公开(公告)号：US11241206B2

公开(公告)日：2022-02-08

申请号：US15924495

申请日：2018-03-19

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Shingo Abe ,  Akihito Takahashi ,  Takayuki Ishikawa ,  Mitsuru Sakata

IPC: A61B6/00 ,  A61B6/03 ,  A61B6/04 ,  A61B6/06

Abstract: An X-ray imaging apparatus according to an embodiment includes an X-ray generator, an X-ray detector, an input interface, and processing circuitry. The processing circuitry is configured to: display, on a display, an image based on X-rays detected by the X-ray detector; control, based on a first control signal according to the direction signal, a rotating mechanism of the arm so that the arm performs a first rotation; and control, in response to an end of the first rotation, based on a second control signal, the rotating mechanism so that the arm performs a second rotation which returns the arm toward a position before the first rotation, the position being stored in a memory circuit.

公开(公告)号：US20220031264A1

公开(公告)日：2022-02-03

申请号：US17203222

申请日：2021-03-16

Applicant: TROPHY

Inventor： Anna-Sesilia Vlachomitrou ,  Vincent Loustauneau

IPC: A61B6/14 ,  A61B6/02 ,  A61B6/03 ,  A61B6/06 ,  A61B6/00 ,  G06T11/00

Abstract: An extra-oral dental imaging system comprises an X-ray source (102) and an imaging device (101) suitable for producing multiple frames during at least part of an exposure of an object (200), the imaging device (101) being displaced along a scanning direction (X). A method for creating a cephalometric image of a human skull comprises a step of setting said imaging device (101) with an active area having in an imaging plane a width extending along said scanning direction (X), said width varying along a height direction perpendicular to said scanning direction (X); a step of synchronously displacing the X-ray source (102) and the imaging device (101) along said exposure profile; and a step of registering multiple frames produced by the imaging device (101) during the exposure of said object (200) to be imaged. Using for creating a cephalometric image by digital tomosynthesis.

公开(公告)号：US11229411B2

公开(公告)日：2022-01-25

申请号：US16526186

申请日：2019-07-30

Applicant: Siemens Healthcare GmbH

Inventor： Michael Wiets ,  Philipp Wiets

IPC: A61B6/00 ,  A61B6/03 ,  G21K1/06 ,  A61B6/04 ,  A61B6/06

Abstract: An X-ray apparatus includes an X-ray source embodied to generate X-rays; an X-ray detector; and an X-ray reflector. The X-ray reflector is embodied to reflect X-rays generated by the X-ray source such that the reflected X-rays hit the X-ray detector. The X-ray detector is in particular embodied to detect the X-rays. The X-ray apparatus can, on the one hand, enlarge the available space above a patient. Furthermore, focusing via the X-ray reflector enables the power of the X-ray source to be increased while retaining a constant spatial resolution or the spatial resolution to be improved while retaining a constant power of the X-ray source.

公开(公告)号：US11224396B2

公开(公告)日：2022-01-18

申请号：US16694218

申请日：2019-11-25

Applicant: Accuray, Inc.

Inventor： Daniel Gagnon ,  Chuanyong Bai ,  Zhicong Yu ,  Amit Jain ,  Calvin R. Maurer, Jr.

IPC: A61B6/00 ,  G06T11/00 ,  A61B6/03 ,  A61B6/06 ,  A61B6/02 ,  A61N5/10 ,  A61B6/08 ,  G06T7/30 ,  A61B5/055 ,  A61B6/04

Abstract: An x-ray imaging apparatus and associated methods are provided to receive measured projection data from a wide aperture scan of a wide axial region and a narrow aperture scan of a narrow axial region within the wide axial region and determine an estimated scatter in the wide axial region using an optimized scatter estimation technique. The optimized scatter estimation technique is based on the difference between the measured scatter in the narrow axial region and the estimated scatter in the narrow axial region. Kernel-based scatter estimation/correction techniques can be fitted to minimize the scatter difference in the narrow axial region and thereafter applying the fitted (optimized) kernel-based scatter estimation/correction to the wide axial region. Optimizations can occur in the projection data domain or the reconstruction domain. Iterative processes are also utilized.

公开(公告)号：US11219425B2

公开(公告)日：2022-01-11

申请号：US16470587

申请日：2017-12-19

Applicant: KONINKLIJKE PHILIPS N.V. ,  ION BEAM APPLICATIONS S.A.

Inventor： Dirk Schäfer

IPC: A61B6/03 ,  A61B6/00 ,  A61B6/02 ,  G06T11/00 ,  A61B6/06 ,  G01N23/046

Abstract: The invention relates to off-center detector X-ray tomography reconstruction of an image of an object on the basis of projection data acquired during a rotation of an X-ray source and the off-center detector around the object in two rotational passes of less than 360°, wherein a focus point of the X-ray beam travels along largely overlapping arcs (401, 402) in the two rotational passes, the off-center detector being positioned asymmetrically with respect to a central of the X-ray beam and a direction of a detector offset being reversed between the passes. According to the invention, redundancy weighting of the projection data with respect to a redundant acquisition of projection values during each of the rotational passes is made using a redundancy weighting function determined on the basis of a union of the arcs (401, 402).

公开(公告)号：US11193062B2

公开(公告)日：2021-12-07

申请号：US16825293

申请日：2020-03-20

Applicant: SAMSUNG ELECTRONICS CO., LTD.

Inventor： Garam Park ,  Tae Gon Kim ,  Nayoun Won ,  Shin Ae Jun ,  Soo Kyung Kwon ,  Seon-Yeong Kim ,  Shang Hyeun Park ,  Jooyeon Ahn ,  Yuho Won ,  Eun Joo Jang ,  Hyo Sook Jang

IPC: C09K11/88 ,  C09K11/62 ,  C09K11/70 ,  C09K11/56 ,  C09K11/02 ,  H01L27/32 ,  F21V8/00 ,  G02F1/1335 ,  G02F1/13357 ,  H05B33/14 ,  A61B6/06 ,  A61B6/00 ,  G01T7/00 ,  G21K1/02 ,  B82Y20/00 ,  B82Y40/00 ,  A61B6/02

Abstract: Disclosed are a quantum dot population including a plurality of cadmium free quantum dots, a quantum dot polymer composite including the same, and a display device including the same. The plurality of cadmium free quantum dots includes: a semiconductor nanocrystal core comprising indium and phosphorous, a first semiconductor nanocrystal shell disposed on the semiconductor nanocrystal core and comprising zinc and selenium, and a second semiconductor nanocrystal shell disposed on the first semiconductor nanocrystal shell and comprising zinc and sulfur, wherein an average particle size of the plurality of cadmium free quantum dots is greater than or equal to about 5.5 nm, a standard deviation of particle sizes of the plurality of cadmium free quantum dots is less than or equal to about 20% of the average particle size, and an average solidity of the plurality of cadmium free quantum dots is greater than or equal to about 0.85.

公开(公告)号：US11185296B2

公开(公告)日：2021-11-30

申请号：US16345629

申请日：2017-10-09

Applicant: Siemens Healthcare GmbH

Inventor： Philipp Bernhardt ,  Michael Stark

IPC: A61B6/06 ,  A61B6/02 ,  G01T1/20 ,  A61B6/00 ,  G01N23/04 ,  G01N23/20

Abstract: The invention relates to a method (62, 64) for creating x-ray images as well as to an x-ray system. During the creation of an x-ray image, a slit diaphragm (16) is moved in front of an object (24) to be x-rayed, along a path extending between a radiation source (10) and said object (24), in order for the object (24) to be scanned. X-rays emitted by the radiation source (10) are detected by a detector (20) upon penetration of the slit diaphragm (16) and the object (24) to be x-rayed. In order to create an x-ray image using a simplified slot scanning technique, the x-ray image is created without the need for a second slit diaphragm (16) between the object (24) to be x-rayed and the detector (20), and only the radiation of which the intensity (60), detected by the detector (20) during the scan, exceeds a predefined threshold value is processed.

公开(公告)号：US11175247B2

公开(公告)日：2021-11-16

申请号：US16668630

申请日：2019-10-30

Applicant: Shimadzu Corporation

Inventor： Toshihide Toyoda

IPC: A61B6/00 ,  G01N23/223 ,  G01N23/04 ,  A61B6/04 ,  A61B6/06

Abstract: An X-ray imaging apparatus implements a fluoroscopy that irradiates a weaker dose of X-rays than a dose on the long-length imaging toward a subject M at each location in the long-length imaging range, while moving an X-ray tube in a body axis direction relative to the subject M prior to the long-length imaging, when the long-length imaging is implemented by moving the X-ray tube 2 in the body axis direction relative to the subject M. The dose D1 at the location having the thick body thickness is less, so that the tube voltage is set up to be high as the tube voltage V1 and vice versa, the dose D2 at the location having the thin body thickness is high, so that the tube voltage is set up to be low as the tube voltage V2.

公开(公告)号：US11172902B2

公开(公告)日：2021-11-16

申请号：US16784429

申请日：2020-02-07

Applicant: Siemens Healthcare GmbH

Inventor： Alexander Gemmel ,  Björn Kreher ,  Holger Kunze ,  Markus Weiten ,  Jessica Magaraggia ,  Gerhard Kleinszig ,  Tobias Lenich ,  Edgar Zaus

IPC: A61B6/00 ,  G06T7/30 ,  A61B6/06 ,  A61B6/03 ,  G06N20/00 ,  G06T7/00

Abstract: The disclosure relates to a method for recording a panorama dataset of an examination object by a movable medical x-ray device, to a medical x-ray device, and to a computer program product for carrying out the method. The medical x-ray device has an x-ray source, which emits a bundle of x-rays, wherein a first image segment, which maps at least one part of the examination object, is recorded at a first point in time. Position data is acquired, which maps the spatial position of the x-ray device at this first point in time. At least one further image segment along an imaging path is recorded after there has been a movement of the x-ray device, wherein the imaging path lies in one plane, wherein a central ray of the bundle of x-rays emitted by the x-ray source does not run in parallel to the plane in which the imaging path lies. Additionally, position data is acquired, which maps the spatial position of the x-ray device at the time of the recording of the at least one further image segment. The acquired position data is uniquely assigned to the recorded image segments. The panorama dataset is assembled from at least two image segments with the position data assigned thereto from a set of all recorded image segments with the position data assigned thereto.

公开(公告)号：US20210338181A1

公开(公告)日：2021-11-04

申请号：US17338299

申请日：2021-06-03

Applicant: The Regents of the University of California ,  SRI International

Inventor： Paul R. SCHWOEBEL ,  John M. BOONE

IPC: A61B6/00 ,  H01J35/14 ,  A61B6/06 ,  G01N23/046 ,  G01N23/083 ,  G01N23/10 ,  H01J35/04 ,  H01J35/10

Abstract: 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.