Patents by Inventor Hewei Gao

Hewei Gao 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).

  • Publication number: 20150182176
    Abstract: A system includes an energy-discriminating, photon-counting X-ray detector, comprising a plurality of detector cells providing measurements corresponding to at least two energy bins and being adapted to produce projection data in response to X-ray photons that reach the X-ray detector and to produce an electrical signal having a recorded count for the energy bins and a total energy intensity.
    Type: Application
    Filed: December 31, 2013
    Publication date: July 2, 2015
    Inventors: Yannan Jin, Peter Michael Edic, Vladimir A. Lobastov, Hewei Gao, Geng Fu
  • Publication number: 20150125055
    Abstract: Systems and methods for iterative multi-material correction are provided. A system includes an imager that acquires projection data of an object. A reconstructor reconstructs the acquired projection data into a reconstructed image, utilizes the reconstructed image to perform a multi-material correction on the acquired projection data to generate a multi-material corrected reconstructed image, and utilizes the multi-material corrected reconstructed image to perform one or more iterations of the multi-material correction on the projection data to generate an iteratively corrected multi-material corrected image.
    Type: Application
    Filed: November 1, 2013
    Publication date: May 7, 2015
    Applicant: General Electric Company
    Inventors: Hewei Gao, Girijesh K. Yadava, Adam Israel Cohen, Brian Edward Nett
  • Patent number: 9025815
    Abstract: A method is provided. The method includes acquiring projection data of an object from a plurality of pixels, reconstructing the acquired projection data from the plurality of pixels into a reconstructed image, performing material characterization and decomposition of an image volume of the reconstructed image to reduce a number of materials analyzed in the image volume to two basis materials. The method also includes generating a re-mapped image volume for at least one basis material of the two basis materials, and performing forward projection on at least the re-mapped image volume for the at least one basis material to produce a material-based projection. The method further includes generating multi-material corrected projections based on the material-based projection and a total projection attenuated by the object, which represents both of the two basis materials, wherein the multi-material corrected projections include linearized projections.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: May 5, 2015
    Assignee: General Electric Company
    Inventors: Xiaoye Wu, Jiang Hsieh, Paavana Sainath, Dan Xu, Yannan Jin, Girijesh Kumar Yadava, Adam Israel Cohen, Hewei Gao
  • Publication number: 20140328448
    Abstract: A method is provided. The method includes acquiring projection data of an object from a plurality of pixels, reconstructing the acquired projection data from the plurality of pixels into a reconstructed image, performing material characterization and decomposition of an image volume of the reconstructed image to reduce a number of materials analyzed in the image volume to two basis materials. The method also includes generating a re-mapped image volume for at least one basis material of the two basis materials, and performing forward projection on at least the re-mapped image volume for the at least one basis material to produce a material-based projection. The method further includes generating multi-material corrected projections based on the material-based projection and a total projection attenuated by the object, which represents both of the two basis materials, wherein the multi-material corrected projections include linearized projections.
    Type: Application
    Filed: July 15, 2014
    Publication date: November 6, 2014
    Inventors: Xiaoye Wu, Jiang Hsieh, Paavana Sainath, Dan Xu, Yannan Jin, Girijesh Kumar Yadava, Adam Israel Cohen, Hewei Gao
  • Patent number: 8811709
    Abstract: A method is provided. The method includes acquiring projection data of an object from a plurality of pixels, reconstructing the acquired projection data from the plurality of pixels into a reconstructed image, performing material characterization and decomposition of an image volume of the reconstructed image to reduce a number of materials analyzed in the image volume to two basis materials. The method also includes generating a re-mapped image volume for at least one basis material of the two basis materials, and performing forward projection on at least the re-mapped image volume for the at least one basis material to produce a material-based projection. The method further includes generating multi-material corrected projections based on the material-based projection and a total projection attenuated by the object, which represents both of the two basis materials, wherein the multi-material corrected projections include linearized projections.
    Type: Grant
    Filed: November 14, 2012
    Date of Patent: August 19, 2014
    Assignee: General Electric Company
    Inventors: Xiaoye Wu, Jiang Hsieh, Paavana Sainath, Dan Xu, Yannan Jim, Girijesh Kumar Yadava, Adam Israel Cohen, Hewei Gao
  • Publication number: 20140177810
    Abstract: Exemplary embodiments are directed to a system and method for estimating and compensating for anode target filtration in an X-ray tube. Certain embodiments record changes in the photon flux over the life of the tube. By comparing the flux values, filtration resulting from a roughened target surface and target deposition on the tube window may be inferred. A plurality of systems and methods for comparing flux values are provided and the relative merits and complementary effects of each discussed.
    Type: Application
    Filed: December 21, 2012
    Publication date: June 26, 2014
    Applicant: GE Global Research
    Inventors: Hewei Gao, Floribertus P. Heukensfeldt Jansen, Uwe Wiedmann, Bruno De Man
  • Publication number: 20140133719
    Abstract: A method is provided. The method includes acquiring projection data of an object from a plurality of pixels, reconstructing the acquired projection data from the plurality of pixels into a reconstructed image, performing material characterization and decomposition of an image volume of the reconstructed image to reduce a number of materials analyzed in the image volume to two basis materials. The method also includes generating a re-mapped image volume for at least one basis material of the two basis materials, and performing forward projection on at least the re-mapped image volume for the at least one basis material to produce a material-based projection. The method further includes generating multi-material corrected projections based on the material-based projection and a total projection attenuated by the object, which represents both of the two basis materials, wherein the multi-material corrected projections include linearized projections.
    Type: Application
    Filed: November 14, 2012
    Publication date: May 15, 2014
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Xiaoye Wu, Jiang Hsieh, Paavana Sainath, Dan Xu, Yannan Jin, Girijesh Kumar Yadava, Adam Israel Cohen, Hewei Gao
  • Patent number: 7924975
    Abstract: In a linear track scanning imaging system and method, the imaging system may include: a ray generating unit having a plurality of ray sources that emit beams alternately, only one ray source at a time; an actuating arrangement causing an object under examination to move with respect to the linear track scanning imaging system along a linear track, leading the object to pass through a scanning area of the linear track scanning imaging system; a data collecting unit that collects projection data of the object for each ray source; an imaging unit that reconstructs an image of the object under examination based on the projection data collected for each ray source; and a display unit for displaying the reconstructed image.
    Type: Grant
    Filed: April 7, 2009
    Date of Patent: April 12, 2011
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Li Zhang, Yinong Liu, Zhiqiang Chen, Yuanjing Li, Hewei Gao, Yuxiang Xing, Ziran Zhao, Yongshun Xiao
  • Patent number: 7672427
    Abstract: It is disclosed an imaging system comprising: radiation generating means including at least one radiation source for generating radiations; data acquiring means including an detector matrix faced the radiation source for obtaining projection data by receiving radiations penetrated through an object to be inspected; transporting means for making the object to be inspected between the radiation source and the detector matrix linearly moving relative to the radiation source and the detector matrix; and controlling and image processing means for controlling the radiation generating means, the data acquiring means and the transporting means, and for reconstructing an image of the object to be inspected from the projection data. The imaging system according to the present invention achieves a real stereoscopic radiography by using straight-line trajectory scan and reconstructing a tomographic or stereoscopic image through a straight-line filtered back-projection algorithm.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: March 2, 2010
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Zhiqiang Chen, Li Zhang, Hewei Gao, Kejun Kang, Jianping Cheng, Yuanjing Li, Yinong Liu, Yuxiang Xing, Ziran Zhao, Yongshun Xiao
  • Publication number: 20090262891
    Abstract: In a linear track scanning imaging system and method, the imaging system may include: a ray generating unit having a plurality of ray sources that emit beams alternately, only one ray source at a time; an actuating arrangement causing an object under examination to move with respect to the linear track scanning imaging system along a linear track, leading the object to pass through a scanning area of the linear track scanning imaging system; a data collecting unit that collects projection data of the object for each ray source; an imaging unit that reconstructs an image of the object under examination based on the projection data collected for each ray source; and a display unit for displaying the reconstructed image.
    Type: Application
    Filed: April 7, 2009
    Publication date: October 22, 2009
    Inventors: Li ZHANG, Yinong LIU, Zhiqiang CHEN, Yuanjing LI, Hewei GAO, Yuxiang XING, Ziran ZHAO, Yongshun XIAO
  • Patent number: 7499522
    Abstract: A cargo security inspection system inspecting an object moving through the system, including: a mechanical conveyance unit carrying, conveying, and defining a travel path of the object in the system; a radiation-generating unit generating ray beams for transmitting through the object; and a data collecting unit collecting transmission data about the rays having already transmitted through the object and processing the transmission data; wherein the travel path includes at least two linear sub-paths at an angle relative to each other; the data collecting unit includes at least two detector arrays receiving ray beams, each detector array corresponding to one linear sub-path, a receiving plane of each of the detector arrays disposed parallel to its corresponding linear sub-path; and in use, the radiation-generating and data collecting units remain stationary, and the object travels along its travel path and only translates on the at least two linear sub-paths without any rotation.
    Type: Grant
    Filed: May 8, 2007
    Date of Patent: March 3, 2009
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Zhiqiang Chen, Li Zhang, Kejun Kang, Haifeng Hu, Yuanjing Li, Yinong Liu, Hewei Gao, Ziran Zhao, Yuxiang Xing, Yongshun Xiao, Jianmin Li
  • Patent number: 7424089
    Abstract: It is disclosed a system and a method for reconstructing an image by using a straight-line trajectory scan to avoid image spatial resolution reduction due to interpolations in angular direction and detector direction during data rebinning. This system comprises: a projection data conversion section for converting projection data from straight-line trajectory scan into projection data under quasi-parallel-beam scan; a filtration section for obtaining filtered projection data by convoluting the projection data under quasi-parallel-beam scan with a predetermined convolutional kernel; and a back-projection section for reconstructing an image by back-projecting the filtered projection data with a weighting factor. By using the inventive system and method, the spatial resolution in the reconstructed image is improved, and the influence of data truncation on the reconstructed image is reduced.
    Type: Grant
    Filed: October 12, 2006
    Date of Patent: September 9, 2008
    Assignees: Tsinghua University, Nuctech Company Limited
    Inventors: Li Zhang, Hewei Gao, Zhiqiang Chen, Kejun Kang, Jianping Cheng, Yuanjing Li, Yinong Liu, Yuxiang Xing, Ziran Zhao, Yongshun Xiao
  • Publication number: 20080075226
    Abstract: A cargo security inspection system inspecting an object moving through the system, including: a mechanical conveyance unit carrying, conveying, and defining a travel path of the object in the system; a radiation-generating unit generating ray beams for transmitting through the object; and a data collecting unit collecting transmission data about the rays having already transmitted through the object and processing the transmission data; wherein the travel path includes at least two linear sub-paths at an angle relative to each other; the data collecting unit includes at least two detector arrays receiving ray beams, each detector array corresponding to one linear sub-path, a receiving plane of each of the detector arrays disposed parallel to its corresponding linear sub-path; and in use, the radiation-generating and data collecting units remain stationary, and the object travels along its travel path and only translates on the at least two linear sub-paths without any rotation.
    Type: Application
    Filed: May 8, 2007
    Publication date: March 27, 2008
    Inventors: Zhiqiang Chen, Li Zhang, Kejun Kang, Haifeng Hu, Yuanjing Li, Yinong Liu, Hewei Gao, Ziran Zhao, Yuxiang Xing, Yongshun Xiao, Jianmin Li
  • Publication number: 20070116175
    Abstract: It is disclosed a system and a method for reconstructing an image by using a straight-line trajectory scan to avoid image spatial resolution reduction due to interpolations in angular direction and detector direction during data rebinning. This system comprises: a projection data conversion section for converting projection data from straight-line trajectory scan into projection data under quasi-parallel-beam scan; a filtration section for obtaining filtered projection data by convoluting the projection data under quasi-parallel-beam scan with a predetermined convolutional kernel; and a back-projection section for reconstructing an image by back-projecting the filtered projection data with a weighting factor. By using the inventive system and method, the spatial resolution in the reconstructed image is improved, and the influence of data truncation on the reconstructed image is reduced.
    Type: Application
    Filed: October 12, 2006
    Publication date: May 24, 2007
    Inventors: Li Zhang, Hewei Gao, Zhiqiang Chen, Kejun Kang, Jianping Cheng, Yuanjing Li, Yinong Liu, Yuxiang Xing, Ziran Zhao, Yongshun Xiao
  • Publication number: 20070116177
    Abstract: It is disclosed an imaging system comprising: radiation generating means including at least one radiation source for generating radiations; data acquiring means including an detector matrix faced the radiation source for obtaining projection data by receiving radiations penetrated through an object to be inspected; transporting means for making the object to be inspected between the radiation source and the detector matrix linearly moving relative to the radiation source and the detector matrix; and controlling and image processing means for controlling the radiation generating means, the data acquiring means and the transporting means, and for reconstructing an image of the object to be inspected from the projection data. The imaging system according to the present invention achieves a real stereoscopic radiography by using straight-line trajectory scan and reconstructing a tomographic or stereoscopic image through a straight-line filtered back-projection algorithm.
    Type: Application
    Filed: October 10, 2006
    Publication date: May 24, 2007
    Inventors: Zhiqiang Chen, Li Zhang, Hewei Gao, Kejun Kang, Jianping Cheng, Yuanjing Li, Yinong Liu, Yuxiang Xing, Ziran Zhao, Yongshun Xiao