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71.发明申请公开(公告)号：US20200168426A1
公开(公告)日：2020-05-28
申请号：US16627527
申请日：2018-06-01
Applicant: Nuctech Company Limited , TSINGHUA UNIVERSITY
Inventor： Chengjun TAN , Wenhui HUANG , Chuanxiang TANG , Qingxiu JIN , Dongsheng ZHANG , Qun LUO , Donghai LIU , Luming ZHANG , Peidong WU
Abstract: An anode target comprises: a plurality of target structures, used for receiving an electron beam emitted by a cathode to generate a ray, the plurality of target structures being of three-dimensional structures having bevels; a copper cooling body, used for bearing the target structures and comprising an oxygen-free copper cooling body; a cooling oil tube, used for cooling the anode target; and a shielding layer, used for achieving a shielding effect and comprising a tungsten shielding layer. The anode target, the ray light source, the computed tomography scanning device, and the imaging method in the present application are able to enable all target spots on the anode target to be distributed on a straight line, imaging quality of a ray system is improved, and complexity of an imaging system is reduced.
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公开(公告)号：US20200154553A1
公开(公告)日：2020-05-14
申请号：US16612783
申请日：2018-05-30
Applicant: KONINKLIJKE PHILIPS N.V.
Inventor： ANAND KUMAR DOKANIA , ROLF KARL OTTO BEHLING
Abstract: The present invention relates to an apparatus (10) for generating X-rays. It is described to produce (210) with at least one power supply (40) a voltage between a cathode (20) and an anode (30). The cathode is positioned relative to the anode, and the cathode and anode are operable such that electrons emitted from the cathode interact with the anode with energies corresponding to the voltage, and wherein the electrons interact with the anode at a focal spot to generate X-rays. The at least one power supply provides (220) the cathode with a cathode current. An electron detector (50) is positioned (230) relative to the anode, and a backscatter electron signal is measured (240) from the anode. The measured backscatter electron signal is provided (250) to a processing unit (60). The processing unit determines (260) a cathode current correction and/or a correction to the voltage between the cathode and the anode, wherein the determination comprises utilization of the measured backscatter electron signal and a correlation between anode surface roughness and backscatter electron emission. The cathode current correction and/or the correction to the voltage between the cathode and the anode is provided (270) to the at least one power supply.
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公开(公告)号：US10651000B2
公开(公告)日：2020-05-12
申请号：US15409888
申请日：2017-01-19
Applicant: Beijing University of Technology
Inventor： Wei Liu , Mingchaung Tian , Jinshu Wang , Fan Zhou , Yiman Wang , Liran Dong , Yunfei Yang , Quan Zhang
IPC: B22F3/105 , H01J9/04 , B22F9/02 , B22F9/22 , C22B34/36 , B22F9/30 , H01J1/28 , H01J19/22 , H01J35/06
Abstract: The present disclosure discloses a preparation method of pressed Scandia-doped dispenser cathode using microwave sintering. Embodiments of the present disclosure include dissolving some nitrates and ammonium metatungstate with deionized water to prepare a homogeneous solution. Precursor powder with uniform size is obtained by spray drying, the precursor powder is decomposed, and two-step reduction may be proceeded to form doped tungsten powder with uniform element distribution. The cathode is prepared by one-time microwave sintering. One-time forming of cathode sintering is realized, and sintering shrinkage and sintering time are reduced significantly. The method has excellent repeatability, and the cathode has a homogeneous structure and excellent emission performance at 950° C.
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公开(公告)号：US10573484B2
公开(公告)日：2020-02-25
申请号：US15689326
申请日：2017-08-29
Applicant: General Electric Company
Inventor： Edward Emaci , Ian Strider Hunt , Alexander Ryan , Michael Gorrilla
Abstract: A structure and method of operation of a journal bearing is disclosed that minimizes contact of the shaft with the sleeve during start up and slow down of rotation of the shaft relative to the sleeve, or vice versa. The bearing assembly includes a gravitational load reduction mechanism with magnets disposed on the sleeve and on the shaft in alignment with one another. The magnet(s) on the shaft interacts with the magnet(s) disposed on the sleeve to provide a force against the pressure of the shaft towards the sleeve generated by gravity on the rotating component. The magnets enable centering of the rotating component within the stationary component during low rotation and non-rotation. This prevents rubbing of the rotating journal bearing component surfaces, e.g., sleeve, against the stationary journal bearing component, e.g., shaft, during assembly, ramp-up, and coast-down when the journal bearing fluid provides minimal or no bearing centering capability.
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公开(公告)号：US10546713B2
公开(公告)日：2020-01-28
申请号：US15679330
申请日：2017-08-17
Applicant: SIEMENS HEALTHCARE GMBH
Inventor： Anja Fritzler
Abstract: A thermionic emission device includes an indirectly heatable main emitter with a main emission surface and a connectible heat emitter with a heat emission surface. The heat emission surface is disposed at a predefinable distance from the main emission surface. In the operating state, the main emitter is at a constant main potential and the heat emitter can be switched between at least two heating potentials which differ from one another and which differ from the main potential. Through the use of the thermionic emission device, the radiation load for a patient is reduced in the case of dose-modulated x-ray recordings.
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Patent Agency Ranking
公开(公告)号：US20200029412A9
公开(公告)日：2020-01-23
申请号：US16153464
申请日：2018-10-05
Inventor： Reiko Kawachi , Hidehito Izawa , Kunio Honsawa , Hiroyuki Nomoto
Abstract: According to one embodiment, a device includes an instruction unit which records in a recording medium, event-related data of when an event is detected and monitoring data of when the event occurs, and a display data output unit which outputs from the recording medium and plays as display data, the event-related data and a part of the monitoring data corresponding to the event-related data. If there is a specification input to the displayed event-related data, the monitoring data corresponding to the event-related data is played.
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公开(公告)号：US10529526B2
公开(公告)日：2020-01-07
申请号：US16193336
申请日：2018-11-16
Applicant: General Electric Company
Inventor： Andrew Marconnet , Gregory A. Steinlage
Abstract: In the present invention, a flat emitter is formed from emitter material preforms shaped as thin sheets of the emitter material. These sheets are subjected to various levels and/or amounts of mechanical working during their initial formation and are bonded to one another to create a preform having the desired thickness. The preform including the bonded sheets is subsequently worked to shape the preform into the desired configuration for the emitter. The working of the sheets of emitter material utilized to create the preform and the working of the preform to form the emitter provide a highly creep-resistant emitter that significantly improves the operation and useful life of the resulting emitter.
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公开(公告)号：US10527562B2
公开(公告)日：2020-01-07
申请号：US15517122
申请日：2015-10-29
Inventor： Achuta Kadambi , Ramesh Raskar , Rajiv Gupta , Adam Pan
IPC: A61B6/10 , G01N23/083 , G01N23/046 , G01T1/24 , G21K1/04 , H01J35/06 , H01J35/14
Abstract: For each X-ray path through a tissue, numerous trials are conducted. In each trial, X-ray photons are emitted along the path until a Geiger-mode avalanche photodiode “clicks”. A temporal average—i.e., the average amount of time elapsed before a “click” occurs—is calculated. This temporal average is, in turn, used to estimate a causal intensity of X-ray light that passes through the tissue along the path and reaches the diode. Based on the causal intensities for multiple paths, a computer generates computed tomography (CT) images or 2D digital radiographic images. The causal intensities used to create the images are estimated from temporal statistics, and not from conventional measurements of intensity at a pixel. X-ray dosage needed for imaging is dramatically reduced as follows: a “click” of the photodiode triggers negative feedback that causes the system to halt irradiation of the tissue along a path, until the next trial begins.
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公开(公告)号：US10468222B2
公开(公告)日：2019-11-05
申请号：US15086257
申请日：2016-03-31
Applicant: General Electric Company
Inventor： Sergio Lemaitre
Abstract: In the present invention, a computed tomography system, an X-ray tube used therein and a cathode assembly disposed in the X-ray tube, as well as an associated method of use, is provided that includes a gantry and the X-ray tube coupled to the gantry. The X-ray tube includes the cathode assembly having a pair of emitters for generating an electron beam, where the pair of emitters are disposed in the casing at angles with respect to one another. The X-ray tube further includes a focusing electrode for focusing the electron beam, an extraction electrode which electrostatically controls the intensity of the electron beam, a target for generating X-rays when impinged upon by the electron beam and a magnetic focusing assembly located between the cathode assembly and the target for focusing the electron beam towards the target.
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公开(公告)号：US20190333730A1
公开(公告)日：2019-10-31
申请号：US16312565
申请日：2017-03-16
Applicant: MEIDENSHA CORPORATION
Inventor： Daizo TAKAHASHI , Michihiro HATANAKA
Abstract: An emitter (3) and a target (7) are arranged so as to face each other in a vacuum chamber (1), and a guard electrode (5) is provided at an outer circumferential side of an electron generating portion (31) of the emitter (3). The emitter (3) is supported movably in both end directions of the vacuum chamber (1) by the emitter supporting unit (4) having a movable body (40). The emitter supporting unit (4) is operated by an operating unit (6) connected to the emitter supporting unit (4). By operating the emitter supporting unit (4) by the operating unit (6), a distance between the electron generating portion (31) of the emitter (3) and the target (7) is changed, and a position of the emitter (3) is fixed at an arbitrary distance, then field emission is performed with the position of the emitter (3) fixed.
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