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: 9535174
    Abstract: The present invention discloses a pixilated direct conversion photon counting detector with a direct conversion material layer and a pixilated electrode. Individual electrode pixels are segmented into three segments (510, 520, 530), wherein one of the segments (520) is operated at a more electrically repellant value than that of the other two (510, 530). Said other two segments are connected to electric circuitry (610, 611, 620, 630) that is arranged to generate signals which are indicative of a count of electrons or holes that approach each of the respective electrode pixel segments and to subtract the generated signals from each other.
    Type: Grant
    Filed: September 18, 2013
    Date of Patent: January 3, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Klaus Juergen Engel, Roger Steadman Booker, Christoph Herrmann
  • Patent number: 9535171
    Abstract: The invention relates to a radiation detector (100) and an associated method for the detection of (e.g. X or ?-) radiation. The detector (100) comprises a converter element (110) in which incident photons (X) are converted into electrical signals, and an array of anodes (130) for generating an electrical field (E) in the converter element (110). At least two anodes are associated with two steering electrodes (140) to which different potentials can be applied by a control unit (150). Preferably, each single anode or small group of anodes is surrounded by one steering electrode. The potentials of the steering electrodes (140) may be set as a function of the potentials that are induced in these electrodes when an operating voltage is applied between the anodes and a cathode (120). Moreover, a grid electrode (160) may be provided that at least partially encircles anodes (130) and their steering electrodes (140).
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: January 3, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Christoph Herrmann, Klaus Jurgen Engel, Roger Steadman Booker
  • Patent number: 9535167
    Abstract: An imaging system (100) includes a radiation source (108) that emits radiation that traverses an examination region, a paralyzable photon counting detector pixel (110) that detects photons traversing the examination region and arriving at an input photon rate and that generates a signal indicative thereof, high flux electronics (122) that produce a total time over threshold value each integration period based on the signal, a reconstruction parameter identifier (124) that estimates the input photon rate based on the total time over threshold value and identifies a reconstruction parameter based on the estimate, and a reconstructor (130) that reconstructs the signal based on the identified reconstruction parameter.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: January 3, 2017
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roland Proksa, Roger Steadman Booker
  • Publication number: 20160377745
    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: Application
    Filed: November 20, 2014
    Publication date: December 29, 2016
    Applicant: Koninklijke Philips N.V.
    Inventors: Heiner DAERR, Christoph HERRMANN, Frank BERGNER, Roger STEADMAN BOOKER
  • Publication number: 20160306053
    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 micro processor 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: Application
    Filed: November 21, 2014
    Publication date: October 20, 2016
    Inventors: Roger Steadman Booker, Gereon Vogtmeier
  • Publication number: 20160299002
    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: Application
    Filed: November 7, 2014
    Publication date: October 13, 2016
    Inventors: Roger STEADMAN BOOKER, Christoph HERRMANN
  • Publication number: 20160274249
    Abstract: The present invention relates to a detection module (22) for the detection of ionizing radiation emitted by a radiation source (20) comprising a scintillator element (24) for emitting scintillation photons in response to incident ionizing radiation, a first photosensitive element (32a) optically coupled to the scintillator element (24) for capturing scintillation photons (30) and a flexible substrate (34) for supporting the first photosensitive element (32a). The present invention also relates to an imaging device (10) that comprises such a detection module (22).
    Type: Application
    Filed: November 17, 2014
    Publication date: September 22, 2016
    Inventors: Gereon VOGTMEIER, Roger STEADMAN BOOKER
  • Patent number: 9335424
    Abstract: An apparatus includes an integrator (120) that produces a pulse having a peak amplitude indicative of the energy of a detected photon. First discharging circuitry (136) discharges the integrator (120) at a first discharging speed, and second discharging circuitry (124) discharges the integrator (120) at a second discharging speed. The first discharging speed is less than the second discharging speed.
    Type: Grant
    Filed: May 23, 2008
    Date of Patent: May 10, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Christoph Herrmann, Roger Steadman, Christian Baeumer, Guenter Zeitler
  • Patent number: 9301378
    Abstract: An imaging system (300) includes a detector array (314) with direct conversion detector pixels that detect radiation traversing an examination region of the imaging system and generate a signal indicative of the detected radiation, a pulse shaper (316) configured to alternatively process the signal indicative of detected radiation generated by the detector array or a set of test pulses having different and known heights that correspond to different and known energy levels and to generate output pulses having heights indicative of the energy of the processed detected radiation or set of test pulses, and a thresholds adjuster (330) configured to analyze the heights of the output pulses corresponding to the set of test pulses in connection with the heights of set of test pulses and a set of predetermined fixed energy thresholds and generate a threshold adjustment signal indicative of a baseline based on a result of the analysis.
    Type: Grant
    Filed: October 12, 2012
    Date of Patent: March 29, 2016
    Assignee: KONINKLIJKE PHILIPS N.V.
    Inventors: Roger Steadman Booker, Randall Peter Luhta, Christoph Herrmann
  • Publication number: 20160076935
    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: Application
    Filed: April 17, 2014
    Publication date: March 17, 2016
    Inventors: Heiner DAERR, Klaus Juergen ENGEL, Christoph HERRMANN, Roger STEADMAN BOOKER, Ewald ROESSL
  • Publication number: 20150362604
    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: Application
    Filed: February 28, 2014
    Publication date: December 17, 2015
    Inventors: Frank VERBAKEL, Klaus Juergen ENGEL, Antonius Johannes Maria NELLISSEN, Herfried Karl WIECZOREK, Eric Cornelis Egbertus VAN GRUNSVEN, Ira Micah BLEVIS, Roger STEADMAN BOOKER
  • Patent number: 9176238
    Abstract: The invention relates to a detection device (6) for detecting photons emitted by a radiation source (2). A signal generation unit (20) generates a detection signal indicative of the energy of a detected photon while photons strike the detection device (6), and a baseline signal, which is affected by photons that previously struck the detection device (6), while photons are prevented from striking the detection device (6). A baseline shift determination unit (40) determines a baseline shift of the detection signal depending on the baseline signal. An energy determination unit (30) determines the energy of a detected photon depending on the detection signal and the determined baseline shift. Since the baseline shift of the detection signal is determined from a baseline signal that is generated while photons are prevented from striking the detection device (6), the baseline shift can be determined with higher accuracy, resulting in an improved energy determination.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: November 3, 2015
    Assignee: Koninklijke Philips N.V.
    Inventors: Christoph Herrmann, Roger Steadman Booker, Oliver Muelhens
  • Publication number: 20150309188
    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: Application
    Filed: December 12, 2013
    Publication date: October 29, 2015
    Inventors: Ewald ROESSL, Roger STEADMAN-BOOKER
  • Publication number: 20150285676
    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: Application
    Filed: November 8, 2013
    Publication date: October 8, 2015
    Inventors: Christoph Herrmann, Roger Steadman Booker
  • Publication number: 20150234058
    Abstract: The present invention discloses a pixilated direct conversion photon counting detector with a direct conversion material layer and a pixilated electrode. Individual electrode pixels are segmented into three segments (510, 520, 530), wherein one of the segments (520) is operated at a more electrically repellant value than that of the other two (510, 530). Said other two segments are connected to electric circuitry (610, 611, 620, 630) that is arranged to generate signals which are indicative of a count of electrons or holes that approach each of the respective electrode pixel segments and to subtract the generated signals from each other.
    Type: Application
    Filed: September 18, 2013
    Publication date: August 20, 2015
    Inventors: Klaus Juergen Engel, Roger Steadman Booker, Christoph Herrmann
  • Publication number: 20150234059
    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: Application
    Filed: July 15, 2013
    Publication date: August 20, 2015
    Inventors: Ewald Roessl, Daerr Heiner, Roger Steadman Booker
  • Patent number: 9063240
    Abstract: A radiation detector assembly (20) includes a detector array module (40) configured to convert radiation particles to electrical detection pulses, and an application specific integrated circuit (ASIC) (42) operatively connected with the detector array. The ASIC includes signal processing circuitry (60) configured to digitize an electrical detection pulse received from the detector array, and test circuitry (80) configured to inject a test electrical pulse into the signal processing circuitry. The test circuitry includes a current meter (84) configured to measure the test electrical pulse injected into the signal processing circuitry, and a charge pulse generator (82) configured to generate a test electrical pulse that is injected into the signal processing circuitry.
    Type: Grant
    Filed: December 7, 2010
    Date of Patent: June 23, 2015
    Assignee: Koninklijke Philips N.V.
    Inventors: Christoph Herrmann, Roger Steadman, Oliver Muelhens
  • Publication number: 20140254749
    Abstract: An imaging system (300) includes a detector array (314) with direct conversion detector pixels that detect radiation traversing an examination region of the imaging system and generate a signal indicative of the detected radiation, a pulse shaper (316) configured to alternatively process the signal indicative of detected radiation generated by the detector array or a set of test pulses having different and known heights that correspond to different and known energy levels and to generate output pulses having heights indicative of the energy of the processed detected radiation or set of test pulses, and a thresholds adjuster (330) configured to analyze the heights of the output pulses corresponding to the set of test pulses in connection with the heights of set of test pulses and a set of predetermined fixed energy thresholds and generate a threshold adjustment signal indicative of a baseline based on a result of the analysis.
    Type: Application
    Filed: October 12, 2012
    Publication date: September 11, 2014
    Inventors: Roger Steadman Booker, Randall Peter Luhta, Christoph Herrmann
  • Patent number: 8774353
    Abstract: The invention relates to a radiation detector (100) comprising a converter element (113) with an array (120) of first electrodes (121) for sampling electrical signals generated by incident radiation (X). With a connection circuit (130), at least two first electrodes (121) can selectively be coupled to a common readout unit (141) according to a given connection pattern (CP1). The effective pixel size along the path of incident radiation (X) can thus be adapted to the distribution of electrical signals, which is usually determined by the spectral composition of the incident radiation.
    Type: Grant
    Filed: November 9, 2009
    Date of Patent: July 8, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Christoph Herrmann, Christian Baeumer, Roger Steadman Booker
  • Patent number: 8723132
    Abstract: The invention relates to a radiation detector that is particularly suited for energy resolved single X-ray photon detection in a CT scanner. In a preferred embodiment, the detector has an array of scintillator elements in which incident X-ray photons are converted into bursts of optical photons. Pixels associated to the scintillator elements determine the numbers of optical photons they receive within predetermined acquisition intervals. These numbers can then be digitally processed to detect single X-ray photons and to determine their energy. The pixels may particularly be realized by avalanche photodiodes with associated digital electronic circuits for data processing.
    Type: Grant
    Filed: March 12, 2009
    Date of Patent: May 13, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Christian Baeumer, Thomas Frach, Christoph Herrmann, Gordian Prescher, Torsten Solf, Roger Steadman Booker, Guenter Zeitler