Patents by Inventor Weixing Cai

Weixing Cai 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).

  • Method and apparatus of spectral differential phase-contrast cone-beam CT and hybrid cone-beam CT
    Patent number: 10478142
    Abstract: DPC (differential phase contrast) images are acquired for each photon energy channel, which are called spectral DPC images. The final DPC image can be computed by summing up these spectral DPC images or just computed using certain ‘color’ representation algorithms to enhance desired features. In addition, with quasi-monochromatic x-ray source, the required radiation dose is substantially reduced, while the image quality of DPC images remains acceptable.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: November 19, 2019
    Assignee: University of Rochester
    Inventors: Ruola Ning, Weixing Cai
  • Methods and apparatus for differential phase-contrast cone-beam CT and hybrid cone-beam CT
    Patent number: 9826949
    Abstract: A raw DPC (differential phase contrast) image of an object is acquired. The background phase distribution due to the non-uniformity of the grating system is acquired by the same process without an object in place, and the true DPC image of the object is acquired by subtracting the background phase distribution from the raw DPC image.
    Type: Grant
    Filed: March 5, 2013
    Date of Patent: November 28, 2017
    Assignee: University of Rochester
    Inventors: Ruola Ning, Weixing Cai
  • METHOD AND APPARATUS OF SPECTRAL DIFFERENTIAL PHASE-CONTRAST CONE-BEAM CT AND HYBRID CONE-BEAM CT
    Publication number: 20160374635
    Abstract: DPC (differential phase contrast) images are acquired for each photon energy channel, which are called spectral DPC images. The final DPC image can be computed by summing up these spectral DPC images or just computed using certain ‘color’ representation algorithms to enhance desired features. In addition, with quasi-monochromatic x-ray source, the required radiation dose is substantially reduced, while the image quality of DPC images remains acceptable.
    Type: Application
    Filed: April 21, 2016
    Publication date: December 29, 2016
    Applicant: University of Rochester
    Inventors: Ruola Ning, Weixing Cai
  • Method and apparatus of spectral differential phase-contrast cone-beam CT and hybrid cone-beam CT
    Patent number: 9364191
    Abstract: DPC (differential phase contrast) images are acquired for each photon energy channel, which are called spectral DPC images. The final DPC image can be computed by summing up these spectral DPC images or just computed using certain ‘color’ representation algorithms to enhance desired features. In addition, with quasi-monochromatic x-ray source, the required radiation dose is substantially reduced, while the image quality of DPC images remains acceptable.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: June 14, 2016
    Assignee: UNIVERSITY OF ROCHESTER
    Inventors: Ruola Ning, Weixing Cai
  • METHODS AND APPARATUS FOR DIFFERENTIAL PHASE-CONTRAST CONE-BEAM CT AND HYBRID CONE-BEAM CT
    Publication number: 20160022235
    Abstract: A raw DPC (differential phase contrast) image of an object is acquired. The background phase distribution due to the non-uniformity of the grating system is acquired by the same process without an object in place, and the true DPC image of the object is acquired by subtracting the background phase distribution from the raw DPC image.
    Type: Application
    Filed: March 5, 2013
    Publication date: January 28, 2016
    Inventors: Ruola NING, Weixing CAI
  • METHOD AND APPARATUS OF SPECTRAL DIFFERENTIAL PHASE-CONTRAST CONE-BEAM CT AND HYBRID CONE-BEAM CT
    Publication number: 20140226783
    Abstract: DPC (differential phase contrast) images are acquired for each photon energy channel, which are called spectral DPC images. The final DPC image can be computed by summing up these spectral DPC images or just computed using certain ‘color’ representation algorithms to enhance desired features. In addition, with quasi-monochromatic x-ray source, the required radiation dose is substantially reduced, while the image quality of DPC images remains acceptable.
    Type: Application
    Filed: March 15, 2013
    Publication date: August 14, 2014
    Applicant: University of Rochester
    Inventors: Ruola NING, Weixing CAI
  • Methods and apparatus for differential phase-contrast fan beam CT, cone-beam CT and hybrid cone-beam CT
    Patent number: 7949095
    Abstract: A device for imaging an object, such as for breast imaging, includes a gantry frame having mounted thereon an x-ray source, a source grating, a holder or other place for the object to be imaged, a phase grating, an analyzer grating, and an x-ray detector. The device images objects by differential-phase-contrast cone-beam computed tomography. A hybrid system includes sources and detectors for both conventional and differential-phase-contrast computed tomography.
    Type: Grant
    Filed: February 12, 2010
    Date of Patent: May 24, 2011
    Assignee: University of Rochester
    Inventors: Ruola Ning, Weixing Cai
  • METHODS AND APPARATUS FOR DIFFERENTIAL PHASE-CONTRAST FAN BEAM CT, CONE-BEAM CT AND HYBRID CONE-BEAM CT
    Publication number: 20100220832
    Abstract: A device for imaging an object, such as for breast imaging, includes a gantry frame having mounted thereon an x-ray source, a source grating, a holder or other place for the object to be imaged, a phase grating, an analyzer grating, and an x-ray detector. The device images objects by differential-phase-contrast cone-beam computed tomography. A hybrid system includes sources and detectors for both conventional and differential-phase-contrast computed tomography.
    Type: Application
    Filed: February 12, 2010
    Publication date: September 2, 2010
    Applicant: University of Rochester
    Inventors: Ruola Ning, Weixing Cai
  • Phase contrast cone-beam CT imaging
    Publication number: 20070274435
    Abstract: A cone beam CT imaging system incorporates the phase contrast in-line method, in which the phase coefficient rather than only the attenuation coefficient is used to reconstruct the image. Starting from the interference formula of in-line holography, the terms in the interference formula can be approximately expressed as a line integral that is the requirement for all CBCT algorithms. So, the CBCT reconstruction algorithms, such as the FDK algorithm, can be applied for the in-line holographic projections.
    Type: Application
    Filed: February 27, 2007
    Publication date: November 29, 2007
    Inventors: Ruola Ning, Weixing Cai