Patents by Inventor Masateru Iwasa

Masateru Iwasa 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 diagnostic apparatus
    Patent number: 8598879
    Abstract: A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.
    Type: Grant
    Filed: May 16, 2011
    Date of Patent: December 3, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Yoshitomo Sakakura, Satoshi Sugiura, Tomoyuki Yoshida, Takashi Yanashima, Masateru Iwasa, Yutaka Kato, Koji Kitamura, Kazuto Nogami, Hidekazu Tanaka, Makoto Sato, Shigehide Kuhara, Taketo Kawakami, Yasutake Yasuhara, Hiroshi Sugimoto
  • Magnetic resonance imaging apparatus and shimming apparatus with convex to concave layered stacking of shim plates
    Patent number: 8575934
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.
    Type: Grant
    Filed: July 9, 2010
    Date of Patent: November 5, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Masateru Iwasa, Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
  • Magnetic resonance imaging apparatus and gradient coil cooling control method
    Patent number: 8564292
    Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: October 22, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Masateru Iwasa, Kazuto Nogami, Tomoyuki Yoshida, Fumitoshi Kojima, Yoshitomo Sakakura, Kohei Adachi
  • Magnetic resonance imaging apparatus and gradient coil cooling control method
    Patent number: 8305079
    Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.
    Type: Grant
    Filed: September 25, 2009
    Date of Patent: November 6, 2012
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Masateru Iwasa, Kazuto Nogami, Tomoyuki Yoshida, Fumitoshi Kojima, Yoshitomo Sakakura, Kohei Adachi
  • MAGNETIC RESONANCE DIAGNOSTIC APPARATUS
    Publication number: 20110279116
    Abstract: A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.
    Type: Application
    Filed: May 16, 2011
    Publication date: November 17, 2011
    Inventors: Yoshitomo Sakakura, Satoshi Sugiura, Tomoyuki Yoshida, Takashi Yanashima, Masateru Iwasa, Yutaka Kato, Koji Kitamura, Kazuto Nogami, Hidekazu Tanaka, Makoto Sato, Shigehide Kuhara, Taketo Kawakami, Yasutake Yasuhara, Hiroshi Sugimoto
  • MAGNETIC RESONANCE IMAGING APPARATUS AND SHIMMING APPARATUS
    Publication number: 20110006769
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.
    Type: Application
    Filed: July 9, 2010
    Publication date: January 13, 2011
    Inventors: Masateru Iwasa, Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
  • MAGNETIC RESONANCE IMAGING APPARATUS AND GRADIENT COIL COOLING CONTROL METHOD
    Publication number: 20100085053
    Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.
    Type: Application
    Filed: September 25, 2009
    Publication date: April 8, 2010
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSYTEMS CORPORATION
    Inventors: Masateru IWASA, Kazuto NOGAMI, Tomoyuki YOSHIDA, Fumitoshi KOJIMA, Yoshitomo SAKAKURA, Kohei ADACHI