Patents by Inventor Roger Steadman

Roger Steadman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11002865
    Abstract: The invention relates to a detection values determination system, especially for photon-counting CT scanners, comprising a detection pulse providing unit for providing detection pulses for an array of detection pixels 17, which is provided with an anti-charge-sharing grid 15 for suppressing charge sharing between different clusters 14 of the detection pixels, wherein the detection pulses are indicative of the energy of photons incident on the detection pixels. Charge-sharing-corrected detection values are determined based on the provided detection pulses, wherein for determining a charge-sharing-corrected detection value for a detection pixel of a cluster only detection pixels of the same cluster are considered. This allows for a relatively high detective quantum efficiency, wherein the technical efforts for providing the charge sharing correction can be relatively low.
    Type: Grant
    Filed: November 20, 2016
    Date of Patent: May 11, 2021
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ewald Roessl, Roger Steadman Booker
  • Patent number: 10996351
    Abstract: The invention relates to a pulse shaper (18). The pulse shaper (18) comprises an integrator (19) for generating a pulse having a peak amplitude indicative of the energy of a detected photon, a feedback resistor (22), switchable discharge circuitry (23) for discharging the integrator (19), and a peak detector (24) for detecting the peak of the pulse. The pulse shaper is adapted to start the discharge of the integrator by the switchable discharge circuitry based on the detection of the peak and to connect the feedback resistor in parallel to the integrator during a period of the pulse generation and to disconnect the feedback resistor during another period of the pulse generation. The pulse shaper can be such that the generation of the pulse is substantially unhindered by any noticeable concurrent discharging mechanism while, at the same time, the occurrence of energy pedestals can be efficiently avoided.
    Type: Grant
    Filed: April 4, 2018
    Date of Patent: May 4, 2021
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Christoph Herrmann
  • Patent number: 10980506
    Abstract: An image signal processing system (ISP) comprising an input interface (IN) for receiving photon counting projection data acquired by an X-ray imaging apparatus (IA) having a photon counting detector (D). A calibration data memory (CMEM) of the system holds calibration data. The calibration data encodes photon counting data versus path lengths curves for different energy thresholds of i) said detector (D) or ii) of a different detector. At least one of said curves is not one-to-one. A path length convertor (PLC) of the system converts an entry in said photon counting projection data into an associated path length based on said calibration data.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: April 20, 2021
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ewald Roessl, Roger Steadman, Christoph Herrmann, Roland Proksa
  • Publication number: 20210072167
    Abstract: A computed tomography (CT) detector array (120) includes a monolithic scintillator (124). The monolithic scintillator includes at least a first scintillator region (202), a second scintillator region (206), and an optically reflective barrier (210) therebetween. The detector array is configured to detect X-ray radiation traversing an examination region and impinging the monolithic scintillator and generate first projection data indicative of an energy of x-ray radiation absorbed by the first scintillator region and second projection data indicative of an energy of x-ray radiation traversing the first scintillator and absorbed by the second scintillator region.
    Type: Application
    Filed: August 20, 2018
    Publication date: March 11, 2021
    Inventors: ROGER STEADMAN BOOKER, WALTER RUETTEN
  • Publication number: 20210067710
    Abstract: A signal processing system (SPS) and related method. The system comprises an input interface (IN) for receiving at least two data sets, comprising a first data set and second data set. The first data set is generated by an X-ray detector sub-system (XDS) at a first pixel size and the second data set generated at a second pixel size different from the first pixel size. An estimator (EST) is configured to compute, based on the two data sets, an estimate of a charge sharing impact.
    Type: Application
    Filed: January 8, 2019
    Publication date: March 4, 2021
    Inventors: ROGER STEADMAN BOOKER, EWALD ROESSL
  • Publication number: 20210041580
    Abstract: The present invention relates to a detection device for X-rays, an imaging system and a method for detecting electro-magnetic radiation using a detection device for X-rays, wherein an estimate of an incomplete measurement is acquired prior to a discontinuity of the electromagnetic radiation, wherein the discontinuity is a change or interruption in a beam or in an intensity of the electromagnetic radiation.
    Type: Application
    Filed: February 25, 2019
    Publication date: February 11, 2021
    Inventors: Roger STEADMAN BOOKER, Roland PROKSA
  • Patent number: 10912527
    Abstract: The present invention relates to an apparatus for generating dual energy X-ray imaging data. It is described to position (210) an X-ray detector relative to an X-ray source such that at least a part of a region between the X-ray source and the X-ray detector is an examination region for accommodating an object. A grid filter is positioned (220) between the examination region and the X-ray source. The X-ray source produces (230) a focal spot on a target to produce X-rays. The X-ray source moves (240) the focal spot in a first direction across a surface of the target. The grid filter has a structure in a first orientation such that the movement of the focal spot in the first direction results in an associated change in an intensity of X-rays transmitted by the grid filter. The X-ray source moves (250) the focal spot in a second direction across the surface of the target that is orthogonal to the first direction.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: February 9, 2021
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Gereon Vogtmeier, Roger Steadman Booker
  • Publication number: 20210007210
    Abstract: An X-ray source (10) for emitting an X-ray beam (101) is proposed. The X- ray source (10) comprises an anode (12) and an emitter arrangement (14) comprising a cathode (16) for emitting an electron beam (15) towards the anode (12) and an electron optics (18) for focusing the electron beam (15) at a focal spot (20) on the anode (12). The X-ray source (10) further comprises a controller (22) configured to determine a switching action of the emitter arrangement (14) and to actuate the emitter arrangement (14) to perform the switching action, the switching action being associated with a change of at least one of a position of the focal spot (20) on the anode (12), a size of the focal spot (20), and a shape of the focal spot (20). The controller (22) 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 (20) expected after the switching action.
    Type: Application
    Filed: February 19, 2019
    Publication date: January 7, 2021
    Inventors: ROGER STEADMAN BOOKER, GEREON VOGTMEIER
  • Publication number: 20200390413
    Abstract: An image signal processing system (ISP) comprising an input interface (IN) for receiving photon counting projection data acquired by an X-ray imaging apparatus (IA) having a photon counting detector (D). A calibration data memory (CMEM) of the system holds calibration data. The calibration data encodes photon counting data versus path lengths curves for different energy thresholds of i) said detector (D) or ii) of a different detector. At least one of said curves is not one-to-one. A path length convertor (PLC) of the system converts an entry in said photon counting projection data into an associated path length based on said calibration data.
    Type: Application
    Filed: June 29, 2017
    Publication date: December 17, 2020
    Inventors: Ewald ROESSL, Roger STEADMAN, Christoph HERRMANN, Roland PROKSA
  • Patent number: 10868074
    Abstract: The present invention relates to a detector module comprising a direct conversion crystal (10) for converting incident photons into electrical signals, said direct conversion crystal having a cathode metallization (100) deposited on a first surface and an anode metallization (101) deposited on a second surface, an integrated circuit (12) in electrical communication with said direct conversion crystal, said integrated circuit having a smaller width than said direct conversion crystal thus forming a recess (120) in width direction at a side surface of the integrated circuit, an interposer (11, 11a) arranged between said direct conversion crystal and said integrated circuit for providing electrical communication there between, wherein said interposer is made as separate element that is glued, soldered or bonded with the anode metallization (101) of said direct conversion crystal facing said integrated circuit, and a multi-lead flex cable (13, 13a, 13b, 13c, 13d) providing a plurality of output paths, said multi-
    Type: Grant
    Filed: July 14, 2017
    Date of Patent: December 15, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Christoph Herrmann, Roger Steadman Booker, Amir Livne
  • Publication number: 20200375556
    Abstract: The present invention relates to an apparatus for generating dual energy X-ray imaging data. It is described to position an X-ray detector relative to an X-ray source such that at least a part of a region between the X-ray source and the X-ray detector is an examination region for accommodating an object. A grid filter is positioned (220) between the examination region and the X-ray source. The X-ray source produces (230) a focal spot on a target to produce X-rays. The X-ray source moves (240) the focal spot in a first direction across a surface of the target. The grid filter has a structure in a first orientation such that the movement of the focal spot in the first direction results in an associated change in an intensity of X-rays transmitted by the grid filter. The X-ray source moves (250) the focal spot in a second direction across the surface of the target that is orthogonal to the first direction.
    Type: Application
    Filed: December 27, 2018
    Publication date: December 3, 2020
    Inventors: GEREON VOGTMEIER, ROGER STEADMAN BOOKER
  • Patent number: 10809396
    Abstract: An imaging system (100) includes a detector module (114). The detector module includes a block (300) of a plurality of direct conversion photon counting detector pixels (122) and corresponding electronics (124, 604, 606, 132, 134 or 124, 128, 130, 134, 802) with hardware for both high energy resolution imaging mode and high X-ray flux imaging mode connected with the block of the plurality of direct conversion photon counting detector pixels. A method includes identifying a scanning mode for a selected imaging protocol, wherein the scanning modes includes one of a higher energy resolution mode and a higher X-ray flux mode, configuring a detector module, which is configurable for both the higher energy resolution mode and the higher X-ray flux mode, based on the identified scanning mode, performing the scan with the detector module configured for the mode of the selected imaging protocol, and processing scan data from the scan, generating volumetric image data.
    Type: Grant
    Filed: July 4, 2016
    Date of Patent: October 20, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ira Micah Blevis, Roger Steadman Booker, Christoph Herrmann
  • Publication number: 20200326437
    Abstract: The invention relates to radiation detector for registering incident photons, comprising (i) detection circuitry (202, 206, 207) configured to provide an electric output signal in response to incident photons, the output signal comprising pulses having an amplitude indicative of energies deposited in the radiation detector by the incident photons, and (ii) an energy estimating circuit (2081, . . . , 208N; 2091, . . . , 209N) configured to detect that the output signal is larger than at least one threshold corresponding to an energy value in order to determine energies of incident photons. The radiation detector further comprises a registration circuit (211) configured to detect incident photons independent of a comparison of the output signal with the at least one threshold. Moreover, the invention relates to a method for detecting photons using the radiation detector.
    Type: Application
    Filed: June 16, 2017
    Publication date: October 15, 2020
    Inventors: Roger STEADMAN BOOKER, Ewald ROESSL
  • Publication number: 20200281549
    Abstract: An X-ray imaging system (10) for medical imaging is provided. The imaging system (10) comprises an X-ray source (12) for emitting X-rays, an X-ray detector (14) for detecting X-rays, at least one unmanned aircraft (16), and at least one controller (18) for controlling at least one of the X-ray source (12), the X-ray detector (14), and the at least one unmanned aircraft (16). The X-ray source (12) or the X-ray detector (14) is arranged on the at least one unmanned aircraft (16), wherein the X-ray imaging system (10) is configured to capture an X-ray image of an object (15) arranged between the X-ray source (12) and the X-ray detector (14).
    Type: Application
    Filed: September 21, 2018
    Publication date: September 10, 2020
    Inventors: ROGER STEADMAN BOOKER, ANAND KUMAR DOKANIA, JENS VON BERG
  • Patent number: 10725188
    Abstract: Photon-counting x-ray detectors (3) suffer from a degradation of their performance due to polarization. In order to correct the effects of polarization to the generated x-ray images, the invention suggests (i) exposing the radiation detector (3) to a first radiation pulse emitted by a further radiation source (11) and obtaining a first electric pulse signal generated by the radiation detector (3) in response thereto, (ii) later exposing the 5 radiation detector (3) to a second radiation pulse emitted by the further radiation source (11) during the acquisition of the image and obtaining a second electric pulse signal generated by the radiation detector (3) in response thereto, and (iii) comparing amplitudes of the first and second electric pulse signals and generating the x-ray image based on a result of the comparison. The invention provides a corresponding x-ray device and a corresponding method.
    Type: Grant
    Filed: October 11, 2016
    Date of Patent: July 28, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Ewald Roessl, Heiner Daerr
  • Publication number: 20200183023
    Abstract: The invention relates to a radiation detector (1), an imaging system and a related method for radiation detection. The detector comprises a direct conversion material (2) for converting x-ray and/or gamma radiation into electron-hole pairs by direct photon-matter interaction. The detector comprises an anode (3) and a cathode (4) arranged on opposite sides of the direct conversion material (2) such that the electrons and holes can respectively be collected by the anode and cathode. The cathode is substantially transparent to infrared radiation. The detector comprises a light guide layer (5) on the cathode at a side of the cathode that is opposite of the direct conversion material, in which the light guide layer is adapted for distributing infrared radiation over the direct conversion material. The detector comprises a reflector layer (6) arranged on the light guide layer (5) at a side opposite of the cathode, in which the reflector layer is adapted for substantially reflecting infrared radiation.
    Type: Application
    Filed: June 21, 2018
    Publication date: June 11, 2020
    Inventors: ROGER STEADMAN BOOKER, CHRISTOPH HERRMANN
  • Patent number: 10679762
    Abstract: The invention relates to an analyzing grid for phase contrast imaging and/or dark-field imaging, a detector arrangement for phase contrast imaging and/or dark-field imaging comprising such analyzing grid, an X-ray imaging system comprising such detector arrangement, a method for manufacturing such analyzing grid, a computer program element for controlling such analyzing grid or detector arrangement for performing such method and a computer readable medium having stored such computer program element. The analyzing grid comprises a number of X-ray converting gratings. The X-ray converting gratings are configured to convert incident X-ray radiation into light or charge. The number of X-ray converting gratings comprises at least a first X-ray converting grating and a second X-ray converting grating.
    Type: Grant
    Filed: June 8, 2017
    Date of Patent: June 9, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Thomas Koehler, Roger Steadman Booker, Matthias Simon, Walter Ruetten, Herfried Karl Wieczorek
  • Patent number: 10656290
    Abstract: In the present invention a direct X-ray conversion layer comprises a material having a perovskite crystal structure. This is preferable since this enables constructing an X-ray detector with edge-on illuminated detector elements.
    Type: Grant
    Filed: May 27, 2017
    Date of Patent: May 19, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Herfried Karl Wieczorek, Cornelis Reinder Ronda, Roger Steadman, Matthias Simon
  • Patent number: 10627532
    Abstract: The invention relates to a correction device (8) for a radiation detector (2) including detector elements each for detecting incident photons. The correction device (8) is configured to read detection signals representative of an incident photon flux detected by the detector elements for different incident photon fluxes, and an evaluation unit (11) configured to determine for each detector element a dead time of the detector element and a parameter representative of an effective area of the detector element on the basis of a collective evaluation of the detection signals of the respective detector element. Further, the correction device (8) is configured to determine for each detector element correction parameters to compensate for differences in the effective areas and in the dead times of the detector elements on the basis of the determined parameters representative of the effective area and the determined dead times of the detector elements.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: April 21, 2020
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ewald Roessl, Roger Steadman Booker
  • Publication number: 20200113532
    Abstract: The present invention relates to a device (1) for determining positioning data for an X-ray image acquisition device (2) on a mobile patient support unit (3), the device comprising: a processing unit (10); and a status detector (11); wherein the status detector (11) is configured to acquire geometry data and type data of a mobile patient support unit (3) and of an X-ray image acquisition device (2) on the mobile patient support unit (3), and to transmit a status signal comprising the geometry data and the type data; wherein the processing unit (10) is configured to receive the status signal and data about region of interest position on the patient; and wherein, based on the status signal and the region of interest position, the processing unit (10) is configured to determine positioning and alignment data for an X-ray image acquisition device (2) on the mobile patient support unit (3), and to provide an image acquisition protocol for the X-ray image acquisition device (2).
    Type: Application
    Filed: May 18, 2018
    Publication date: April 16, 2020
    Inventors: GEREON VOGTMEIER, JENS VON BERG, RAVINDRA BHAT, ROGER STEADMAN BOOKER