Patents by Inventor Moussa Najib ISKANDAR

Moussa Najib ISKANDAR 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).

  • Magnetoresistive linear position detection in a radiation therapy system
    Patent number: 11771924
    Abstract: A multileaf collimator includes a plurality of movable leaves for shaping a radiotherapy beam, wherein each leaf is independently movable in a same linear travel direction. Each leaf includes a linear array of magnets disposed on a measurement surface of the leaf and an array of magnetoresistive sensors that is disposed proximate the measurement surfaces of the leaves.
    Type: Grant
    Filed: May 28, 2022
    Date of Patent: October 3, 2023
    Assignee: VARIAN MEDICAL SYSTEMS, INC.
    Inventors: Garrett Weston Landrith, Moussa Najib Iskandar, Michael William Weitzel, Chris McWilliams
  • Magnetoresistive rotational position detection in a radiation therapy system
    Patent number: 11692851
    Abstract: A method of measuring a rotational position of an assembly with circumferential ferromagnetic teeth includes applying an excitation signal for a cycle to an actuator, the cycle causing a first rotational displacement of a first ferromagnetic tooth from a first rotational position to a second rotational position and a second rotational displacement of a second ferromagnetic tooth from the second rotational position to a third rotational position. The method further includes measuring a plurality of first signal outputs from a magnetoresistive sensor during the cycle; determining one or more signal offset values based on the plurality of first signal outputs; applying the signal excitation for a portion of a second cycle to the actuator; measuring second signal outputs from the magnetoresistive sensor; generating corrected signals by modifying the second signal outputs with the signal offset values; and, based on the corrected signals, determining a rotational position of the assembly.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: July 4, 2023
    Assignee: VARIAN MEDICAL SYSTEMS, INC.
    Inventors: Moussa Najib Iskandar, Borislav Djurovic
  • MAGNETORESISTIVE LINEAR POSITION DETECTION IN A RADIATION THERAPY SYSTEM
    Publication number: 20220362585
    Abstract: A multileaf collimator includes a plurality of movable leaves for shaping a radiotherapy beam, wherein each leaf is independently movable in a same linear travel direction. Each leaf includes a linear array of magnets disposed on a measurement surface of the leaf and an array of magnetoresistive sensors that is disposed proximate the measurement surfaces of the leaves.
    Type: Application
    Filed: May 28, 2022
    Publication date: November 17, 2022
    Applicant: VARIAN MEDICAL SYSTEMS, INC.
    Inventors: Garrett Weston LANDRITH, Moussa Najib ISKANDAR, Michael William WEITZEL, Chris McWILLIAMS
  • Magnetoresistive linear position detection in a radiation therapy system
    Patent number: 11344749
    Abstract: A multileaf collimator includes a plurality of movable leaves for shaping a radiotherapy beam, wherein each leaf is independently movable in a same linear travel direction. Each leaf includes a linear array of magnets disposed on a measurement surface of the leaf and an array of magnetoresistive sensors that is disposed proximate the measurement surfaces of the leaves.
    Type: Grant
    Filed: October 16, 2020
    Date of Patent: May 31, 2022
    Assignee: VARIAN MEDICAL SYSTEMS, INC.
    Inventors: Garrett Weston Landrith, Moussa Najib Iskandar, Michael William Weitzel, Chris McWilliams
  • MAGNETORESISTIVE LINEAR POSITION DETECTION IN A RADIATION THERAPY SYSTEM
    Publication number: 20220118286
    Abstract: A multileaf collimator includes a plurality of movable leaves for shaping a radiotherapy beam, wherein each leaf is independently movable in a same linear travel direction. Each leaf includes a linear array of magnets disposed on a measurement surface of the leaf and an array of magnetoresistive sensors that is disposed proximate the measurement surfaces of the leaves.
    Type: Application
    Filed: October 16, 2020
    Publication date: April 21, 2022
    Applicant: VARIAN MEDICAL SYSTEMS, INC.
    Inventors: Garrett Weston LANDRITH, Moussa Najib ISKANDAR, Michael William WEITZEL, Chris McWILLIAMS
  • MAGNETORESISTIVE ROTATIONAL POSITION DETECTION IN A RADIATION THERAPY SYSTEM
    Publication number: 20220120588
    Abstract: A method of measuring a rotational position of an assembly with circumferential ferromagnetic teeth includes applying an excitation signal for a cycle to an actuator, the cycle causing a first rotational displacement of a first ferromagnetic tooth from a first rotational position to a second rotational position and a second rotational displacement of a second ferromagnetic tooth from the second rotational position to a third rotational position. The method further includes measuring a plurality of first signal outputs from a magnetoresistive sensor during the cycle; determining one or more signal offset values based on the plurality of first signal outputs; applying the signal excitation for a portion of a second cycle to the actuator; measuring second signal outputs from the magnetoresistive sensor; generating corrected signals by modifying the second signal outputs with the signal offset values; and, based on the corrected signals, determining a rotational position of the assembly.
    Type: Application
    Filed: October 16, 2020
    Publication date: April 21, 2022
    Applicant: VARIAN MEDICAL SYSTEMS, INC.
    Inventors: Moussa Najib ISKANDAR, Borislav DJUROVIC