Patents by Inventor Alexander Hans Vija

Alexander Hans Vija 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: 11494955
    Abstract: For controlling reconstruction in emission tomography, the quality of data for detected emissions and/or the application controls the settings used in reconstruction. For example, a count density of the detected emissions is used to control the number of iterations in reconstruction to more likely avoid over and under fitting. The count density may be adaptively determined by re-binning through pixel size adjustment to find a smallest pixel size providing a sufficient count density. As another example, the detected data may have poor quality due to motion or high body mass index (BMI) of the patient, so the reconstruction is set to perform differently (e.g., less smoothing for high motion or a different number of iterations for high BMI). The quality of the data may be used in conjunction with the application or task for imaging the patient to control the reconstruction.
    Type: Grant
    Filed: June 10, 2020
    Date of Patent: November 8, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Francesc dAssis Massanes Basi, Manjit Ray, Raymond Shi Xu
  • Publication number: 20220346747
    Abstract: Systems and methods for dose calibration. A dose calibrator may include one or more radiation sources, one or more solid-state detectors and one or more plates positioned between the one or more radiation sources and the one or more solid-state detectors. The one or more solid-state detectors capture one or more images based on emissions received from the one or more radiation sources through the one or more plates for estimating activity of the one or more radiation sources.
    Type: Application
    Filed: May 3, 2021
    Publication date: November 3, 2022
    Inventors: Alexander Hans Vija, Miesher Rodrigues
  • Publication number: 20220346730
    Abstract: For calibration in medical emission tomography, the dosimeter and/or detector is calibrated in the field, such as at the clinic or other patient scanning location. To allow for a fewer number of calibration sources used in calibrating and/or assist in calibration for multispectral emission tomography, a calibration source includes multiple isotopes and/or a proxy source or isotope is used instead of the same isotope used in factory calibration.
    Type: Application
    Filed: May 3, 2021
    Publication date: November 3, 2022
    Inventors: Alexander Hans Vija, Miesher Rodrigues
  • Patent number: 11484279
    Abstract: A system and method include acquisition of a plurality of projection images of a subject, each of the projection images associated with a respective projection angle, determination, for each of the projection images, of a center-of-light location in a first image region, determination of a local fluctuation measure based on the determined center-of-light locations, and determination of a quality measure associated with the plurality of projection images based on the local fluctuation measure.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: November 1, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Xinhong Ding
  • Publication number: 20220342091
    Abstract: A system and method include an array of sensors electrically coupled to a material capable of converting a gamma ray to electrical charge, where distances between a center of a first sensor and centers of each sensor immediately-adjacent to the first sensor are substantially equal. Signals are collected from each sensor immediately-adjacent to the first sensor, and one of a plurality of logical sub-pixels of the first sensor is determined based on the signals collected from each sensor immediately-adjacent to the first sensor.
    Type: Application
    Filed: April 13, 2020
    Publication date: October 27, 2022
    Inventors: Alexander Hans Vija, Miesher Rodrigues
  • Publication number: 20220330909
    Abstract: A multi-modality imaging system allows for selectable photoelectric effect and/or Compton effect detection. The camera or detector is a module with a catcher detector. Depending on the use or design, a scatter detector and/or a coded physical aperture are positioned in front of the catcher detector relative to the patient space. For low energies, emissions passing through the scatter detector continue through the coded aperture to be detected by the catcher detector using the photoelectric effect. Alternatively, the scatter detector is not provided. For higher energies, some emissions scatter at the scatter detector, and resulting emissions from the scattering pass by or through the coded aperture to be detected at the catcher detector for detection using the Compton effect. Alternatively, the coded aperture is not provided. The same module may be used to detect using both the photoelectric and Compton effects where both the scatter detector and coded aperture are provided with the catcher detector.
    Type: Application
    Filed: July 6, 2022
    Publication date: October 20, 2022
    Inventors: Alexander Hans Vija, Miesher Rodrigues
  • Publication number: 20220309650
    Abstract: A system and method includes acquisition of a plurality of images, each of the plurality of images representing radiotracer concentration in a respective volume at a respective time period, and training of a neural network, based on the plurality of images, to output data indicative of radiation dose associated with a first volume over a first time period based on a first image representing radiotracer concentration in the first volume over a second time period, the second time period being shorter than the first time period.
    Type: Application
    Filed: March 24, 2021
    Publication date: September 29, 2022
    Inventors: Alexander Hans Vija, Maximilian Reymann
  • Patent number: 11426135
    Abstract: A multi-modality imaging system allows for selectable photoelectric effect and/or Compton effect detection. The camera or detector is a module with a catcher detector. Depending on the use or design, a scatter detector and/or a coded physical aperture are positioned in front of the catcher detector relative to the patient space. For low energies, emissions passing through the scatter detector continue through the coded aperture to be detected by the catcher detector using the photoelectric effect. Alternatively, the scatter detector is not provided. For higher energies, some emissions scatter at the scatter detector, and resulting emissions from the scattering pass by or through the coded aperture to be detected at the catcher detector for detection using the Compton effect. Alternatively, the coded aperture is not provided. The same module may be used to detect using both the photoelectric and Compton effects where both the scatter detector and coded aperture are provided with the catcher detector.
    Type: Grant
    Filed: August 7, 2018
    Date of Patent: August 30, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Miesher Rodrigues
  • Publication number: 20220262049
    Abstract: For partial volume correction, the partial volume effect is simulated using patient-specific segmentation. An organ or other object of the patient is segmented using anatomical imaging. For simulation, the locations of the patient-specific object or objects are sub-divided, creating artificial boundaries in the object. A test activity is assigned to each sub-division and forward projected. The difference of the forward projected activity to the test activity provides a location-by-location partial volume correction map. This correction map is used in reconstruction from the measured emissions, resulting in more accurate activity estimation with less partial volume effect.
    Type: Application
    Filed: May 9, 2022
    Publication date: August 18, 2022
    Inventors: Alexander Hans Vija, Michal Cachovan
  • Patent number: 11361478
    Abstract: For partial volume correction, the partial volume effect is simulated using patient-specific segmentation. An organ or other object of the patient is segmented using anatomical imaging. For simulation, the locations of the patient-specific object or objects are sub-divided, creating artificial boundaries in the object. A test activity is assigned to each sub-division and forward projected. The difference of the forward projected activity to the test activity provides a location-by-location partial volume correction map. This correction map is used in reconstruction from the measured emissions, resulting in more accurate activity estimation with less partial volume effect.
    Type: Grant
    Filed: May 14, 2020
    Date of Patent: June 14, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Michal Cachovan
  • Patent number: 11334987
    Abstract: A system and method includes input of a plurality of sets of training data to a neural network to generate a plurality of sets of output data, determination of a first loss based on the plurality of sets of output data and on the plurality of sets of ground truth data, determination if a second loss based on the plurality of sets of output data and one or more physics-based constraints, and modification of the neural network based on the first loss and the second loss.
    Type: Grant
    Filed: May 6, 2020
    Date of Patent: May 17, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Xinhong Ding, Francesc dAssis Massanes Basi
  • Patent number: 11335040
    Abstract: A system and method include training of an artificial neural network to generate a simulated attenuation-corrected reconstructed volume from an input non-attenuation-corrected reconstructed volume, the training based on a plurality of non-attenuation-corrected volumes generated from respective ones of a plurality of sets of two-dimensional emission data and on a plurality of attenuation-corrected reconstructed volumes generated from respective ones of the plurality of sets of two-dimensional emission data.
    Type: Grant
    Filed: August 28, 2018
    Date of Patent: May 17, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Xinhong Ding, Alexander Hans Vija
  • Publication number: 20220076808
    Abstract: Systems and methods for imaging. An external device may be used to acquire optical image data of a subject. One or more physical parameters of the subject may be determined based on the optical image data. The one or more physical parameters may be translated to one or more properties of the subject. The one or more properties may then be used to generate medical image data of the subject.
    Type: Application
    Filed: September 9, 2020
    Publication date: March 10, 2022
    Inventors: Alexander Hans Vija, Francesc dAssis Massanes Basi
  • Patent number: 11250545
    Abstract: For denoising in SPECT, such as qSPECT, machine learning is used to relate settings to noise structure. Given the SPECT imaging arrangement for a patient, the machine-learned model estimates the structure of the noise. This noise structure may be used to denoise the reconstructed representation.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: February 15, 2022
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Michal Cachovan
  • Publication number: 20220015726
    Abstract: A detector used for tomography imaging is mobile, allowing the detector to move about an object (e.g., patient to be imaged). A swarm of such detectors, such as a swarm of drones with detectors, may be used for tomography imaging. The trajectory or trajectories of the mobile detectors may account for the pose and/or movement of the object being imaged. The trajectory or trajectories may be based, in part, on the sampling for desired tomography. An image of an internal region of the object is reconstructed from detected signals of the mobile detectors using tomography.
    Type: Application
    Filed: September 30, 2021
    Publication date: January 20, 2022
    Inventors: Alexander Hans Vija, Michal Cachovan
  • Publication number: 20210390742
    Abstract: For controlling reconstruction in emission tomography, the quality of data for detected emissions and/or the application controls the settings used in reconstruction. For example, a count density of the detected emissions is used to control the number of iterations in reconstruction to more likely avoid over and under fitting. The count density may be adaptively determined by re-binning through pixel size adjustment to find a smallest pixel size providing a sufficient count density. As another example, the detected data may have poor quality due to motion or high body mass index (BMI) of the patient, so the reconstruction is set to perform differently (e.g., less smoothing for high motion or a different number of iterations for high BMI). The quality of the data may be used in conjunction with the application or task for imaging the patient to control the reconstruction.
    Type: Application
    Filed: June 10, 2020
    Publication date: December 16, 2021
    Inventors: Alexander Hans Vija, Francesc dAssis Massanes Basi, Manjit Ray, Raymond Shi Xu
  • Patent number: 11191515
    Abstract: For SPECT-based internal dose estimation, a portable detector is used to sample activity. The portable detector may selectively use far-field or near-field imaging for a SPECT scan. A camera and/or gyroscope assist in determining emission location and/or aligning activities from the different times. The time-activity curve or another dose is estimated using activities from different times where the activity for at least one time is from the portable detector, which may allow for more frequent sampling of activity and more accurate dose estimation.
    Type: Grant
    Filed: October 23, 2020
    Date of Patent: December 7, 2021
    Assignee: Siemens Medical Solutions USA, Inc
    Inventors: Alexander Hans Vija, Francesc dAssis Massanes Basi, Miesher Rodrigues
  • Patent number: 11182935
    Abstract: A system and method include acquisition of a plurality of sets of images which meet acceptance criteria of an imaging task, each set of images acquired using a respective instance of a type of imaging component, acquisition of a test image using a test instance of the type of imaging component, presentation of a plurality of groups of images, each of the groups of images including the test image and a respective one or more images of the plurality of sets of images, reception, for each group of images, of an indication from an observer of a ranking of the test image of the group with respect to the respective one or more images of the group, and determination of a quality of the test instance of the type of imaging component based on the indications.
    Type: Grant
    Filed: April 2, 2020
    Date of Patent: November 23, 2021
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Francesc dAssis Massanes Basi
  • Patent number: 11160520
    Abstract: A detector used for tomography imaging is mobile, allowing the detector to move about an object (e.g., patient to be imaged). A swarm of such detectors, such as a swarm of drones with detectors, may be used for tomography imaging. The trajectory or trajectories of the mobile detectors may account for the pose and/or movement of the object being imaged. The trajectory or trajectories may be based, in part, on the sampling for desired tomography. An image of an internal region of the object is reconstructed from detected signals of the mobile detectors using tomography.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: November 2, 2021
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Michal Cachovan
  • Patent number: 11151759
    Abstract: An emission image is generated from poor quality emission data. A machine-learned model may be used to recover information. Emission imaging may be provided due to the recovery in a way that at least some diagnostically useful information is made available despite corruption that would otherwise result in less diagnostically useful information or no image at all.
    Type: Grant
    Filed: September 9, 2019
    Date of Patent: October 19, 2021
    Assignee: Siemens Medical Solutions USA, Inc.
    Inventors: Alexander Hans Vija, Michal Cachovan