Patents by Inventor Takafumi Ohishi

Takafumi Ohishi 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).

  • Patent number: 11921175
    Abstract: According to one embodiment, an arrayed structure includes a cylindrical-shaped conductor layer and a cylindrical-shaped layer stack. The cylindrical-shaped layer stack is arranged on an inner periphery of the conductor layer and a plurality of frequency selective surfaces are arranged in layers and stacked. Each of the frequency selective surfaces has a plurality of elements which are periodically arranged. Each element of the plurality of elements is formed in such a manner that at least a portion of an edge of a first element that faces an adjacent element in the same layer is closer to a center of the first element than another portion of edge.
    Type: Grant
    Filed: April 8, 2022
    Date of Patent: March 5, 2024
    Assignee: Canon Medical Systems Corporation
    Inventors: Takafumi Ohishi, Sadanori Tomiha
  • Publication number: 20240012076
    Abstract: In one embodiment, a receiving coil includes a plurality of coil elements, wherein: at least one of the coil elements includes a loop coil and a modified dipole disposed inside the loop coil; and the modified dipole includes a main dipole configured to receive a radio-frequency “RF” signal and output a reception signal and a parasitic element that includes a split ring having a gap in part of a ring shape.
    Type: Application
    Filed: July 5, 2023
    Publication date: January 11, 2024
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi OHISHI, Sadanori TOMIHA
  • Publication number: 20230314537
    Abstract: In one embodiment, a receiving coil includes at least one coil element that can simultaneously receive a plurality of magnetic resonance signals having different frequencies, wherein a resonance structure for the different frequencies is provided in a single plane in each of the at least one coil element.
    Type: Application
    Filed: March 28, 2023
    Publication date: October 5, 2023
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi OHISHI, Sadanori TOMIHA
  • Patent number: 11519985
    Abstract: In one embodiment, a Magnetic Resonance Imaging (MRI) apparatus includes: an RF coil configured to perform A/D conversion on a magnetic resonance (MR) signal received from an object and wirelessly transmit the MR signal; a main body configured to wirelessly receive the MR signal and generate a system clock; first communication circuitry configured to transmit the system clock by surface electric field communication using electric field propagation along a body surface of the object; and second communication circuitry provided in the RF coil and configured to receive the system clock transmitted by the surface electric field communication, wherein the RF coil is configured to operate based on the received system clock.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: December 6, 2022
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi Ohishi, Sadanori Tomiha
  • Publication number: 20220349967
    Abstract: According to one embodiment, an arrayed structure includes a cylindrical-shaped conductor layer and a cylindrical-shaped layer stack. The cylindrical-shaped layer stack is arranged on an inner periphery of the conductor layer and a plurality of frequency selective surfaces are arranged in layers and stacked. Each of the frequency selective surfaces has a plurality of elements which are periodically arranged. Each element of the plurality of elements is formed in such a manner that at least a portion of an edge of a first element that faces an adjacent element in the same layer is closer to a center of the first element than another portion of edge.
    Type: Application
    Filed: April 8, 2022
    Publication date: November 3, 2022
    Applicant: Canon Medical Systems Corporation
    Inventors: Takafumi OHISHI, Sadanori TOMIHA
  • Patent number: 11467236
    Abstract: In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being configured to be disposed close to an abject; a signal generator configured to generate a high-frequency signal; a coupling-amount detection circuit configured to detect coupling amount of near-field coupling due to an electric field between the object and the at least one antenna by using the high-frequency signal; and a displacement detection circuit configured to detect a physical displacement of the object based on change in the coupling amount of near-field coupling.
    Type: Grant
    Filed: March 10, 2020
    Date of Patent: October 11, 2022
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi Ohishi, Sadanori Tomiha
  • Publication number: 20220301705
    Abstract: In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being disposed close to an object; a signal generator configured to generate a radio-frequency (RF) signal; and a displacement detection circuit configured to detect a physical displacement of the object based on the RF signal, wherein the at least one antenna includes: a dipole antenna having a feeding point to be supplied with the RF signal, the feeding point being positioned in a center of the dipole antenna; a coaxial line configured to supply the RF signal to the feeding point; and a conductor element that has a ¼ wavelength and is short-circuited on one end to an outer conductor of the coaxial line.
    Type: Application
    Filed: March 14, 2022
    Publication date: September 22, 2022
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi OHISHI, Sadanori TOMIHA
  • 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: 20220183630
    Abstract: A subject information acquisition apparatus, comprises: a signal generation unit configured to generate a high-frequency signal corresponding to each of the frequencies; an acquisition unit configured to acquire a plurality of detection signals based on at least one of a reflection signal and a transmission signal; a signal selection unit configured to select at least one detection signal from the plurality of detection signals based on an index value of the plurality of detection signals; a coupling amount detecting unit configured to detect a coupling amount of near-field coupling due to an electric field between the antenna and the subject based on a detection signal; and a displacement detecting unit configured to generate a displacement signal indicating a displacement of the subject based on the coupling amount.
    Type: Application
    Filed: December 7, 2021
    Publication date: June 16, 2022
    Inventors: Ryuichi Nanaumi, Kazuya Okamoto, Takafumi Ohishi
  • Patent number: 11327129
    Abstract: In one embodiment, an MRI apparatus includes: an RF coil configured to receive a magnetic resonance signal from an object and include a first wireless antenna with horizontal polarization; a main body provided with a bore and configured to apply an RF pulse to an object, the bore being a space in which the object is placed during imaging; and at least one second wireless antenna configured to perform wireless communication between the RF coil and the main body via the first wireless antenna, one of the at least one second wireless antenna being disposed at an uppermost portion in an outer periphery of an opening edge of the bore.
    Type: Grant
    Filed: April 21, 2020
    Date of Patent: May 10, 2022
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi Ohishi, Sadanori Tomiha
  • Publication number: 20210298629
    Abstract: In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being disposed close to an object; a signal generator configured to generate a high-frequency signal; and a displacement detection circuit configured to detect a physical displacement of the object based on the high-frequency signal, wherein the at least one antenna includes: a main antenna to be supplied with the high frequency signal; and a parasitic element to which the high frequency signal is not supplied.
    Type: Application
    Filed: March 25, 2021
    Publication date: September 30, 2021
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi OHISHI, Sadanori TOMIHA
  • Patent number: 11022668
    Abstract: A magnetic resonance imaging apparatus according to the present embodiment includes processing circuitry and imaging control circuitry. The processing circuitry selects a human body model corresponding to a subject from human body models. The processing circuitry estimates local specific absorption rates (SARs) at evaluation points determined using the selected human body model, based on the selected human body model and an amplitude and/or phase of the RF pulse in an imaging protocol for magnetic resonance imaging scheduled to be performed on the subject. The processing circuitry determines whether or not the estimated local SARs fall below a local reference value. The imaging control circuitry executes the imaging protocol by using an amplitude and phase of the RF pulse which make the local SARs fall below the local reference value.
    Type: Grant
    Filed: September 17, 2018
    Date of Patent: June 1, 2021
    Assignee: Canon Medical Systems Corporation
    Inventor: Takafumi Ohishi
  • 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: 20200341083
    Abstract: In one embodiment, an MRI apparatus includes: an RF coil configured to receive a magnetic resonance signal from an object and include a first wireless antenna with horizontal polarization; a main body provided with a bore and configured to apply an RF pulse to an object, the bore being a space in which the object is placed during imaging; and at least one second wireless antenna configured to perform wireless communication between the RF coil and the main body via the first wireless antenna, one of the at least one second wireless antenna being disposed at an uppermost portion in an outer periphery of an opening edge of the bore.
    Type: Application
    Filed: April 21, 2020
    Publication date: October 29, 2020
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi Ohishi, Sadanori Tomiha
  • Publication number: 20200292650
    Abstract: In one embodiment, a Magnetic Resonance Imaging (MRI) apparatus includes: an RF coil configured to perform A/D conversion on a magnetic resonance (MR) signal received from an object and wirelessly transmit the MR signal; a main body configured to wirelessly receive the MR signal and generate a system clock; first communication circuitry configured to transmit the system clock by surface electric field communication using electric field propagation along a body surface of the object; and second communication circuitry provided in the RF coil and configured to receive the system clock transmitted by the surface electric field communication, wherein the RF coil is configured to operate based on the received system clock.
    Type: Application
    Filed: March 10, 2020
    Publication date: September 17, 2020
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi OHISHI, Sadanori TOMIHA
  • Publication number: 20200294658
    Abstract: In one embodiment, a biological information monitoring apparatus includes: an antenna assembly including at least one antenna, the antenna assembly being configured to be disposed close to an abject; a signal generator configured to generate a high-frequency signal; a coupling-amount detection circuit configured to detect coupling amount of near-field coupling due to an electric field between the object and the at least one antenna by using the high-frequency signal; and a displacement detection circuit configured to detect a physical displacement of the object based on change in the coupling amount of near-field coupling.
    Type: Application
    Filed: March 10, 2020
    Publication date: September 17, 2020
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Takafumi OHISHI, Sadanori Tomiha
  • Patent number: 10542129
    Abstract: According to one embodiment, a wireless communication device includes a first surface, a power storage unit, an antenna board, a circuit board, a wireless communication unit and a signal line. The power storage unit has a second surface located oppositely to the first surface. The antenna board implemented with an antenna faces the first surface. The circuit board faces the second surface of the power storage unit. The wireless communication unit is implemented to the circuit board and is located oppositely to a surface facing the power storage. The signal line connects the antenna board and the wireless communication unit.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: January 21, 2020
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Takafumi Ohishi
  • Patent number: 10505260
    Abstract: An antenna device includes a finite ground plane that includes a linear side, a first conductor plate that faces the finite ground plane and includes a side corresponding to the side of the finite ground plane and having a length of substantially a ? wavelength or less, and a conductor line that includes one end connected to the side of the first conductor plate and the other end short-circuited to one end portion of the side of the finite ground plane. The antenna device further includes a second conductor plate that faces the finite ground plane, includes a side corresponding to the side of the finite ground plane and having a length of substantially a ? wavelength or less, and is arranged to be adjacent to the first conductor plate to perform capacitive coupling with the first conductor plate and a feed line that includes one end connected to the side of the second conductor plate and the other end connected to the other end portion of the side of the finite ground plane.
    Type: Grant
    Filed: September 9, 2016
    Date of Patent: December 10, 2019
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuhiro Inoue, Takafumi Ohishi, Makoto Higaki
  • Publication number: 20190141173
    Abstract: According to one embodiment, a wireless communication device includes a first surface, a power storage unit, an antenna board, a circuit board, a wireless communication unit and a signal line. The power storage unit has a second surface located oppositely to the first surface. The antenna board implemented with an antenna faces the first surface. The circuit board faces the second surface of the power storage unit. The wireless communication unit is implemented to the circuit board and is located oppositely to a surface facing the power storage. The signal line connects the antenna board and the wireless communication unit.
    Type: Application
    Filed: March 8, 2018
    Publication date: May 9, 2019
    Applicant: Kabushiki Kaisha Toshiba
    Inventor: Takafumi Ohishi
  • Publication number: 20190086499
    Abstract: A magnetic resonance imaging apparatus according to the present embodiment includes processing circuitry and imaging control circuitry. The processing circuitry selects a human body model corresponding to a subject from human body models. The processing circuitry estimates local specific absorption rates (SARs) at evaluation points determined using the selected human body model, based on the selected human body model and an amplitude and/or phase of the RF pulse in an imaging protocol for magnetic resonance imaging scheduled to be performed on the subject. The processing circuitry determines whether or not the estimated local SARs fall below a local reference value. The imaging control circuitry executes the imaging protocol by using an amplitude and phase of the RF pulse which make the local SARs fall below the local reference value.
    Type: Application
    Filed: September 17, 2018
    Publication date: March 21, 2019
    Applicant: Canon Medical Systems Corporation
    Inventor: Takafumi OHISHI