Patents by Inventor Marc Chappo

Marc Chappo 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: 12257083
    Abstract: Saturation in at least one saturated ray is in a method including identifying a saturated ray corresponding to a first ray of a radiation source received at a radiation detector after passing through a reference point during a current view of the radiation detector, identifying at least one non-saturated ray corresponding to a second ray of the radiation source received at the radiation detector, and responsive to the identifying, adjusting a value for the saturated ray based on a value of the at least one non-saturated ray. The non-saturated ray can be a ray from an adjacent view of a current rotation, an adjacent view of a previous or subsequent rotation, or a conjugate ray. Methods of selecting a gain level to avoid saturation are also disclosed.
    Type: Grant
    Filed: February 7, 2022
    Date of Patent: March 25, 2025
    Assignee: Accuray Inc.
    Inventors: Zhicong Yu, Amit Jain, Daniel Gagnon, Chuanyong Bai, Marc Chappo
  • Publication number: 20240350833
    Abstract: Disclosed herein is a treatment apparatus. The treatment apparatus includes a rotatable gantry system positioned at least partially around a patient support and a first source of radiation coupled to the rotatable gantry system. The first source of radiation is configured to emit imaging x-ray radiation after pausing for a time interval between periodic emissions. The apparatus further includes a radiation detector configured to receive x-ray radiation from the first radiation source and generate tomographic data from the received radiation. The radiation detector is subject to a transient effect caused by at least one of polarization and charge trapping. The time interval is sufficiently long for the transient effect to substantially dissipate.
    Type: Application
    Filed: April 23, 2024
    Publication date: October 24, 2024
    Applicant: Accuray, Inc.
    Inventors: Georgios Prekas, Marc Chappo, Zhicong Yu, Daniel Gagnon
  • Publication number: 20230248329
    Abstract: Saturation in at least one saturated ray is in a method including identifying a saturated ray corresponding to a first ray of a radiation source received at a radiation detector after passing through a reference point during a current view of the radiation detector, identifying at least one non-saturated ray corresponding to a second ray of the radiation source received at the radiation detector, and responsive to the identifying, adjusting a value for the saturated ray based on a value of the at least one non-saturated ray. The non-saturated ray can be a ray from an adjacent view of a current rotation, an adjacent view of a previous or subsequent rotation, or a conjugate ray. Methods of selecting a gain level to avoid saturation are also disclosed.
    Type: Application
    Filed: February 7, 2022
    Publication date: August 10, 2023
    Applicant: Accuray Inc.
    Inventors: Zhicong Yu, Amit Jain, Daniel Gagnon, Chuanyong Bai, Marc Chappo
  • Publication number: 20130292575
    Abstract: An imaging detector includes processing electronics with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array and a scintillator array of the detector. In another instance, the imaging detector includes an A/D converter that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter, an integrator offset voltage signal determiner, and a logic unit, wherein the determiner induces an electrical current via an offset voltage, the A/D converter measures the current, and the logic unit calculates a resistance of the photosensor array based on the reference voltage and the measured current.
    Type: Application
    Filed: July 11, 2013
    Publication date: November 7, 2013
    Inventors: Marc CHAPPO, Randall P. LUHTA, Christopher J. VRETTOS, Brian E. HARWOOD
  • Patent number: 8563941
    Abstract: An imaging detector includes processing electronics with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array and a scintillator array of the detector. In another instance, the imaging detector includes an A/D converter that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter, an integrator offset voltage signal determiner, and a logic unit, wherein the determiner induces an electrical current via an offset voltage, the A/D converter measures the current, and the logic unit calculates a resistance of the photosensor array based on the reference voltage and the measured current.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: October 22, 2013
    Assignee: Koninklijke Philips N.V.
    Inventors: Marc Chappo, Randall P. Luhta, Christopher J. Vrettos, Brian E. Harwood
  • Patent number: 8525122
    Abstract: An imaging detector includes processing electronics (208) with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array (204) and a scintillator array (202) of the detector. In another instance, the imaging detector includes an A/D converter (302) that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit (308) that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter (302), an integrator offset voltage signal determiner (318), and a logic unit (308), wherein the determiner (318) induces an electrical current via an offset voltage, the A/D converter (302) measures the current, and the logic unit (308) calculates a resistance of the photosensor array (204) based on the reference voltage and the measured current.
    Type: Grant
    Filed: February 18, 2010
    Date of Patent: September 3, 2013
    Assignee: Koninklijke Philips N.V.
    Inventors: Marc Chappo, Randall P. Luhta, Christopher J. Vrettos, Brian E. Harwood
  • Publication number: 20120001076
    Abstract: An imaging detector includes processing electronics with a thermal coefficient about equal to a negative of a summation of thermal coefficients of a photosensor array and a scintillator array of the detector. In another instance, the imaging detector includes an A/D converter that alternately converts first charge corresponding to impinging radiation into a first signal and second charge corresponding to decaying charge into a second signal and a logic unit that corrects the first signal based on the second signal. In another instance, the imaging detector includes an A/D converter, an integrator offset voltage signal determiner, and a logic unit, wherein the determiner induces an electrical current via an off-set voltage, the A/D converter measures the current, and the logic unit calculates a resistance of the photosensor array based on the reference voltage and the measured current.
    Type: Application
    Filed: February 18, 2010
    Publication date: January 5, 2012
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Marc Chappo, Randall P. Luhta, Christopher J. Vrettos, Brian E. Harwood
  • Publication number: 20070230654
    Abstract: A diagnostic imaging system (10) includes an x-ray source (16), which is rotated around an examination region (20) on a rotating gantry (14). A subject, disposed on a couch (30), is translated longitudinally through the examination region (20). The imaging system is standardized such that a common subassembly is adapted to receive a bore (24) of any selectable diameter. The common subassembly includes a stationary gantry (12) and a bearing race (52) supported by bearing members (50). Standard motor modules (28), standard power slip ring modules (56), and standard information transmission modules (58) are disposed about the race (52). The number of the standard modules (28, 56, 58) is specified by a user.
    Type: Application
    Filed: March 30, 2005
    Publication date: October 4, 2007
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Marc Chappo, Leonard Plut
  • Publication number: 20060165214
    Abstract: A radiation detector module includes a scintillator (62, 62?, 162, 262) arranged to receive penetrating radiation of a computed tomography apparatus (10). The scintillator produces optical radiation responsive to the penetrating radiation. A detector array (66, 66?, 166, 266) is arranged to convert the optical radiation into electric signals. Electronics (72, 72?, 172, 272) are arranged on a side of the detector array opposite from the scintillator in a path of the penetrating radiation. A radiation shield (86, 86?, 100, 100?, 100?, 186, 210, 210?, 286, 286?) is disposed between the detector array and the electronics to absorb the penetrating radiation that passes through the scintillator. The radiation shield includes openings (90, 90?) that communicate between the detector array and the electronics. Electrical feedthroughs (88, 88?, 102, 102?, 102?, 188, 212, 212?, 288, 288?) pass through the radiation shield openings and electrically connect the detector array and the electronics.
    Type: Application
    Filed: December 17, 2003
    Publication date: July 27, 2006
    Inventors: Rodney Mattson, Randall Luhta, Marc Chappo