189689 (1993-02-01), Fabian
Buff Ernest D.
Chu Kim-Kwok
Porta David P.
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