Patents by Inventor Robert T. Constable

Robert T. Constable 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: 20200003856
    Abstract: A method for magnetic resonance imaging uses an electromagnet [304], which may have open geometry, to generate a spatially nonuniform magnetic field within an imaging region [306]. The current through the electromagnet is controlled to repeatedly cycle the nonuniform magnetic field between a high strength for polarizing spins and a low strength for spatial encoding and readout. Using RF coils [308], excitation pulses are generated at a frequency that selects a non-planar isofield slice for imaging. The RF coils are also used to generate refocusing pulses for imaging and to generate spatial encoding pulses, which may be nonlinear. Magnetic resonance signals originating from the selected non-planar isofield slice of the nonuniform magnetic field in the imaging region [306] are detected using the RF coils [308] in parallel receive mode. MRI images are reconstructed from the parallel received magnetic resonance signals, e.g., using algebraic reconstruction.
    Type: Application
    Filed: December 6, 2017
    Publication date: January 2, 2020
    Inventors: Robert T. Constable, Yuqing Wan
  • Patent number: 9229081
    Abstract: In a method of magnetic resonance imaging, a set of nonlinear, mutually orthogonal magnetic gradient encoding fields are sequentially and separately generated in an imaging region [100]. Using multiple receiver coils having nonuniform sensitivity profiles, echo data representing signal intensities in the imaging region is sequentially acquired as the magnetic gradient encoding fields are sequentially generated [102]. A reconstructed image of the imaging region is computed from the acquired echo data [104], and the reconstructed image is then be stored and/or displayed on a display monitor [106].
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: January 5, 2016
    Assignee: Yale University
    Inventors: Robert T. Constable, Jason Stockmann, Lick-Kong Tam, Gigi Galiana
  • Publication number: 20120286783
    Abstract: In a method of magnetic resonance imaging, a set of nonlinear, mutually orthogonal magnetic gradient encoding fields are sequentially and separately generated in an imaging region [100]. Using multiple receiver coils having nonuniform sensitivity profiles, echo data representing signal intensities in the imaging region is sequentially acquired as the magnetic gradient encoding fields are sequentially generated [102]. A reconstructed image of the imaging region is computed from the acquired echo data [104], and the reconstructed image is then be stored and/or displayed on a display monitor [106].
    Type: Application
    Filed: December 22, 2010
    Publication date: November 15, 2012
    Inventors: Robert T. Constable, Jason Stockmann, Lick-Kong Tam, Gigi Galiana
  • Patent number: 5001429
    Abstract: Truncation artifacts in NMR images are reduced by splicing to the truncated data extrapolated high frequency data derived from the truncated image. The truncated data is Fourier transformed into image space and processed with an edge enhancing filter. The retransformed, filtered data yields edge derived high frequency information that may augment the truncated data. The spliced truncated data and edge enhanced data are then reconstructed into an artifact reduced image. In one embodiment, the edge enhancement is performed by iterative passes of a modified Sigma filter. The spliced data is blended with the truncated data near the regions of the splice by means of a weighted average.
    Type: Grant
    Filed: November 21, 1989
    Date of Patent: March 19, 1991
    Assignee: General Electric Company
    Inventors: Robert T. Constable, Ross M. Henkelman