Patents by Inventor Hidehisa Akimaru

Hidehisa Akimaru 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 gradient magnetic field waveform estimation method
    Patent number: 9664765
    Abstract: In order to obtain a highly reliable image with no image distortion or no artifacts, such as ghosting, by compensating for the distortion of an output gradient magnetic field waveform caused by various factors with high accuracy, an input gradient magnetic field waveform and an output gradient magnetic field waveform corresponding to the input gradient magnetic field waveform are calculated, a response function that is a sum of response functions of a plurality of elements affecting the output gradient magnetic field waveform is calculated using the input gradient magnetic field waveform and the output gradient magnetic field waveform, an output gradient magnetic field waveform is calculated from an input gradient magnetic field waveform of a gradient magnetic field pulse set in the imaging sequence using the response function, and various kinds of correction are performed using the calculated value of the calculated output gradient magnetic field waveform.
    Type: Grant
    Filed: June 27, 2012
    Date of Patent: May 30, 2017
    Assignee: HITACHI, LTD.
    Inventors: Hikaru Hanada, Yoshitaka Sato, Kosuke Hirai, Kuniharu Oka, Masahiro Takizawa, Naoya Sakaguchi, Hidehisa Akimaru, Miyuki Kawamura
  • MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT MAGNETIC FIELD WAVERFORM ESTIMATION METHOD
    Publication number: 20140125333
    Abstract: In order to obtain a highly reliable image with no image distortion or no artifacts, such as ghosting, by compensating for the distortion of an output gradient magnetic field waveform caused by various factors with high accuracy, an input gradient magnetic field waveform and an output gradient magnetic field waveform corresponding to the input gradient magnetic field waveform are calculated, a response function that is a sum of response functions of a plurality of elements affecting the output gradient magnetic field waveform is calculated using the input gradient magnetic field waveform and the output gradient magnetic field waveform, an output gradient magnetic field waveform is calculated from an input gradient magnetic field waveform of a gradient magnetic field pulse set in the imaging sequence using the response function, and various kinds of correction are performed using the calculated value of the calculated output gradient magnetic field waveform.
    Type: Application
    Filed: June 27, 2012
    Publication date: May 8, 2014
    Applicant: HITACHI MEDICAL CORPORATION
    Inventors: Hikaru Hanada, Yoshitaka Sato, Kosuke Hirai, Kuniharu Oka, Masahiro Takizawa, Naoya Sakaguchi, Hidehisa Akimaru, Miyuki Kawamura