Device for measuring local radiation absorption in a body
First Claim
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1. A device for measuring the spatial distribution of radiation absorption in a body, comprising:
- a multiplicity of radiators regularly distributed about a circle of diameter sufficient to surround said body, each radiator emitting a wedge-shaped beam of radiation in the plane of said circle toward a different arc portion of said circle between two other radiators; and
a multiplicity of adjoining detectors in each of said different arc portions of said circle to measure radiation from the associated radiator emitting radiation thereto, each detector having only a comparatively small effective measuring field, the spatial distribution being calculated from the measured radiation values from said detectors.
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Abstract
A device for measuring the spatial distribution of radiation absorption in a body wherein a multiplicity of radiators are regularly distributed about a circle surrounding the body, each radiator emitting a wedge-shaped beam of radiation in the plane of the circle toward a different arc portion of the circle beween two other radiators, a multiplicity of adjoining detectors in each arc portion measuring radiation from the radiator emitting radiation to that arc portion, the spatial distribution of radiation absorption being calculated from the measured radiation values of all the detectors.
65 Citations
4 Claims
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1. A device for measuring the spatial distribution of radiation absorption in a body, comprising:
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a multiplicity of radiators regularly distributed about a circle of diameter sufficient to surround said body, each radiator emitting a wedge-shaped beam of radiation in the plane of said circle toward a different arc portion of said circle between two other radiators; and a multiplicity of adjoining detectors in each of said different arc portions of said circle to measure radiation from the associated radiator emitting radiation thereto, each detector having only a comparatively small effective measuring field, the spatial distribution being calculated from the measured radiation values from said detectors. - View Dependent Claims (2, 3)
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4. An apparatus for examining a body by means of penetrating radiation including a source means arranged to irradate the body with a planar spread of said radiation, detector means arranged to detect the radiation to provide output signals, relating to absorption of the radiation by the body, for processing to provide a representation of the distribution of absorption in a substantially planar section of the body and means adapted to scan the planar spread of radiation in relation to the body so as to irradate said section along a plurality of beam paths passing through the body from a plurality of direction, wherein said detector means comprises a plurality of detector devices of which a predetermined number are irradiated by said spread at any time and wherein the scanning means is arranged to traverse the spread of X-rays along the detector device so as to change the irradiated device progressively. .Iaddend. .Iadd.5. An apparatus according to claim 4 wherein the scanning means include means adapted to move said source means in relation to the body to provide at least part of the scanning of said spread of radiation. .Iaddend. .Iadd.6. An apparatus according to claim 4 including means adapted to move said detector means relative to the body. .Iaddend. .Iadd.7. An apparatus according to claim 4 in which the scanning means include means adapted to provide at least a rotational motion of said spread of radiation relative to the body. .Iaddend. .Iadd.8. An apparatus according to claim 4 including collimator means adapted to restrict the number of said detector devices irradiated at any time. .Iaddend. .Iadd.9. An apparatus according to claim 8 including means for moving the collimator means in relation to the detector means to change the detector devices so irradiated. .Iaddend.
Specification