Patents by Inventor Hirokazu Honma

Hirokazu Honma 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).

  • Magnetic resonance imaging apparatus and method of compensating for error magnetic field
    Patent number: 11789101
    Abstract: Provided are MRI images with excellent image quality and in which the occurrence of artifacts is suppressed by effectively removing a secondary error magnetic field, generated by compensation current (additional current), of eddy current that is caused by applying a gradient magnetic field. The present invention measures and analyzes, in advance, a secondary error magnetic field generated due to the applying of compensation current and saves the results as compensation parameters (secondary compensation parameters), uses the secondary compensation parameters to calculate a correction magnetic field output to be applied to each of a gradient magnetic field coil and a correction coil, and supplies this correction magnetic field output to the gradient magnetic field coil and the correction coil to compensate for (cancel out) the secondary error magnetic field.
    Type: Grant
    Filed: February 7, 2020
    Date of Patent: October 17, 2023
    Assignee: FUJIFILM HEALTHCARE CORPORATION
    Inventors: Naoya Sakaguchi, Syouichi Miyawaki, Hirokazu Honma
  • MAGNETIC RESONANCE IMAGING APPARATUS AND METHOD OF COMPENSATING FOR ERROR MAGNETIC FIELD
    Publication number: 20200333411
    Abstract: Provided are MRI images with excellent image quality and in which the occurrence of artifacts is suppressed by effectively removing a secondary error magnetic field, generated by compensation current (additional current), of eddy current that is caused by applying a gradient magnetic field. The present invention measures and analyzes, in advance, a secondary error magnetic field generated due to the applying of compensation current and saves the results as compensation parameters (secondary compensation parameters), uses the secondary compensation parameters to calculate a correction magnetic field output to be applied to each of a gradient magnetic field coil and a correction coil, and supplies this correction magnetic field output to the gradient magnetic field coil and the correction coil to compensate for (cancel out) the secondary error magnetic field.
    Type: Application
    Filed: February 7, 2020
    Publication date: October 22, 2020
    Applicant: HITACHI, LTD.
    Inventors: Naoya Sakaguchi, Syouichi Miyawaki, Hirokazu Honma