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公开(公告)号：US11589448B2
公开(公告)日：2023-02-21
申请号：US17395571
申请日：2021-08-06
摘要： An X-ray source for emitting an X-ray beam is proposed. The X-ray source comprises an anode and an emitter arrangement comprising a cathode for emitting an electron beam towards the anode and an electron optics for focusing the electron beam at a focal spot on the anode. The X-ray source further comprises a controller configured to determine a switching action of the emitter arrangement and to actuate the emitter arrangement to perform the switching action, the switching action being associated with a change of at least one of a position of the focal spot on the anode, a size of the focal spot, and a shape of the focal spot. The controller is further configured to predict before the switching action is performed, based on the determined switching action, the size and the shape of the focal spot expected after the switching action. Further, the controller is configured to actuate the electron optics to compensate for a change of the size and the shape of the focal spot induced by the switching action.
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公开(公告)号：US11534118B2
公开(公告)日：2022-12-27
申请号：US17338299
申请日：2021-06-03
发明人： Paul R. Schwoebel , John M. Boone
IPC分类号： A61B6/00 , H01J35/14 , A61B6/06 , G01N23/046 , G01N23/083 , G01N23/10 , H01J35/04 , H01J35/10 , A61B6/02
摘要： Embodiments provide a stationary X-ray source for a multisource X-ray imaging system for tomographic imaging. The stationary X-ray source includes an array of thermionic cathodes and, in most embodiments a rotating anode. The anode rotates about a rotation axis, however the anode is stationary in the horizontal or vertical dimensions (e.g. about axes perpendicular to the rotation axis). The elimination of mechanical motion improves the image quality by elimination of mechanical vibration and source motion; simplifies system design that reduces system size and cost; increases angular coverage with no increase in scan time; and results in short scan times to, in medical some medical imaging applications, reduce patient-motion-induced blurring.
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公开(公告)号：US20220338821A1
公开(公告)日：2022-10-27
申请号：US17761574
申请日：2020-09-19
申请人： ESSPEN GMBH
发明人： Zahra MOHAMMADI
摘要： A computer tomograph operates by rigidly arranged x-ray tubes, which are components of emitter-detector elements, which form an emitter-detector ring opened by relocating one emitter-detector element. Each x-ray tube includes a cathode emitting electrons, and an anode arrangement having an anode. Each cathode has an orientation angle relative to the geometrical center axis of the computer tomograph. A tangential plane on the focal spot of the anode has a surface normal, which includes an anode angle with the center axis. X-ray radiation emitted from the focal spot is directed in a center radiation angle to an x-ray detector axially offset relative to the x-ray tubes. The quotient from the sum of the orientation angle, radiation angle and anode angle is between two ninths and two. Each cathode, interacting with an electrode arrangement of the x-ray tubes, produces a focal spot on one of selectable positions on the anode arrangement.
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公开(公告)号：US20220277920A1
公开(公告)日：2022-09-01
申请号：US17699749
申请日：2022-03-21
发明人： Stefan Bartzsch , Uwe Oelfke
摘要： An x-ray micro-beam radiation production system is provided having: a source of accelerated electrons, an electron focusing component configured to focus the electrons provided by the source, and a target which produces x-rays when electrons impinge thereon from the source. The electron focusing component is configured to focus the electrons provided by the source such that they impinge at a focal spot having a width δ formed on a surface of the target. The focusing component is configured to move the electron beam relative to the target such that the focal spot moves across the target surface in the width direction, and/or the target is movable relative to the focusing component such that the focal spot moves across the target surface in the width direction, the surface velocity of the focal spot across the target surface in the width direction being greater than vt where:formula (I), k, ρ and c denoting respectively the heat conductivity, the density and the heat capacity of the target material, and d denoting the electron penetration depth in the target material. v t = π k 4 ρ c · δ d 2 ,
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公开(公告)号：US20220277919A1
公开(公告)日：2022-09-01
申请号：US17628615
申请日：2020-07-21
摘要： An X-ray source (100) for generating X-ray radiation of first and second energy spectra is proposed, wherein the X-ray intensity imbalance between the first and second energy spectra is reduced as compared to conventional X-ray sources. The reduction of the X-ray intensity imbalance is achieved by configuring a smaller electron impact angle (141) onto the anode (102) when the higher tube voltage is applied as compared to when the lower tube voltage is applied.
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公开(公告)号：US11342154B2
公开(公告)日：2022-05-24
申请号：US16766935
申请日：2018-11-30
申请人： Excillum AB
发明人： Björn Hansson , Per Takman , Yuli Wang , Shiho Tanaka
摘要： The present inventive concept relates to an X-ray source comprising: a liquid target source configured to provide a liquid target moving along a flow axis; an electron source configured to provide an electron beam; and a liquid target shaper configured to shape the liquid target to comprise a non-circular cross section with respect to the flow axis, wherein the non-circular cross section has a first width along a first axis and a second width along a second axis, wherein the first width is shorter than the second width, and wherein the liquid target comprises an impact portion being intersected by the first axis; wherein the x-ray source is configured to direct the electron beam towards the impact portion such that the electron beam interacts with the liquid target within the impact portion to generate X-ray radiation.
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公开(公告)号：US11324973B2
公开(公告)日：2022-05-10
申请号：US17016372
申请日：2020-09-10
申请人： Maureen Petterson , W. Davis Lee
发明人： Maureen Petterson , W. Davis Lee
摘要： The invention comprises a method and apparatus for using a multi-layer multi-color scintillation based detector element to image a tumor of a patient using a process of determining residual energies of positively charged particles after passing through the patient, the process comprising the steps of: (1) transmitting the positively charged particles at known energies through the patient and into a multi-layer detector element; (2) detecting first and second secondary photons, resultant from passage of the positively charged particles, respectively from a first layer of a first scintillation material and a second layer of a second scintillation material at two respective layer depths, where the first wavelength range differs from the second wavelength range; (4) determining residual energies of the positively charged particles, using output from the step of detecting; and (5) relating the residual energies to body densities to generate an image.
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公开(公告)号：US11310898B2
公开(公告)日：2022-04-19
申请号：US16722769
申请日：2019-12-20
发明人： Jani Reijonen
摘要： A apparatus may include a power supply to receive a first voltage potential and output a second voltage potential that is greater than the first voltage potential and a cathode emitter to emit ions in response to application of the second voltage potential. The apparatus may also include a step down transformer to receive the second voltage potential and output a third voltage potential that is less than the second voltage potential. The apparatus may also include a heating element to, in response to application of the third voltage potential, heat the cathode emitter and lower a work function of the cathode emitter.
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公开(公告)号：US20220013321A1
公开(公告)日：2022-01-13
申请号：US17477022
申请日：2021-09-16
申请人： Moxtek, Inc.
发明人： Todd S. Parker , Eric Miller
摘要： X-ray transparent insulation can be sandwiched between an x-ray window and a ground plate. The x-ray transparent insulation can include aluminum nitride, boron nitride, or polyetherimide. The x-ray transparent insulation can include a curved side. The x-ray transparent insulation can be transparent to x-rays and resistant to x-ray damage, and can have high thermal conductivity. An x-ray window can have high thermal conductivity, high electrical conductivity, high melting point, low cost, and matched coefficient of thermal conductivity with the anode. The x-ray window can be made of tungsten. For consistent x-ray spot size and location, a focusing plate and a filament can be attached to a cathode with an open channel of the focusing plate aligned with a longitudinal dimension of the filament. Tabs of the focusing plate bordering the open channel can be bent to align with a location of the filament.
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公开(公告)号：US11217420B2
公开(公告)日：2022-01-04
申请号：US16775361
申请日：2020-01-29
发明人： Takayuki Ito
摘要： According to one embodiment, an X-ray tube includes an anode including a target surface, and a cathode including a first filament and a focusing electrode. The focusing electrode includes a valley bottom portion, a first inclined plane sloping up from the valley bottom portion in a direction of the anode, a first focusing groove, and a first storage groove. θ1 is greater than 0°. The first focusing groove has a longitudinal axis. One end portion on the first extension line side of the first focusing groove is closer to a first reference surface than the other end portion of the first focusing groove.
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