Patents by Inventor Shigefumi Kakimoto

Shigefumi Kakimoto 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 for setting the current through shim coils and gradient coils in a nuclear magnetic resonance apparatus
    Patent number: 5345178
    Abstract: For calculating the magnetic field inhomogeneity, a gradient echo sequence or a spin echo sequence having a non-central 180.degree. radio-frequency pulse is first carried out. The nuclear magnetic resonance signal thus acquired is Fourier-transformed and the phase curve of the nuclear spins in a given region is identified. This is multiply repeated in different projections. The phase curves that are obtained are analyzed with a fit method and the coefficients of the spherical, harmonic functions describing the field distribution are identified therefrom. The current to be supplied to the individual shim coils and an offset current for the gradient coils can thus be calculated.
    Type: Grant
    Filed: April 19, 1993
    Date of Patent: September 6, 1994
    Assignees: Siemens Aktiengesellschaft, Siemens-Asahi Medical Technologies Ltd.
    Inventors: Atsutaka Manabe, Shigefumi Kakimoto, Yasushiro Wada