Cassette assembly for use with roentgen apparatus with automatic exposure control
AssigneeAgfa-Gevaert
InventorsRudy Van den Bergh, Jurgen Van Limbergen, Manfred Schmidt, Heinz Backhaus, Ernst Widemann
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Abstract
A cassette assembly comprising an X-ray cassette, with a tube side and a cover, and an intensifying screen wherein the cassette assembly further comprises a compensation element adapted to the intensifying screen so as to have a cassette assembly with predetermined X-ray absorption.
Claims15
A cassette assembly comprising an X-ray cassette, with a tube side and a cover, and an intensifying screen characterized that said cassette assembly further comprises a compensation element adapted to said intensifying screen so as to have a cassette assembly with predetermined X-ray absorption.
An X-ray intensifying screen comprising an opaque support carrying on one side a phosphor layer comprising a prompt emitting phosphor and on the other side of the support a layer containing an X-ray absorbing pigment selected from the groups consisting of alkaline earth compounds, Zn compounds, rare earth compounds, compounds comprising tungsten, compounds comprising tantalum, and titanium compounds.
A method for radiography, comprising the steps of
- providing a cassette with a front and back side containing an intensifying screen near said backside and an X-ray film with an emulsion layer in contact with said intensifying screen and a compensation element between said intensifying screen and said backside,
- exposing a patient, placed between an X-ray source and said front side of said cassette, by having said X-ray source emitting X-rays,
- registering an X-ray dose in a phototimer placed behind said backside of said cassette and
- having said phototimer end said exposure of said patient when a threshold X-ray dose has been absorbed by said phototimer.
Dependencies are inferred from the claim text.