Abstract:
A method for identifying a substance includes determining a first molecular interference function (MIF) for a first substance. The method also includes determining a second MIF for a second substance. The method further includes generating a residual MIF at least partially based on a comparison of the second MIF to the first MIF. The method also includes identifying the type of substance based on the residual MIF.
Abstract:
A system (10) for reducing a degradation effect on a signal is provided. The system includes an X-ray source (66) configured to generate X-rays (67), a reference object (113) configured to output scattered radiation (88, 89, 90, 91) upon receiving the X-rays, the reference object includes a material having an atomic number ranging from and including forty to sixty, and a detector (16, 18) configured to output an electrical signal by detecting the scattered radiation.
Abstract:
In one embodiment of a method of and apparatus for correcting for scatter, an object, which may be the jaw of a dental patient, is subjected to x-rays or other penetrating radiation. An intensity distribution of the transmitted radiation is detected. A first array of voxel data representing the absorption of the radiation by the object is reconstructed from the detected intensity. A radiation scatter pattern is calculated by forward projection from the first array using one or more point spread functions. The detected intensity is corrected using the calculated radiation scatter pattern. A second array of voxel data representing the absorption of the radiation by the object is reconstructed from the corrected detected intensity.
Abstract:
An apparatus comprises a neutron detector. The neutron detector comprises a conversion layer comprising a mixture of a neutron absorbing material and a scintillation material; and a photodetector optically coupled to the conversion layer and arranged to detect photons generated as a result of neutron absorption events in the conversion layer; wherein the apparatus is adapted to be carried by a user and the conversion layer is positioned within the neutron detector such that when the apparatus is being carried by a user in normal use neutrons are absorbed in the conversion layer after passing through the user such that the user's body provides a neutron moderating effect. In some cases the apparatus may be carried in association with a backpack or clothing worn by a user, for example, the neutron detector may be sized to fit in a pocket. In other cases the apparatus may be a hand-held device with the conversion layer arranged within a handle of the device to be gripped by a user when being carried.
Abstract:
A system (10,100) for improving an accuracy of identification of a substance is provided. The system (10,100) includes an X-ray source (64,66,68) configured to generate X-rays, a detector operatively coupled to the X-ray source, and configured to detect the X-rays and output an electrical signal (196,198,200,202,204,206,208,210,212) representative of the detected X-rays, and a processor (190) coupled to the detector and configured to determine whether a relative molecular interference function of the substance includes at least one peak (1056,1058,1060).
Abstract:
According to an aspect of the present invention, a correction of X-ray intensities measured in an energy-resolved diffraction method may be provided for multiple scattered radiation without any assumptions on the geometry of the object examined. According to an exemplary embodiment of the present invention, the characteristic lines of the anode material in the primary spectrum are evaluated, resulting in a component analysis of the detected spectrum which may allow for a correction for its multiple scatter part.
Abstract:
The present disclosure relates to a detection system and method. The detection system includes: a distributed radiation source (101) having a plurality of radiation source focus points, which emit rays to irradiate an object under detection, wherein the plurality of radiation source focus points are divided into a certain number of groups; a primary collimator (102) that limits rays of each of the radiation source focus points such that the rays emit into an XRD detection device; the XRD detection device (103) including a plurality of XRD detectors that are divided into the same number of groups as the radiation source focus points, wherein XRD detectors in a same group are arranged to be separated by XRD detectors in other groups, and rays of each of the radiation source focus points are merely received by XRD detectors having the same group number as the group number of the radiation source focus point.
Abstract:
An apparatus for inspecting objects utilizes a fan beam or flood beam to illuminate the inspected region of the object. A modulator, which may take the form of a movable mask, dynamically encodes the beam so that each segment of the inspected region receives varying amounts of radiation according to a predetermined temporal sequence. The resultant signal produced by a backscatter detector or optional transmission detector receiving radiation from the object is decoded to recover spatial information so that an image of the inspected region may be constructed.
Abstract:
A system (10) for identifying a substance (82) is provided. The system includes a first scatter detector (16) configured to detect a first set of scattered radiation (89, 90), a second scatter detector (18) configured to detect a second set of scattered radiation (88, 91), and a processor (190) configured to generate a first effective atomic number from the first set of scattered radiation, to generate a second effective atomic number from the second set of scattered radiation, and to determine (642) whether the first effective atomic number is within a limit of the second effective atomic number.
Abstract:
A system (10) for identifying a substance (82) is provided. The system includes a first scatter detector (16) configured to detect a first set of scattered radiation (89, 90), a second scatter detector (18) configured to detect a second set of scattered radiation (88, 91), and a processor (190) configured to generate a first effective atomic number from the first set of scattered radiation, to generate a second effective atomic number from the second set of scattered radiation, and to determine (642) whether the first effective atomic number is within a limit of the second effective atomic number.