Patents by Inventor Christopher E. Cann

Christopher E. Cann 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: 5376795
    Abstract: Radionuclide emission imaging is improved by correcting emission-transmission data for attenuation along calculated path lengths and through calculated basis material. X-ray transmission data are used to develop an attenuation map through an object which is then used in reconstructing an image based on emission data, Radiation detection circuitry is provided which has different operating modes in detecting the x-ray and emission photons passing through the object. An iterative process is used to reconstruct the radionuclide distribution using the radionuclide projection data and the attenuation map based on physical characteristics of the object being imaged. Subsets of the complete radionuclide projection data are used to reconstruct image subsets of the radionuclide distribution. The image subsets can be generated concurrently with the acquisition of the radionuclide projection data or following acquisition of all data.
    Type: Grant
    Filed: October 9, 1992
    Date of Patent: December 27, 1994
    Assignee: Regents of the University of California
    Inventors: Bruce H. Hasegawa, Robert G. Gould, Thomas F. Lang, J. Keenan Brown, Joseph A. Heanue, Christopher E. Cann
  • Patent number: 5172695
    Abstract: A non-invasive in-vivo method of analyzing a bone for fracture risk includes obtaining data from the bone such as by computed tomography or projection imaging which data represents a measure of bone material characteristics such as bone mineral density. The distribution of the bone material characteristics is used to generate a finite element method (FEM) mesh from which load capability of the bone can be determined. In determining load capability, the bone is mathematically "compressed", and stress, strain force, force/area versus bone material characteristics are determined.
    Type: Grant
    Filed: September 10, 1990
    Date of Patent: December 22, 1992
    Inventors: Christopher E. Cann, Kenneth G. Faulkner
  • Patent number: 5155365
    Abstract: Radionuclide emission imaging is improved by correcting emission transmission data for attenuation along calculated path lengths and through calculated basis material. Single or dual energy projector data can be simultaneously obtained with radionuclide emission data to improve localization of radionuclide uptake. Dual energy x-ray projection techniques are used to calculate the path lengths and basis material (bone, tissue, fat). The radionuclide emission data and the transmitted x-ray data are simultaneously obtained using an energy selective photon detector whereby problems of misregistration are overcome. The dual-energy x-ray projection data are utilized to determine material-specific properties and are recombined into an effectively monoenergetic image, eliminating inaccuracies in material property estimation due to beam hardening. Use of a single instrument for simultaneous data collection also reduces technician time and floor space in a hospital.
    Type: Grant
    Filed: July 9, 1990
    Date of Patent: October 13, 1992
    Inventors: Christopher E. Cann, Bruce H. Hasegawa, Eric L. Gingold