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).

  • Publication number: 20180313964
    Abstract: Method of pixel volume confinement in a crystal of an energy resolving radiation detector, preferably an X-ray detector, more preferably a Computed Tomography detector, the crystal having a cathode side and an anode side, comprising: a. Inducing a break line (501) in the crystal along a pixel virtual limits b. Passivating the break line.
    Type: Application
    Filed: November 16, 2016
    Publication date: November 1, 2018
    Inventors: Roger STEADMAN BOOKER, Frank VERBAKEL
  • Publication number: 20180284035
    Abstract: The present invention relates to a dual- or multi-source CT system and method. For suppressing or even completely eliminating the negative effects of cross-scatter, the proposed CT system comprises two x-ray sources (10, 11), two detectors (13, 14), two read-out units (15, 16), a control unit (17) and a reconstruction unit (19). Further, a scatter correction unit (18) is provided or the read-out units (15, 16) are configured to generate scatter-corrected read-out signals from the detected radiation, wherein a scatter-corrected read-out signal is generated from the radiation detected by a detector during a single projection interval (I) including multiple repetitions of three phases, in which the sources are alternately switched on and off and in which the read-out units alternately register primary radiation or cross-scatter radiation.
    Type: Application
    Filed: October 12, 2016
    Publication date: October 4, 2018
    Applicant: Koninklijke Philips N.V.
    Inventors: Roger STEADMAN BOOKER, Ewald ROESSL
  • Publication number: 20180284303
    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: Application
    Filed: October 11, 2016
    Publication date: October 4, 2018
    Inventors: Roger STEADMAN BOOKER, Ewald ROESSL, Heiner DAERR
  • Patent number: 10078009
    Abstract: The invention relates to a method and a pulse processing circuit (100) for the processing of current pulses (CP) generated by incident photons (X) in a piece of converter material, for instance in a pixel (11) of a radiation detector. Deviations of the pulse shape from a reference are detected and used to identify pulse corruption due to pile-up effects at high count rates and/or charge sharing between neighboring pixels. The deviation detection may for instance be achieved by generating, with a pulse shaper (110), bipolar shaped pulses from the current pulse (CP) and/or two shaped pulses of different shapes which can be compared to each other.
    Type: Grant
    Filed: April 17, 2014
    Date of Patent: September 18, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Heiner Daerr, Klaus Juergen Engel, Christoph Herrmann, Roger Steadman Booker, Ewald Roessl
  • Patent number: 10054692
    Abstract: The present invention relates to a detector (22?) for detecting ionizing radiation, comprising: a directly converting semi-conductor layer (36) for producing charge carriers in response to incident ionizing radiation; and a plurality of electrodes (34) corresponding to pixels for registering the charge carriers and generate a signal corresponding to registered charge carriers; wherein an electrode of the plurality of electrodes (34) is structured to two-dimensionally intertwine with at least two adjacent electrodes to register the charge carriers by said electrode and by at least one adjacent electrode. The present invention further relates to a detection method and to an imaging apparatus.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: August 21, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ewald Roessl, Christoph Herrmann, Roger Steadman Booker, Klaus Jürgen Engel
  • Patent number: 10048391
    Abstract: An imaging detector module (112) of an imaging system includes at least one detector pixel (114) and self-diagnosing circuitry (116). The self-diagnosing circuitry includes a microprocessor (202) and at least measurement device (210). The microprocessor controls the at least measurement device to measure at least one parameter of the at least one detector pixel, wherein a value of the at least one parameter is indicative of a health state of the imaging system. A method includes employing self-diagnosing circuitry embedded in an imaging detector module to measure at least one parameter of at least one detector pixel of the imaging detector module. A value of the at least one parameter is indicative of a health state of the imaging detector. The method further includes generating, with the self diagnosing circuitry, a signal indicating a health state of the imaging detector module based on the measured at least one parameter.
    Type: Grant
    Filed: November 21, 2014
    Date of Patent: August 14, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Gereon Vogtmeier
  • Publication number: 20180196149
    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: Application
    Filed: July 4, 2016
    Publication date: July 12, 2018
    Inventors: Ira Micah BLEVIS, Roger STEADMAN BOOKER, Christoph HERRMANN
  • Patent number: 9955930
    Abstract: The present invention relates to a sensor device for detecting radiation signals. To enable high signal integrity and cost efficiency while maintaining the capability of being four-sidedly buttable, the proposed sensor device comprises a sensor array (22) comprising a plurality of detectors (11, 11a-d), a sensor element (14) for converting said received radiation signals (74, 74?) into a plurality of corresponding electric signals, an interposer element (16, 16a-d) extending laterally between a first side (28) and a second side (30), and an integrated circuit element (18, 18a-d). The interposer element (16, 16a-d) comprises a front surface (24) facing said sensor element (14) and a back surface (26) parallel to said front surface (24), wherein a front contact arrangement (36) is provided on said front surface (24) for directing said electric signals to a back contact arrangement (40) provided on said back surface (26).
    Type: Grant
    Filed: November 2, 2015
    Date of Patent: May 1, 2018
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Amir Livne
  • Publication number: 20170357013
    Abstract: The present invention relates to a detector (22?) for detecting ionizing radiation, comprising: a directly converting semi-conductor layer (36) for producing charge carriers in response to incident ionizing radiation; and a plurality of electrodes (34) corresponding to pixels for registering the charge carriers and generate a signal corresponding to registered charge carriers; wherein an electrode of the plurality of electrodes (34) is structured to two-dimensionally intertwine with at least two adjacent electrodes to register the charge carriers by said electrode and by at least one adjacent electrode. The present invention further relates to a detection method and to an imaging apparatus.
    Type: Application
    Filed: December 11, 2015
    Publication date: December 14, 2017
    Inventors: Ewald ROESSL, Christoph HERRMANN, Roger STEADMAN BOOKER, Klaus Jürgen ENGEL
  • Patent number: 9833202
    Abstract: The invention relates to a system (31) for generating spectral computed tomography projection data. A spectral projection data generation device (6) comprising an energy-resolving detector generates spectral computed tomography projection databased on polychromatic radiation (4), which has been provided by a radiation device (2), after having traversed an examination zone (5), and a reference values generation device generates energy-dependent reference values based on radiation, which has not traversed the examination zone. A spectral parameter providing unit (12) provides a spectral parameter being indicative of a spectral property of the radiation device based on the energy-dependent reference values.
    Type: Grant
    Filed: December 1, 2015
    Date of Patent: December 5, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Heiner Daerr, Roger Steadman Booker, Gereon Vogtmeier, Ewald Roessl, Gerhard Martens, Carolina Ribbing
  • Patent number: 9829377
    Abstract: The present invention relates to a detection device (6) for detecting photons emitted by a radiation source (2) and capable of adjusting ballistic deficit. The detection device (6) comprises a pre-amplifying unit (11) (such as, e.g., a charge-sensitive amplifier), a shaping unit (60) comprising a feedback discharge unit (13, I) (such as, e.g., a feedback resistor or a feedback current source), and a feedback discharge control unit (50) coupled to the feedback discharge unit (13, I). The feedback discharge control unit (50) is adapted to, e.g., adjust a resistance of a feedback resistor (and/or to adjust the current value of the feedback current source) if an electrical pulse generated by the shaping unit (60) does not exceed at least one energy comparison value (X1, X2, . . . , XN). The feedback discharge control unit (50) is adapted to not adjust the parameter of the feedback discharge unit (13, I) if the electrical pulse exceeds the at least one energy comparison value (X1, X2, . . . , XN).
    Type: Grant
    Filed: November 7, 2014
    Date of Patent: November 28, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Christoph Herrmann
  • Publication number: 20170258412
    Abstract: The invention relates to a system (31) for generating spectral computed tomography projection data. A spectral projection data generation device (6) comprising an energy-resolving detector generates spectral computed tomography projection databased on polychromatic radiation (4), which has been provided by a radiation device (2), after having traversed an examination zone (5), and a reference values generation device generates energy-dependent reference values based on radiation, which has not traversed the examination zone. A spectral parameter providing unit (12) provides a spectral parameter being indicative of a spectral property of the radiation device based on the energy-dependent reference values.
    Type: Application
    Filed: December 1, 2015
    Publication date: September 14, 2017
    Inventors: Heiner DAERR, Roger STEADMAN BOOKER, Gereon VOGTMEIER, Ewald ROESSL, Gerhard MARTENS, Carolina RIBBING
  • Patent number: 9759822
    Abstract: The present invention relates to a detection device (6) for detecting photons emitted by a radiation source (2). The detection device (6) is configured to detect the photons during a first time period. The detection device (6) comprises a sensor (10) having an intermediate direct conversion material for converting photons into electrons and holes, a shaping element (20), and a compensation unit (450, INT, 950). The compensation unit (450, INT, 950) is adapted to provide a compensation signal based on the electrical pulse and on a photoconductive gain of said sensor (10). The core of the invention is to provide circuits to reduce artifacts due to inherent errors with direct conversion detectors in spectral computed tomography by determining a compensation current, by detecting or monitoring a baseline restorer feedback signal, or by ignoring signals above the baseline level.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: September 12, 2017
    Assignee: Koninklijke Philips N.V.
    Inventors: Heiner Daerr, Christoph Herrmann, Frank Bergner, Roger Steadman Booker
  • Patent number: 9753157
    Abstract: The invention relates to a radiation detector (100?) and a method for detecting radiation, particularly for detecting X-rays (X) in a CT imaging apparatus (1000?). According to a preferred embodiment, the radiation detector (100?) comprises a conversion element (110) for converting incident radiation (X) into electrical signals which are read out and processed by a readout circuit (120). A heating device comprising the heat source (135?) of a Peltier element is provided with which the conversion element (110) can controllably be heated in order to reduce negative effects, e.g. of polarization, on image accuracy, wherein the heat sink (137?) of the Peltier element is oriented towards the readout circuit.
    Type: Grant
    Filed: September 15, 2015
    Date of Patent: September 5, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Christoph Herrmann, Frank Verbakel
  • Patent number: 9753156
    Abstract: The invention relates to a detector (6) for detecting radiation, especially x-ray radiation used in a computed tomography system. The detector comprises a direct conversion material (9) for converting radiation into electrons and holes, which are used for generating an electrical detection signal. The direct conversion material is illuminated with illumination light being broadband visible and/or broadband infrared light for reducing, in particular, eliminating, a polarization of the direct conversion material, which may occur when being traversed by the radiation to be detected and which may reduce the detection performance. By reducing the polarization of the direct conversion material the detection performance can be improved.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: September 5, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Frank Verbakel, Klaus Juergen Engel, Antonius Johannes Maria Nellissen, Herfried Karl Wieczorek, Eric Cornelius Egbertus Van Grunsven, Ira Micah Blevis, Roger Steadman Booker
  • Publication number: 20170227658
    Abstract: The present invention relates to a sensor device for detecting radiation signals. To enable high signal integrity and cost efficiency while maintaining the capability of being four-sidedly buttable, the proposed sensor device comprises a sensor array (22) comprising a plurality of detectors (11, 11a-d), a sensor element (14) for converting said received radiation signals (74, 74?) into a plurality of corresponding electric signals, an interposer element (16, 16a-d) extending laterally between a first side (28) and a second side (30), and an integrated circuit element (18, 18a-d). The interposer element (16, 16a-d) comprises a front surface (24) facing said sensor element (14) and a back surface (26) parallel to said front surface (24), wherein a front contact arrangement (36) is provided on said front surface (24) for directing said electric signals to a back contact arrangement (40) provided on said back surface (26).
    Type: Application
    Filed: November 2, 2015
    Publication date: August 10, 2017
    Inventors: Roger STEADMAN BOOKER, Amir LIVNE
  • Publication number: 20170192110
    Abstract: The invention relates to a radiation detector (100?) and a method for detecting radiation, particularly for detecting X-rays (X) in a CT imaging apparatus (1000?). According to a preferred embodiment, the radiation detector (100?) comprises a conversion element (110) for converting incident radiation (X) into electrical signals which are read out and processed by a readout circuit (120). A heating device comprising the heat source (135?) of a Peltier element is provided with which the conversion element (110) can controllably be heated in order to reduce negative effects, e.g. of polarization, on image accuracy, wherein the heat sink (137?) of the Peltier element is oriented towards the readout circuit.
    Type: Application
    Filed: September 15, 2015
    Publication date: July 6, 2017
    Inventors: Roger STEADMAN BOOKER, Christoph HERRMANN, Frank VERBAKEL
  • Patent number: 9664797
    Abstract: The invention relates to a detector unit (100) for the detection of photons of incident radiation. The detector unit (100) comprises a signal processing circuit (40, 50, 60) for generating signals (V0) that are dependent on the energy of a currently detected photon (X) and at least one processing-parameter (Rf). Moreover, it comprises a flux estimator (70) for estimating the flux of photons and for adjusting the processing-parameter (Rf) based on said estimated flux. The flux estimator (70) receives its input (Vi), from which the flux of photons is estimated, from a processing stage that is independent of the output of the signal processing circuit. In a preferred embodiment, the signal processing circuit is or comprises a shaper (40).
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: May 30, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ewald Roessl, Roger Steadman-Booker
  • Patent number: 9664558
    Abstract: The invention relates to radiation detection with a directly converting semiconductor layer for converting an incident radiation into electrical signals. Sub-band infra-red (IR) irradiation considerably reduces polarization in the directly converting semi-conductor material when irradiated, so that counting is possible at higher tube currents without any baseline shift. An IR irradiation device is integrated into the readout circuit to which the crystal is flip-chip bonded in order to enable 4-side-buttable crystals.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: May 30, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Christoph Herrmann, Roger Steadman Booker
  • Patent number: 9625589
    Abstract: The invention relates to a method and an X-ray detector (100) for detecting incident X-ray photons (X). The X-ray detector (100) comprises at least one sensor unit (105) in which X-ray photons (X) are converted into sensor signals (s) and at least one flux sensor (104) for generating a flux signal (f) related to the flux of photons (X). The sensor signals (s) are corrected based on the flux signal (f). In a preferred embodiment, the sensor signals (s) represent a spectrally resolved pulse counting. The flux sensor (104) may be integrated into an ASIC (103) that is coupled to the sensor unit (105).
    Type: Grant
    Filed: July 15, 2013
    Date of Patent: April 18, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Ewald Roessl, Daerr Heiner, Roger Steadman Booker