Method for examining a body with penetrating radiation
First Claim
1. In a device for examining a body using penetrating radiation which comprises:
- source means which generate a primary beam of said radiation, detector array means for measuring, and for generating output signals representing, scattered radiation generated in the body along the primary beam, diaphragm means disposed between the detector array means and the primary beam which define a slit shaped aperture having a longitudinal direction which is oriented at right angles to the primary beam; and
a large plurality of lamellae of radiation-absorbing material disposed between the aperture and the detector array means which lamellae are disposed at least approximately in planes which intersect colinearly in and along the primary beam whereby the detector array means measure radiation which is both singly and multiply scattered in the body;
the improvement which comprises;
means for generating a relative displacement between the primary beam and the diaphragm means, the detector array means, and the lamellae so that, during a portion of the examination, the planes of the lamellae intersect outside of the primary beam whereby the detector array means only measure radiation which is multiply scattered in the body; and
means which subtract output signals from the detectors which represent only said multiply scattered radiation from respective output signals which represent both singly and multiply scattered radiation to produce signals which represent only singly scattered radiation.
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Accused Products
Abstract
Devices that measure the electron density in a body by means of radiation scattered from a narrow pencil beam of penetrating radiation directed through the body, produce defective images on reconstruction of the density distribution because of multiple scattering of radiation. This can of course be reduced by scattered ray diaphragms, but cannot be eliminated entirely. The invention therefore provides a means for detecting the size of the multiple scattered radiation component be measurement. For this purpose, the detector array which measures radiation including the single scattered radiation, is screened, at least osscasionally, from the single scattered radiation and the detected intensity values measured by the detector elements when so screened, are used to correct the values generated by measuring the detected radiation including the single scattered radiation.
78 Citations
4 Claims
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1. In a device for examining a body using penetrating radiation which comprises:
- source means which generate a primary beam of said radiation, detector array means for measuring, and for generating output signals representing, scattered radiation generated in the body along the primary beam, diaphragm means disposed between the detector array means and the primary beam which define a slit shaped aperture having a longitudinal direction which is oriented at right angles to the primary beam; and
a large plurality of lamellae of radiation-absorbing material disposed between the aperture and the detector array means which lamellae are disposed at least approximately in planes which intersect colinearly in and along the primary beam whereby the detector array means measure radiation which is both singly and multiply scattered in the body;
the improvement which comprises;means for generating a relative displacement between the primary beam and the diaphragm means, the detector array means, and the lamellae so that, during a portion of the examination, the planes of the lamellae intersect outside of the primary beam whereby the detector array means only measure radiation which is multiply scattered in the body; and means which subtract output signals from the detectors which represent only said multiply scattered radiation from respective output signals which represent both singly and multiply scattered radiation to produce signals which represent only singly scattered radiation. - View Dependent Claims (2, 3, 4)
- source means which generate a primary beam of said radiation, detector array means for measuring, and for generating output signals representing, scattered radiation generated in the body along the primary beam, diaphragm means disposed between the detector array means and the primary beam which define a slit shaped aperture having a longitudinal direction which is oriented at right angles to the primary beam; and
Specification