Patents by Inventor Sho KAWAJIRI

Sho KAWAJIRI 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: 20220270283
    Abstract: A magnetic resonance imaging device according to an embodiment includes a processing circuitry. The processing circuitry obtains, from an image of a test subject taken by an optical photographing device, image-related information regarding at least either the test subject or a radio frequency (RF) coil attached to the test subject. Then, the processing circuitry selects statistical information about the attachment position of the RF coil based on the image-related information. Subsequently, the processing circuitry outputs the attachment position of the RF coil corresponding to the statistical information.
    Type: Application
    Filed: February 10, 2022
    Publication date: August 25, 2022
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Fumiyasu OTAKE, Sho KAWAJIRI
  • Publication number: 20220260656
    Abstract: An image processing apparatus according to an embodiment includes a processing circuitry. The processing circuitry is configured to acquires an image by capturing a subject laid on a table of a magnetic-resonance imaging apparatus with a camera, detects a loop having a possibility of generating an induced current by a magnetic field that is generated by the magnetic-resonance imaging apparatus from the image, and outputs a detection result.
    Type: Application
    Filed: February 7, 2022
    Publication date: August 18, 2022
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Hiroyuki HATAKENAKA, Sho KAWAJIRI
  • Publication number: 20220229127
    Abstract: In one embodiment, an image processing apparatus includes processing circuitry. The processing circuitry acquires an image in which a coil is depicted. The processing circuitry acquires, from the image, information on disposition of the coil and information on a port to which the coil is connected.
    Type: Application
    Filed: January 14, 2022
    Publication date: July 21, 2022
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventor: Sho KAWAJIRI
  • Patent number: 11372062
    Abstract: According to one embodiment, a coil element includes an extendable and contractible coil and a capacitor. The capacitor is connected to the coil and has an electrostatic capacity which changes due to a physical change in response to extension or contraction of the coil.
    Type: Grant
    Filed: October 14, 2020
    Date of Patent: June 28, 2022
    Assignee: Canon Medical Systems Corporation
    Inventors: Sadanori Tomiha, Takafumi Ohishi, Sho Kawajiri, Satoshi Imai
  • Publication number: 20210393131
    Abstract: A apparatus according to an embodiment includes a processing circuitry. The processing circuitry is configured to detect whether a mobile terminal is placed at a certain position that is located outside an entrance of a room in which a magnetic resonance imaging apparatus is installed. The processing circuitry is configured to execute unlock a door of the entrance, or output information related to permission for entry into the room through the entrance, in a case in which it is detected that the mobile terminal is placed at the certain position.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 23, 2021
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventor: Sho KAWAJIRI
  • Publication number: 20210393223
    Abstract: A medical image diagnosis system according to an embodiment includes a sensor and a processing circuitry. The sensor is configured to detect whether or not a mobile terminal is mounted on a mount base capable of having the mobile terminal mounted thereon. The processing circuitry is configured, when it is detected that the mobile terminal is mounted on the mount base, to exercise control over a medical image diagnosis apparatus.
    Type: Application
    Filed: June 9, 2021
    Publication date: December 23, 2021
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventor: Sho KAWAJIRI
  • Patent number: 11105872
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an amplifier, a gradient coil, and adjusting circuitry. The amplifier includes pulse width modulation circuitry modulating a pulse width of a driving signal, which is input to switching elements, in accordance with an input of a control signal corresponding to a waveform of a gradient magnetic field. The gradient coil generates the gradient magnetic field by an electric current supplied in accordance with an output voltage which is output from the amplifier. The adjusting circuitry executes adjustment of a gain of the amplifier, which is included in the control signal, or adjustment of the pulse width of the driving signal, in accordance with a dead time included in a switching cycle of the switching elements.
    Type: Grant
    Filed: June 18, 2018
    Date of Patent: August 31, 2021
    Assignee: Canon Medical Systems Corporation
    Inventors: Sho Kawajiri, Motohiro Miura, Masashi Hori, Takahiro Kobayashi
  • Publication number: 20210132165
    Abstract: According to one embodiment, a coil element includes an extendable and contractible coil and a capacitor. The capacitor is connected to the coil and has an electrostatic capacity which changes due to a physical change in response to extension or contraction of the coil.
    Type: Application
    Filed: October 14, 2020
    Publication date: May 6, 2021
    Applicant: Canon Medical Systems Corporation
    Inventors: Sadanori TOMIHA, Takafumi OHISHI, Sho KAWAJIRI, Satoshi IMAI
  • Publication number: 20210121092
    Abstract: A magnetic resonance imaging system according to an embodiment includes a magnetic resonance imaging device including a couch with a couchtop on which a subject is placed, and an optical photographing device. The optical photographing device acquires an image including the couch. The magnetic resonance imaging device includes a processing circuitry that performs display of information expressing a position of a first RF coil disposed under or inside the couchtop on the basis of the image acquired by the optical photographing device so that a positional relation with the subject placed on the couchtop is displayed.
    Type: Application
    Filed: October 16, 2020
    Publication date: April 29, 2021
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Sho KAWAJIRI, Masashi HORI
  • Patent number: 10989775
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes amplifiers, processing circuitry, and a power supplier. The amplifiers supplies power for each of a plurality of channels of gradient coils. The processing circuitry obtains, for each of the channels, a voltage gradient that represents a temporal change of a power supply voltage for supplying a current to the amplifiers. The power supplier supplies the power to an amplifier corresponding to a specific one of the channels on a priority basis in accordance with the voltage gradient.
    Type: Grant
    Filed: November 7, 2018
    Date of Patent: April 27, 2021
    Assignee: Canon Medical Systems Corporation
    Inventors: Sho Kawajiri, Motohiro Miura, Masashi Hori
  • Patent number: 10884083
    Abstract: A gradient magnetic field power supply, connected to a first coil and a second coil for each applying a gradient magnetic field to an object, the power supply, according to an embodiment includes a first current sensor and a second current sensor. The second current sensor is provided such that a direction of a current detectable by the second current sensor crosses a direction of a current detectable by the first current sensor.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: January 5, 2021
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Sho Kawajiri, Norio Togawa, Kazuhiro Hamaya
  • Patent number: 10809329
    Abstract: A magnetic resonance imaging apparatus according to a present embodiment includes a gradient magnetic field coil and a gradient magnetic field power supply. The gradient magnetic field coil applies gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels. The gradient magnetic field power supply calculates a required power for each channel, and distributes maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: October 20, 2020
    Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Motohiro Miura, Masashi Hori, Sho Kawajiri
  • Patent number: 10459047
    Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a gradient magnetic field power supply configured to supply power to a gradient coil. The gradient magnetic field power supply includes a plurality of switching circuits and a processing circuitry. Each of the switching circuits is configured to output a predetermined pulse voltage. The processing circuitry is configured to change the number of switching circuits to be caused to perform switching operation among the switching circuits, in accordance with an intensity of the voltage to be output to the gradient coil.
    Type: Grant
    Filed: April 29, 2015
    Date of Patent: October 29, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Sho Kawajiri, Motohiro Miura
  • Patent number: 10416255
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a gradient coil, power supply circuitry, and control circuitry. The gradient coil generates a gradient magnetic field. The power supply circuitry supply power to the gradient coil, the power being required by the gradient. The control circuitry temporarily change an upper limit value of power to be supplied by the power supply circuitry to a second value higher than a first value as a rated value based on the power required by the gradient coil.
    Type: Grant
    Filed: November 23, 2016
    Date of Patent: September 17, 2019
    Assignee: Canon Medical Systems Coprporation
    Inventors: Sho Kawajiri, Naoyuki Furudate, Yutaka Machii
  • Patent number: 10408899
    Abstract: A magnetic resonance imaging apparatus according to a present embodiment includes a gradient magnetic field coil and a gradient magnetic field power supply. The gradient magnetic field coil applies gradient magnetic field to an object, the gradient magnetic field coil including a plurality of channels. The gradient magnetic field power supply calculates a required power for each channel, and distributes maximum power to a channel requiring higher power than the required power of other channels with priority to the other channels, the maximum power being a limit value of total power to be supplied to the channels as a whole.
    Type: Grant
    Filed: December 1, 2016
    Date of Patent: September 10, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Motohiro Miura, Masashi Hori, Sho Kawajiri
  • Patent number: 10401449
    Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a processing circuit and a sequence control circuit. The processing circuit calculates, based on an imaging sequence to be executed in magnetic resonance imaging, a value of a current flowing through a closed circuit by using an equivalent circuit and determines, prior to an execution of the imaging sequence, based on the value of the current, whether it is acceptable to execute the imaging sequence. The sequence control circuit executes the imaging sequence. The equivalent circuit is an equivalent circuit for a circuit that includes a gradient coil and that has a first circuit and a second circuit. The first circuit is connected to a power supply and has self-inductance. The second circuit includes at least one closed circuit having mutual inductance with the first circuit.
    Type: Grant
    Filed: July 28, 2016
    Date of Patent: September 3, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Yutaka Machii, Naoyuki Furudate, Sho Kawajiri, Motohiro Miura
  • Patent number: 10371772
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a gradient magnetic field power supply, a voltmeter, and processing circuitry. The gradient magnetic field power supply includes an amplifier amplifying an input signal based on information of a gradient magnetic field waveform and outputting the amplified input signal to a gradient coil, a power supply device supplying power to the amplifier, and a capacitor bank supplying power, together with the power supply device, to the amplifier. The voltmeter measures a voltage of the capacitor bank. The processing circuitry calculates frequency characteristics of an impedance of the gradient coil, based on a voltage variation of the capacitor bank which was measured by the voltmeter, and controls imaging in accordance with the calculated frequency characteristics.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: August 6, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Sho Kawajiri, Motohiro Miura, Naoyuki Furudate, Yutaka Machii
  • Publication number: 20190170841
    Abstract: A gradient magnetic field power supply, connected to a first coil and a second coil for each applying a gradient magnetic field to an object, the power supply, according to an embodiment includes a first current sensor and a second current sensor. The second current sensor is provided such that a direction of a current detectable by the second current sensor crosses a direction of a current detectable by the first current sensor.
    Type: Application
    Filed: December 3, 2018
    Publication date: June 6, 2019
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Sho KAWAJIRI, Norio Togawa, Kazuhiro Hamaya
  • Publication number: 20190137581
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes amplifiers, processing circuitry, and a power supplier. The amplifiers supplies power for each of a plurality of channels of gradient coils. The processing circuitry obtains, for each of the channels, a voltage gradient that represents a temporal change of a power supply voltage for supplying a current to the amplifiers. The power supplier supplies the power to an amplifier corresponding to a specific one of the channels on a priority basis in accordance with the voltage gradient.
    Type: Application
    Filed: November 7, 2018
    Publication date: May 9, 2019
    Applicant: Canon Medical Systems Corporation
    Inventors: Sho KAWAJIRI, Motohiro MIURA, Masashi HORI
  • Publication number: 20180372820
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an amplifier, a gradient coil, and adjusting circuitry. The amplifier includes pulse width modulation circuitry modulating a pulse width of a driving signal, which is input to switching elements, in accordance with an input of a control signal corresponding to a waveform of a gradient magnetic field. The gradient coil generates the gradient magnetic field by an electric current supplied in accordance with an output voltage which is output from the amplifier. The adjusting circuitry executes adjustment of a gain of the amplifier, which is included in the control signal, or adjustment of the pulse width of the driving signal, in accordance with a dead time included in a switching cycle of the switching elements.
    Type: Application
    Filed: June 18, 2018
    Publication date: December 27, 2018
    Applicant: Canon Medical Systems Corporation
    Inventors: Sho KAWAJIRI, Motohiro MIURA, Masahi HORI, Takahiro KOBAYASHI