Active energy selective x-ray image detection
First Claim
1. Energy discriminating radiation detector apparatus for selectively recording two sequentially incident fluxes of x-ray radiation, said apparatus comprising:
- (a) two planar screen x-ray radiation detectors arranged parallel to each other,(b) controller means for controlling the response of said detectors,(c) sequencer means for synchronizing the controlled response of said detectors with said sequentially incident fluxes of x-ray radiation,wherein detector response of each of said detectors to a predetermined energy spectrum is selectively enhanced.
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Abstract
An apparatus and method for energy selective x-ray image detection. A source produces two fluxes of x-ray radiation with two different energy spectra. The fluxes are sequentially incident on the subject then on two layered planar detectors with control means. Examples of planar detectors are stimulable phosphor screens or intensifying screen/photographic film detectors. Examples of control means are visible light sources or electric generators with stimulable phosphor screens or light valves with intensifying screen/film detectors. A sequencer uses control means to selectively enhance the response of a predetermined detector to corresponding sequential radiation flux. The predetermined response can be chosen to enhance the inherent energy selectivity of the layered detector e.g. the first detector preferentially responds to low energy while the second detector preferentially responds to high energy x-ray photons. Planar detectors are used so that the layered detector fits in a cassette compatible with film cassettes used in medical radiography.
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Citations
12 Claims
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1. Energy discriminating radiation detector apparatus for selectively recording two sequentially incident fluxes of x-ray radiation, said apparatus comprising:
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(a) two planar screen x-ray radiation detectors arranged parallel to each other, (b) controller means for controlling the response of said detectors, (c) sequencer means for synchronizing the controlled response of said detectors with said sequentially incident fluxes of x-ray radiation, wherein detector response of each of said detectors to a predetermined energy spectrum is selectively enhanced. - View Dependent Claims (2, 3, 4, 5)
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6. An imaging method comprising the steps of:
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(a) directing two fluxes of x-ray radiation sequentially through an object to be imaged, said fluxes having different energy spectra; (b) detecting x-ray radiation emergent from said object by a radiation detector comprising; two planar screen detectors arranged parallel to each other, means for controlling the response of said detector, sequencer means for synchronizing the controlled response of said planar screen detectors with said x-ray radiation emergent from said object; (c) controlling the response of said planar screen detectors so the response of a predetermined planar screen detector to each of the fluxes of x-ray radiation is selectively enhanced; (d) reading data from said planar screen detectors; and
,(e) processing said data to produce a representation of the internal structure of said object. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification