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1.发明授权公开(公告)号：US10416098B2
公开(公告)日：2019-09-17
申请号：US15604530
申请日：2017-05-24
IPC分类号： G01N23/04 , G01N23/046 , G06T11/00 , G01N23/203 , G06T7/00
摘要： A method for image reconstruction includes irradiating an object with a beam of radiation from a radiation source, measuring an attenuated portion of the beam, estimating a density of the object, determining a predicted attenuated portion of the beam using the density estimate, and iteratively adjusting the density estimate of the object. The predicted attenuated portion and the measured attenuated portion are compared to determine a signal difference. The density estimate of each portion of the object is adjusted by scaling the density estimate using the average signal differences of rays that intersect the portion of the object. The density estimate may be repeatedly adjusted until a difference between consecutive density estimates is below a selected threshold or a predetermined number of adjustments have been completed. The attenuated portion of the beam may include a scattered portion and a transmitted portion.
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公开(公告)号：US10714227B2
公开(公告)日：2020-07-14
申请号：US15615055
申请日：2017-06-06
发明人： Charles Wayne Aaron , Shuang Cui , Michael John Liesenfelt , Paul Daniel Ridgeway , James Edward Baciak , Jeb Everett Belcher
摘要： A shutter for controlling radiation exposure includes a rotatable member. The rotatable member is rotatable between an open position and a closed position. The rotatable member includes a passageway, wherein the passageway is positioned to receive radiation in the open position and is not positioned to receive radiation in the closed position. In the closed position, the rotatable member may substantially block or absorb the radiation. The passageway may collimate the radiation into a beam of radiation. The rotatable member may include a plurality of passageways positioned to receive radiation in the open position. The rotatable member may be rotatable between a plurality of open positions, each open position corresponding to at least one passageway. The open positions may align the source of radiation with different passageways in the rotatable member to form a different beam shape, a different number of beams, a different beam direction, or combinations thereof.
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公开(公告)号：US10151716B2
公开(公告)日：2018-12-11
申请号：US15228481
申请日：2016-08-04
发明人： Jeb E. Belcher , Gregory Thomas Grissom , James Edward Baciak , Kelly Alexander Jordan , Jyothier Nimmagadda , Shuang Cui , Michele Viola Manuel
IPC分类号： G01N23/204 , B61K9/10 , G01N23/203 , G01N33/20 , G01T3/00 , G01N9/24
摘要： An internal imaging system has a radiation source and a plurality of detectors positioned to receive portions of the plurality of collimated beams that have been attenuated by interaction with the target. The radiation source is configured to irradiate a target with a plurality of collimated beams of radiation. Two of the plurality of collimated beams of radiation may have different beam shapes. Another internal imaging system includes a radiation source configured to irradiate a target with at least one collimated beam of radiation and at least one detector. A planar rotating collimator is positioned adjacent to the radiation source and is configured to form the at least one collimated beam. The at least one detector is positioned to receive attenuated portions of the at least one collimated beam. The radiation source may be or include a neutron source. The detectors may be or include a plurality of neutron converters.
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