Device for detecting information contained in a phosphor layer
AssigneeAgfa-Gevaert HealthCare GmbH
InventorsAndreas Bode, Georg Reiser
Life of this patent
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Abstract
Device for detecting information which is contained in a phosphor layer, with multiple individual radiation sources for emitting stimulation light incident upon the phosphor layer along a stimulation line and suitable for stimulating emission light in the phosphor layer, and a detector for detecting the emission light which is stimulated in the phosphor layer. To ensure the highest possible quality of the detected image, an elongated concave mirror is provided, for focusing the stimulation light emitted by the individual radiation sources onto the phosphor layer.
Claims11
Device for detecting information which is contained in a phosphor layer, comprising:
- multiple individual radiation sources for emitting stimulation light incident upon the phosphor layer along a stimulation line and suitable for stimulating emission light in the phosphor layer,
- a detector for detecting the emission light which is stimulated in the phosphor layer, and
- an elongated concave mirror for focusing the stimulation light emitted by the individual radiation sources onto the phosphor layer,
- wherein the concave mirror has an optical axis in a plane of a cross-section of the concave mirror and said optical axis cuts the concave mirror in a vertex (S),
- wherein the radiation sources are tilted by a tilt angle (ω) around the vertex (S) relative to the optical axis of the concave mirror, and
- wherein there is a distance (d) between the radiation sources and/or the stimulation line on the one hand and the vertex (S) on the other hand, said distance (d) running along said optical axis in the plane of the cross-section of the concave mirror and satisfying the relationship d=R cos2ω, where R designates a radius of curvature of the concave mirror.
Device for detecting information which is contained in a phosphor layer, comprising:
- multiple individual radiation sources for emitting stimulation light incident upon the phosphor layer along a stimulation line and suitable for stimulating emission light in the phosphor layer,
- a detector for detecting the emission light which is stimulated in the phosphor layer, and
- a single elongated concave mirror for focusing the stimulation light emitted by the individual radiation sources onto the phosphor layer with no other concave mirrors being used between the individual radiation sources and the phosphor layer,
- wherein the concave mirror has an optical axis in a plane of a cross-section of the concave mirror and said optical axis cuts the concave mirror in a vertex (S),
- wherein the radiation sources are tilted by a tilt angle (ω) around the vertex (S) relative to the optical axis of the concave mirror, and
- wherein there is a distance (d) between the radiation sources and/or the stimulation line on the one hand and the vertex (S) on the other hand, said distance (d) running along said optical axis in the plane of the cross-section of the concave mirror and satisfying the relationship d =R cos2ω, where R designates a radius of curvature of the concave mirror.
A method for detecting information which is contained in a phosphor layer, the method comprising:
- providing a concave mirror with an optical axis in a plane of a cross-section of the concave mirror, the optical axis cutting the concave mirror in a vertex,
- tilting a source of stimulation light by a tilt angle around the vertex relative to the optical axis of the concave mirror,
- setting a distance between the source of stimulation light and/or stimulation line measured along the optical axis of the concave mirror to be proportional to the square of the cosine of the tilt angle;
- generating the stimulation light and focusing the stimulation light with the concave mirror onto the phosphor layer to form the stimulation line and stimulating emission light in the phosphor layer, and
- detecting the emission light which is stimulated in the phosphor layer.
Dependencies are inferred from the claim text.