Patents by Inventor Stephen G. Azevedo

Stephen G. Azevedo 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).

  • System-independent characterization of materials using dual-energy computed tomography
    Patent number: 10466183
    Abstract: A system for characterizing the material of an object scanned via a dual-energy computed tomography scanner is provided. The system generates photoelectric and Compton sinograms based on a photoelectric-Compton decomposition of low-energy and high-energy sinograms generated from the scan and based on a scanner spectral response model. The system generates a Compton volume with Compton attenuation coefficients from the Compton sinogram and a photoelectric volume with photoelectric attenuation coefficients from the photoelectric sinogram. The system generates an estimated effective atomic number for a voxel and an estimated electron density for the voxel from the Compton attenuation coefficient and photoelectric coefficient for the voxel and scanner-specific parameters. The system then characterizes the material within the voxel based on the estimated effective atomic number and estimated electron density for the voxel.
    Type: Grant
    Filed: October 31, 2016
    Date of Patent: November 5, 2019
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Isaac Seetho, Maurice B. Aufderheide, Stephen G. Azevedo, William D. Brown, Kyle Champley, Daniel Schneberk, G. Patrick Roberson, Jeffrey S. Kallman, Harry E. Martz, Jr., Jerel A. Smith
  • SYSTEM-INDEPENDENT CHARACTERIZATION OF MATERIALS USING DUAL-ENERGY COMPUTED TOMOGRAPHY
    Publication number: 20180120241
    Abstract: A system for characterizing the material of an object scanned via a dual-energy computed tomography scanner is provided. The system generates photoelectric and Compton sinograms based on a photoelectric-Compton decomposition of low-energy and high-energy sinograms generated from the scan and based on a scanner spectral response model. The system generates a Compton volume with Compton attenuation coefficients from the Compton sinogram and a photoelectric volume with photoelectric attenuation coefficients from the photoelectric sinogram. The system generates an estimated effective atomic number for a voxel and an estimated electron density for the voxel from the Compton attenuation coefficient and photoelectric coefficient for the voxel and scanner-specific parameters. The system then characterizes the material within the voxel based on the estimated effective atomic number and estimated electron density for the voxel.
    Type: Application
    Filed: October 31, 2016
    Publication date: May 3, 2018
    Inventors: Isaac Seetho, Maurice B. Aufderheide, Stephen G. Azevedo, William D. Brown, Kyle Champley, Daniel Schneberk, G. Patrick Roberson, Jeffrey S. Kallman, Harry E. Martz, JR., Jerel A. Smith
  • Computerized ultrasound risk evaluation system
    Patent number: 7285092
    Abstract: A method and system for examining tissue are provided in which the tissue is maintained in a position so that it may be insonified with a plurality of pulsed spherical or cylindrical acoustic waves. The insonifying acoustic waves are scattered by the tissue so that scattered acoustic radiation including a mix of reflected and transmitted acoustic waves is received. A representation of a portion of the tissue is then derived from the received scattered acoustic radiation.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: October 23, 2007
    Assignee: Barbara Ann Karmanos Cancer Institute
    Inventors: Nebojsa Duric, Peter J. Littrup, Earle Holsapple, III, Robert Henry Barter, Thomas L Moore, Stephen G. Azevedo, Sidney W. Ferguson
  • Diagnostic analysis of ultrasound data
    Patent number: 6984210
    Abstract: A method and apparatus are provided for investigating tissue in which acoustic data are derived from scattering a plurality of pulsed spherical or cylindrical acoustic waves from a plurality of transmission elements through the tissue to a plurality of receiving elements. The acoustic data, which include a mix of reflected and transmitted acoustic waves, are received and digitized, and a representation of a portion of the tissue is generated from the digitized acoustic data.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: January 10, 2006
    Assignee: Barbara Ann Karmanos Cancer Institute
    Inventors: David H. Chambers, Jeffrey Mast, Stephen G. Azevedo, Frank Wuebbeling, Frank Natterer, Neb Duric, Peter J. Littrup, Earle Holsapple
  • Diagnostic analysis of ultrasound data
    Publication number: 20040122325
    Abstract: A method and apparatus are provided for investigating tissue in which acoustic data are derived from scattering a plurality of pulsed spherical or cylindrical acoustic waves from a plurality of transmission elements through the tissue to a plurality of receiving elements. The acoustic data, which include a mix of reflected and transmitted acoustic waves, are received and digitized, and a representation of a portion of the tissue is generated from the digitized acoustic data.
    Type: Application
    Filed: December 18, 2002
    Publication date: June 24, 2004
    Applicant: Barbara Ann Karmanos Cancer Institute
    Inventors: David H. Chambers, Jeffrey Mast, Stephen G. Azevedo, Frank Wuebbeling, Frank Natterer, Nebojsa Duric, Peter J. Littrup, Earle Holsapple
  • Computerized ultrasound risk evaluation system
    Publication number: 20040122304
    Abstract: A method and system for examining tissue are provided in which the tissue is maintained in a position so that it may be insonified with a plurality of pulsed spherical or cylindrical acoustic waves. The insonifying acoustic waves are scattered by the tissue so that scattered acoustic radiation including a mix of reflected and transmitted acoustic waves is received. A representation of a portion of the tissue is then derived from the received scattered acoustic radiation.
    Type: Application
    Filed: December 18, 2002
    Publication date: June 24, 2004
    Applicant: Barbara Ann Karmanos Cancer Institute
    Inventors: Nebojsa Duric, Peter J. Littrup, Earle Holsapple, Robert Henry Barter, Thomas L. Moore, Stephen G. Azevedo, Sidney W. Ferguson