Patents by Inventor Qiheng Yang

Qiheng Yang 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).

  • X-ray beam-hardening correction in tomographic reconstruction using the Alvarez-Macovski attenuation model
    Patent number: 10902650
    Abstract: Methods and apparatuses disclosed herein provide beam hardening correction to tomographic reconstruction using a simplification to the Alvarez-Macovski attenuation model. An example method includes simplifying a forward projection model, the forward projection model based on an Alvarez-Macovski (AM) attenuation model, wherein the simplification of the forward projection model simplifies the AM attenuation model for one of photoelectric effect only, constant density, constant atomic number, and density proportional to atomic number, and performing an iterative reconstruction of a sample using the simplified forward projection model, the iterative reconstruction weighted by a first spectrum, wherein measured image data of the sample used in the iterative reconstruction is obtained at a first energy, and wherein a reverse operation of the iterative reconstruction is a non-adjoint to the simplified forward projection model.
    Type: Grant
    Filed: August 23, 2018
    Date of Patent: January 26, 2021
    Assignee: FEI Company
    Inventors: Qiheng Yang, Glenn Myers, Shane Latham, Adrian Sheppard, Andrew Kingston
  • X-ray beam-hardening correction in tomographic reconstruction using the Alvarez-Macovski attenuation model
    Publication number: 20190325618
    Abstract: Methods and apparatuses disclosed herein provide beam hardening correction to tomographic reconstruction using a simplification to the Alvarez-Macovski attenuation model. An example method includes simplifying a forward projection model, the forward projection model based on an Alvarez-Macovski (AM) attenuation model, wherein the simplification of the forward projection model simplifies the AM attenuation model for one of photoelectric effect only, constant density, constant atomic number, and density proportional to atomic number, and performing an iterative reconstruction of a sample using the simplified forward projection model, the iterative reconstruction weighted by a first spectrum, wherein measured image data of the sample used in the iterative reconstruction is obtained at a first energy, and wherein a reverse operation of the iterative reconstruction is a non-adjoint to the simplified forward projection model.
    Type: Application
    Filed: August 23, 2018
    Publication date: October 24, 2019
    Inventors: Qiheng YANG, Glenn MYERS, Shane LATHAM, Adrian SHEPPARD, Andrew Kingston
  • Compositions and methods for cleaving IAP
    Publication number: 20050233411
    Abstract: The present invention relates to compositions and methods for making and using Omi-related and IAP-cleaving nucleotide sequences, mutant nucleotide sequences, and polypeptide sequences expressed therefrom, including both biologically active and inactive molecules. The present invention relates to cleaving IAP using an Omi polypeptide.
    Type: Application
    Filed: December 8, 2003
    Publication date: October 20, 2005
    Inventors: Chunying Du, Qiheng Yang
  • Compositions and methods for cleaving IAP
    Publication number: 20040171105
    Abstract: The present invention relates to compositions and methods for making and using Omi-related and IAP-cleaving nucleotide sequences, mutant nucleotide sequences, and polypeptide sequences expressed therefrom, including both biologically active and inactive molecules. The present invention relates to cleaving IAP using an Omi polypeptide.
    Type: Application
    Filed: December 8, 2003
    Publication date: September 2, 2004
    Inventors: Chunying Du, Qiheng Yang