Patents by Inventor Seiji Nozaki

Seiji Nozaki 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: 20220146607
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry calculates a limit imaging condition based on one or more imaging parameters for determining an imaging condition, the limit imaging condition being an allowable limit relating to heat input to a superconducting magnet. The processing circuitry limits an input range of an imaging parameter input by an operator based on the limit imaging condition.
    Type: Application
    Filed: November 5, 2021
    Publication date: May 12, 2022
    Applicant: Canon Medical Systems Corporation
    Inventors: Hitoshi KANAZAWA, Seiji NOZAKI, Takehiro SHIBUYA
  • Publication number: 20220146610
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry is configured to calculate an allowable amount of heat input to a superconducting magnet, the allowable amount being allocated to each of a plurality of imagings scheduled during a target period. The processing circuitry is configured to determine an imaging condition based on the allowable amount in the each of the plurality of imagings.
    Type: Application
    Filed: November 5, 2021
    Publication date: May 12, 2022
    Applicant: Canon Medical Systems Corporation
    Inventors: Hitoshi KANAZAWA, Seiji NOZAKI, Takehiro SHIBUYA
  • Patent number: 10459046
    Abstract: According to at least one of embodiments, a magnetic resonance imaging apparatus includes a superconducting magnet configured to generate a static magnetic field; a cryocooler configured to cool down the superconducting magnet in a refrigeration cycle in which mechanical fluctuation with a predetermined period is included; a sequence controller configured to acquire magnetic resonance signals for generating a diagnostic image from an object; and processing circuitry configured to correct phase fluctuation included in the magnetic resonance signals for generating a diagnostic image acquired by the sequence controller, the phase fluctuation being generated by periodic fluctuation of the static magnetic field caused by mechanical fluctuation of the cryocooler.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: October 29, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Seiji Nozaki, Satoshi Sugiura
  • Publication number: 20170030991
    Abstract: According to at least one of embodiments, a magnetic resonance imaging apparatus includes a superconducting magnet configured to generate a static magnetic field; a cryocooler configured to cool down the superconducting magnet in a refrigeration cycle in which mechanical fluctuation with a predetermined period is included; a sequence controller configured to acquire magnetic resonance signals for generating a diagnostic image from an object; and processing circuitry configured to correct phase fluctuation included in the magnetic resonance signals for generating a diagnostic image acquired by the sequence controller, the phase fluctuation being generated by periodic fluctuation of the static magnetic field caused by mechanical fluctuation of the cryocooler.
    Type: Application
    Filed: July 15, 2016
    Publication date: February 2, 2017
    Applicant: TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Seiji NOZAKI, Satoshi Sugiura
  • Publication number: 20150123661
    Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a predicting unit and an imaging control unit. The predicting unit predicts a temperature change in a gradient coil at the time a pulse sequence is executed, based on temperature of the gradient coil and current waveform information on a gradient magnetic field pulse, before the pulse sequence is executed. The imaging control unit controls execution of the pulse sequence in accordance with a result of the prediction. The predicting unit predicts the temperature change by separating heat generation in the gradient coil into a component equivalent to heat generation as an electrical resistance of the gradient coil and a component equivalent to heat generation as an inductive circuit induced by switching of the gradient coil.
    Type: Application
    Filed: October 22, 2014
    Publication date: May 7, 2015
    Inventors: Masao YUI, Seiji NOZAKI
  • Patent number: 8922213
    Abstract: In a magnetic resonance imaging apparatus according to an embodiment, a transmitting coil applies a radio-frequency magnetic field to a subject placed in a static magnetic field. A receiving coil receives a magnetic resonance signal emitted from the subject owing to an application of the radio-frequency magnetic field. A balun is connected to the receiving coil, and suppresses an unbalanced current induced in the receiving coil. An overheat protection circuit indicates that the balun is abnormal when a temperature of the balun exceeds a temperature threshold. An imaging control unit stops imaging when the overheat protection circuit indicates an abnormality of the balun.
    Type: Grant
    Filed: April 24, 2013
    Date of Patent: December 30, 2014
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Seiji Nozaki
  • Patent number: 8547102
    Abstract: In a magnetic resonance imaging apparatus according to an embodiment, a transmitting coil applies a radio-frequency magnetic field to a subject placed in a static magnetic field. A receiving coil receives a magnetic resonance signal emitted from the subject owing to an application of the radio-frequency magnetic field. A balun is connected to the receiving coil, and suppresses an unbalanced current induced in the receiving coil. An overheat protection circuit indicates that the balun is abnormal when a temperature of the balun exceeds a temperature threshold. An imaging control unit stops imaging when the overheat protection circuit indicates an abnormality of the balun.
    Type: Grant
    Filed: August 11, 2010
    Date of Patent: October 1, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Seiji Nozaki
  • Publication number: 20130234715
    Abstract: In a magnetic resonance imaging apparatus according to an embodiment, a transmitting coil applies a radio-frequency magnetic field to a subject placed in a static magnetic field. A receiving coil receives a magnetic resonance signal emitted from the subject owing to an application of the radio-frequency magnetic field. A balun is connected to the receiving coil, and suppresses an unbalanced current induced in the receiving coil. An overheat protection circuit indicates that the balun is abnormal when a temperature of the balun exceeds a temperature threshold. An imaging control unit stops imaging when the overheat protection circuit indicates an abnormality of the balun.
    Type: Application
    Filed: April 24, 2013
    Publication date: September 12, 2013
    Applicants: TOSHIBA MEDICAL SYSTEMS CORPORATION, KABUSHIKI KAISHA TOSHIBA
    Inventor: Seiji Nozaki
  • Publication number: 20110037471
    Abstract: In a magnetic resonance imaging apparatus according to an embodiment, a transmitting coil applies a radio-frequency magnetic field to a subject placed in a static magnetic field. A receiving coil receives a magnetic resonance signal emitted from the subject owing to an application of the radio-frequency magnetic field. A balun is connected to the receiving coil, and suppresses an unbalanced current induced in the receiving coil. An overheat protection circuit indicates that the balun is abnormal when a temperature of the balun exceeds a temperature threshold. An imaging control unit stops imaging when the overheat protection circuit indicates an abnormality of the balun.
    Type: Application
    Filed: August 11, 2010
    Publication date: February 17, 2011
    Inventor: Seiji NOZAKI
  • Patent number: 7696753
    Abstract: Data is collected for average units including acquisition of template data and acquisition of imaging data. A frequency difference is calculated between a resonant frequency in a reference average unit and a resonant frequency of an object average unit based on phase variation of the magnetic field between the reference average unit and the object average unit. Corrected phase shift is produced in image data collected in one or more average units based on the frequency difference. An image is reconstructed based on the imaging data collected in the reference average unit and corrected imaging data concerning the object average unit constituted by one or more average units.
    Type: Grant
    Filed: May 30, 2008
    Date of Patent: April 13, 2010
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Seiji Nozaki
  • Patent number: 7656156
    Abstract: A magnetic resonance imaging apparatus includes a phase difference calculation unit configured to perform a one-dimensional Fourier transform on complex data not phase-encoded extracted from complex data of a nuclear resonant signal collected by dynamic scanning, and determining a phase difference in time of data obtained by performing a one-dimensional Fourier transform on the complex data not phase-encoded. A correction unit is configured to correct for non-uniformity of static magnetic field caused during the dynamic scanning, depending upon the phase difference.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: February 2, 2010
    Assignees: Kagushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Seiji Nozaki, Yoshimori Kassai
  • Patent number: 7602185
    Abstract: A magnetic resonance imaging apparatus performs photographing by magnetic resonance imaging using hardware of which temperature is likely to rise due to a photographing operation. The magnetic resonance imaging apparatus includes an obtaining device, an alert state detecting device, and a control device. The obtaining device obtains information providing an indication of temperature of the hardware during the photographing. The alert state detecting device detects the occurrence of an alert state where the temperature of the hardware is likely to rise enough to affect the photographing, on the basis of the obtained information. The control device controls the photographing so as to suppress temperature rise of the hardware according to the detection of the occurrence of the alert state.
    Type: Grant
    Filed: July 8, 2008
    Date of Patent: October 13, 2009
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Seiji Nozaki
  • Publication number: 20090015258
    Abstract: A magnetic resonance imaging apparatus performs photographing by magnetic resonance imaging using hardware of which temperature is likely to rise due to a photographing operation. The magnetic resonance imaging apparatus includes an obtaining device, an alert state detecting device, and a control device. The obtaining device obtains information providing an indication of temperature of the hardware during the photographing. The alert state detecting device detects the occurrence of an alert state where the temperature of the hardware is likely to rise enough to affect the photographing, on the basis of the obtained information. The control device controls the photographing so as to suppress temperature rise of the hardware according to the detection of the occurrence of the alert state.
    Type: Application
    Filed: July 8, 2008
    Publication date: January 15, 2009
    Inventor: Seiji Nozaki
  • Publication number: 20080297153
    Abstract: A method includes collecting data for average units including acquisition of template data and acquisition of imaging data, calculating a frequency difference between a resonant frequency in a reference average unit and a resonant frequency of an object average unit based on a phase variation of the magnetic field in a period where the template data is collected in the reference average unit and a phase variation of the magnetic resonance signal in a period where the template data is collected in the object average unit, correcting a phase shift produced in image data collected in the object average unit constituted by one or more average units based on the frequency difference, and reconstructing an image concerning the subject based on the imaging data collected in the reference average unit and the corrected imaging data concerning the object average unit constituted by one or more average units.
    Type: Application
    Filed: May 30, 2008
    Publication date: December 4, 2008
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventor: Seiji Nozaki
  • Publication number: 20080157766
    Abstract: A magnetic resonance imaging apparatus 20 includes a phase difference calculation unit 44 configured to perform a one-dimensional Fourier transform on complex data not phase-encoded extracted from complex data of a nuclear resonant signal collected by dynamic scanning, and determining a phase difference in time of data obtained by performing a one-dimensional Fourier transform on the complex data not phase-encoded, and a correction unit 50, 51 configured to correct for a non-uniformity of static magnetic field caused during the dynamic scanning, depending upon the phase difference.
    Type: Application
    Filed: February 27, 2008
    Publication date: July 3, 2008
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Seiji Nozaki, Yoshimori Kassai
  • Patent number: 7358728
    Abstract: A magnetic resonance imaging apparatus 20 includes a phase difference calculation unit 44 configured to perform a one-dimensional Fourier transform on complex data not phase-encoded extracted from complex data of a nuclear resonant signal collected by dynamic scanning, and determining a phase difference in time of data obtained by performing a one-dimensional Fourier transform on the complex data not phase-encoded, and a correction unit 50, 51 configured to correct for a non-uniformity of static magnetic field caused during the dynamic scanning, depending upon the phase difference.
    Type: Grant
    Filed: March 23, 2005
    Date of Patent: April 15, 2008
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventors: Seiji Nozaki, Yoshimori Kassai
  • Patent number: 7259563
    Abstract: A magnetic resonance imaging apparatus includes a phased array coil including a plurality of local coils, a pre-scanning unit which pre-scans, before image scanning, an area including at least part of an image scanning area, a determination unit which determines whether each of the local coils is abnormal, based on signals output from the local coils during pre-scanning, and an information supply unit which supplies a user with information indicating an abnormal local coil, if the determination unit determines that the local coils include the abnormal local coil.
    Type: Grant
    Filed: February 14, 2006
    Date of Patent: August 21, 2007
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Seiji Nozaki
  • Publication number: 20060181278
    Abstract: A magnetic resonance imaging apparatus includes a phased array coil including a plurality of local coils, a pre-scanning unit which pre-scans, before image scanning, an area including at least part of an image scanning area, a determination unit which determines whether each of the local coils is abnormal, based on signals output from the local coils during pre-scanning, and an information supply unit which supplies a user with information indicating an abnormal local coil, if the determination unit determines that the local coils include the abnormal local coil.
    Type: Application
    Filed: February 14, 2006
    Publication date: August 17, 2006
    Applicants: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Seiji Nozaki
  • Publication number: 20050270025
    Abstract: A magnetic resonance imaging apparatus 20 includes a phase difference calculation unit 44 configured to perform a one-dimensional Fourier transform on complex data not phase-encoded extracted from complex data of a nuclear resonant signal collected by dynamic scanning, and determining a phase difference in time of data obtained by performing a one-dimensional Fourier transform on the complex data not phase-encoded, and a correction unit 50, 51 configured, to correct for a non-uniformity of static magnetic field caused during the dynamic scanning, depending upon the phase difference.
    Type: Application
    Filed: March 23, 2005
    Publication date: December 8, 2005
    Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Seiji Nozaki, Yoshimori Kassai
  • Patent number: 6567685
    Abstract: A magnetic resonance imaging apparatus generates an MR signal from an object by applying a gradient field pulse generated by a gradient field coil and a high-frequency magnetic field pulse generated by a high-frequency coil to the object in a static field, and reconstructs an image on the basis of the MR signal. The gradient field coil is housed in a sealed vessel. The internal air in the sealed vessel is exhausted by the pump to prevent noise. By controlling the operation of the pump using a control circuit, noise in imaging operation can be reduced more effectively.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: May 20, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiromitsu Takamori, Ayumi Katsunuma, Hitoshi Kanazawa, Takeshiro Suzuki, Seiji Nozaki, Masatoshi Hanawa, Yoshio Machida, Masaaki Yamanaka, Masao Yui