Patents by Inventor Yoshihisa Soutome

Yoshihisa Soutome 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: 10330752
    Abstract: In order to improve B1 non-homogeneity while reducing a local SAR in an object, particularly, in a human tissue during MR imaging, the present invention is characterized in that each of a plurality of irradiation channels is controlled on the basis of RF shimming parameters corresponding to the plurality of irradiation channels, and, in a case of performing imaging sequence of irradiating an object with an RF magnetic field, there is the use of the RF shimming parameters obtained by imposing a constraint condition on at least one of a plurality of principal components obtained through principal component analysis on the RF shimming parameters.
    Type: Grant
    Filed: February 15, 2016
    Date of Patent: June 25, 2019
    Assignee: HITACHI, LTD.
    Inventors: Kosuke Ito, Yoshihisa Soutome, Masahiro Takizawa
  • Patent number: 10267879
    Abstract: A technique in a medical imaging apparatus being capable of setting any plane in three-dimensional space as an imaging slice is provided, allowing an automatically-set imaging slice to be configured to suit user's preferences, and determine a position of the imaging slice being configured, with respect to an imaging target subject automatically with a high degree of accuracy. Reference information for specifying the imaging slice, set by the user for each imaging site, is associated with the anatomical feature of the imaging site, so as to generate an imaging slice parameter. Upon actual imaging, the imaging slice parameter and the anatomical feature of the imaging target subject obtained by scout imaging are used to determine the imaging slice position of the imaging target subject.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: April 23, 2019
    Assignee: HITACHI, LTD.
    Inventors: Suguru Yokosawa, Yo Taniguchi, Yoshitaka Bito, Yoshihisa Soutome
  • Patent number: 10241161
    Abstract: Provided is a technique capable of achieving safety and image quality at the same time in an MRI device using a transmission coil including plural channels. An SAR distribution is calculated, and an imaging parameter is determined for optimizing a radio frequency magnetic field distribution in an imaging region while suppressing a maximum value of an SAR to be equal to or smaller than a predetermined threshold value. The determined imaging parameter includes a radio frequency magnetic field parameter for specifying radio frequency pulses to be transmitted through each of the plural channels. The SAR distribution is calculated using a database that retains an electric field distribution of each of the plural channels for each subject model retained in advance.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: March 26, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Yukio Kaneko, Yoshihisa Soutome, Hisaaki Ochi
  • Patent number: 10156615
    Abstract: Provided is a technique that enables accurate SAR management using power consumption by an object (Pobject) that was calculated based on accurately acquired Q-factors. For this purpose, the present invention calculates Q-factors of each channel of a high-frequency antenna using measurement results of amplitudes of forward waves and reflected waves of each high-frequency signal between three or more different frequencies. An existing SAR monitor in an MRI apparatus is used for the amplitude measurement. Also, the Q-factors are calculated based on a circuit coefficient to be acquired by fitting the measurement results to a predetermined circuit model. Then, the power consumption by an object (Pobject) is calculated using the calculated Q-factors in order to manage the SAR.
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: December 18, 2018
    Assignee: HITACHI, LTD.
    Inventors: Hideta Habara, Yoshihisa Soutome, Masahiro Takizawa, Yoshiaki Sato
  • Patent number: 10132899
    Abstract: A magnetic resonance imaging apparatus comprising a measurement parameter-setting unit for setting measurement parameters that determine the strength and timing of the high frequency magnetic field and the gradient magnetic field, and a measuring unit for applying the high frequency magnetic field and the gradient magnetic field on a subject placed in the static magnetic field according to the measurement parameters and detecting the nuclear magnetic resonance signal generated from the subject as a complex signal. The measurement parameter-setting unit is equipped with: a basic parameter-inputting section for setting the imaging parameters and imaging cross-section; a limiting condition-inputting section for setting limiting conditions that apply limits on the setting of the voxel size; a voxel size-calculating section for setting the voxel size according to the limiting conditions; and a voxel size-displaying section for displaying the set voxel size to the user.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: November 20, 2018
    Assignee: HITACHI, LTD.
    Inventors: Ryota Sato, Toru Shirai, Yo Taniguchi, Yoshihisa Soutome, Yoshitaka Bito
  • Patent number: 10107878
    Abstract: Provided is an antenna such as a TEM-type antenna and a microstrip-type antenna that has rung conductors and a shield conductor to electrically connect and use them. A holding member that maintains a shape of the shield conductor is composed by assembling ribs and thin walls. An inner holding member is a structural material. Holes are provided on at least either one of the shield conductor and the holding member adhered thereto or the inner holding member, which can adjoin conductors from the outside of the cylindrical antenna through the said holes during the antenna production.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: October 23, 2018
    Assignee: HITACHI, LTD.
    Inventors: Hideta Habara, Yoshihisa Soutome, Yosuke Otake, Shinichiro Suzuki
  • Publication number: 20180085026
    Abstract: When an electrical characteristic of a predetermined region of a subject placed in a static magnetic field space is measured by using magnetic resonance signals measured from the region, measurement data measured by coinciding direction of a tissue structure of the subject with the direction of the static magnetic field, and measurement data measured with a direction of the tissue structure of the subject crossing the direction of the static magnetic field are used. A rotating magnetic field map of the region is created from the measurement data, and the electrical characteristic is calculated by using the rotating magnetic field map. The electrical characteristic is calculated as an electrical characteristic including anisotropy by using information about the direction of tissue structure.
    Type: Application
    Filed: September 12, 2017
    Publication date: March 29, 2018
    Inventors: Yukio KANEKO, Hisaaki OCHI, Yoshihisa SOUTOME
  • Publication number: 20180045798
    Abstract: A technique in a medical imaging apparatus being capable of setting any plane in three-dimensional space as an imaging slice is provided, allowing an automatically-set imaging slice to be configured to suit user's preferences, and determine a position of the imaging slice being configured, with respect to an imaging target subject automatically with a high degree of accuracy. Reference information for specifying the imaging slice, set by the user for each imaging site, is associated with the anatomical feature of the imaging site, so as to generate an imaging slice parameter. Upon actual imaging, the imaging slice parameter and the anatomical feature of the imaging target subject obtained by scout imaging are used to determine the imaging slice position of the imaging target subject.
    Type: Application
    Filed: October 12, 2017
    Publication date: February 15, 2018
    Applicant: HITACHI, LTD.
    Inventors: Suguru Yokosawa, Yo Taniguchi, Yoshitaka Bito, Yoshihisa Soutome
  • Publication number: 20180028273
    Abstract: There is provided an MRI apparatus in which, when a quantitative value, which does not depend on imaging parameter values, is computed from a plurality of image data having different pixel values that are acquired by performing imaging the plurality of times with different imaging parameter values in the same pulse sequence, pixel values which are acquired from the imaging parameter values are predicted for each of a plurality of predetermined quantitative-value candidate group, and an initial value of the quantitative value is selected from the quantitative-value candidate groups with reference to the predicted pixel values. The optimal quantitative value is computed through a localized optimization technique using the selected initial value.
    Type: Application
    Filed: June 6, 2017
    Publication date: February 1, 2018
    Inventors: Suguru YOKOSAWA, Yo TANIGUCHI, Hisaaki OCHI, Tomoki AMEMIYA, Yoshihisa SOUTOME
  • Publication number: 20180011155
    Abstract: In order to improve B1 non-homogeneity while reducing a local SAR in an object, particularly, in a human tissue during MR imaging, the present invention is characterized in that each of a plurality of irradiation channels is controlled on the basis of RF shimming parameters corresponding to the plurality of irradiation channels, and, in a case of performing imaging sequence of irradiating an object with an RF magnetic field, there is the use of the RF shimming parameters obtained by imposing a constraint condition on at least one of a plurality of principal components obtained through principal component analysis on the RF shimming parameters.
    Type: Application
    Filed: February 15, 2016
    Publication date: January 11, 2018
    Inventors: Kosuke ITO, Yoshihisa SOUTOME, Masahiro TAKIZAWA
  • Patent number: 9851424
    Abstract: There is provided a technique for obtaining temperature information for inside of a living body and accuracy information thereof in short time with low burden imposed on a subject. It is realized with a spectrum calculator configured to perform MRS or MRSI measurement for two kinds of substances showing difference of resonant frequencies and calculating spectra of magnetic resonance signals of the two kinds of substances, a temperature information calculator configured to calculate temperature information for inside of the subject on the basis of peaks of the calculated spectra, a temperature accuracy information calculator configured to calculate temperature accuracy information indicating accuracy of the temperature information on the basis of peaks of the calculated spectra, and a display information generator configured to generate display information to be displayed on a display device on the basis of the temperature information and the temperature accuracy information.
    Type: Grant
    Filed: January 10, 2013
    Date of Patent: December 26, 2017
    Assignee: HITACHI, LTD.
    Inventors: Toru Shirai, Yoshitaka Bito, Yo Taniguchi, Satoshi Hirata, Yoshihisa Soutome, Tetsuhiko Takahashi, Hiroyuki Itagaki
  • Patent number: 9766316
    Abstract: The estimation accuracy of a magnetic susceptibility value of tissue is improved by computing an edge image which represents the edge of the tissue on a magnetic susceptibility distribution and to reduce background noise without lowering the magnetic susceptibility value of the tissue. The present invention computes an absolute value image and a phase image from a complex image obtained by MRI, from the phase image, computes a low frequency region magnetic susceptibility image in which background noise is greater than a desired value, computes an edge information magnetic susceptibility image and computes a high frequency region magnetic susceptibility image, computes an edge mask from the edge information magnetic susceptibility image, smooths a magic angle region from the edge mask and the low frequency region magnetic susceptibility image and finally smooths a high frequency region using the high frequency region magnetic susceptibility image.
    Type: Grant
    Filed: November 16, 2012
    Date of Patent: September 19, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Ryota Sato, Toru Shirai, Yo Taniguchi, Yoshihisa Soutome, Yoshitaka Bito
  • Patent number: 9726744
    Abstract: Systems and methods for magnetic resonance imaging, including adjusting spatial distribution of a rotating magnetic field. By minimizing imaging time, the B1 nonuniformity reducing effect of RF shimming is maximized for an imaging section of an arbitrary axis direction and an arbitrary position. B1 distributions are measured for only several sections of one predetermined direction, and a radio frequency magnetic field condition that maximizes the B1 non-uniformity reducing effect for an imaging section of an arbitrary direction and an arbitrary position is calculated from the B1 distribution data.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: August 8, 2017
    Assignee: HITACHI, LTD.
    Inventors: Yukio Kaneko, Yoshihisa Soutome, Yoshitaka Bito, Hiroyuki Takeuchi, Tetsuhiko Takahashi, Hideta Habara, Yosuke Otake
  • Patent number: 9684044
    Abstract: In order to provide a technique which can suppress coupling to homogenize the spatial distribution of an RF magnetic field and can improve penetration of the RF magnetic field into the subject, pad-like electric field conductors having a predetermined area are provided outside both ends of a rung conductor as a part of a configuration which forms a loop-like circuit and is driven as an antenna. An antenna device includes a sheet-like conductor, a rung conductor which is arranged at a predetermined distance from the sheet-like conductor, two electric field conductors which are arranged in both end portions of the rung conductor at a predetermined distance from the sheet-like conductor, and connection terminals which are transmission and reception terminals provided in the rung conductor and the sheet-like conductor. The rung conductor and the sheet-like conductor configure a loop circuit which resonates at a preset frequency.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: June 20, 2017
    Assignee: HITACHI, LTD.
    Inventors: Hideta Habara, Yoshihisa Soutome, Hiroyuki Takeuchi, Hisaaki Ochi
  • Patent number: 9678187
    Abstract: An object of the present invention is to suppress artifacts generated by correction of spectral distortion induced by eddy currents in MRI devices with a simple method, and thereby improve accuracy of the correction.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: June 13, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Toru Shirai, Yoshitaka Bito, Satoshi Hirata, Yoshihisa Soutome
  • Patent number: 9664756
    Abstract: A lower cost MRI device with a portable table detachable from the gantry is provided along with a lower cost table equipped with an easy-to-use and easy-to-install RF coil system able to perform high-resolution head and neck imaging and high-speed whole body imaging in both head-first and feet-first modes. This magnetic resonance imaging device has a portable table detachable from the gantry, and the portable table has a docking connector that can be connected to the gantry and a ceiling panel on which an RF coil can be installed to receive nuclear magnetic resonance signals generated by the examinee and to irradiate the examinee with a high-frequency magnetic field. The RF coil is divided into two or more RF coil units, the ceiling panel has a plurality of ceiling panel connectors enabling each RF coil unit to be connected, and each RF coil unit has a connector.
    Type: Grant
    Filed: December 20, 2012
    Date of Patent: May 30, 2017
    Assignee: HITACHI, LTD.
    Inventors: Masayoshi Dohata, Yoshihisa Soutome
  • Publication number: 20170146620
    Abstract: Provided is a technique that enables accurate SAR management using power consumption by an object (Pobject) that was calculated based on accurately acquired Q-factors. For this purpose, the present invention calculates Q-factors of each channel of a high-frequency antenna using measurement results of amplitudes of forward waves and reflected waves of each high-frequency signal between three or more different frequencies. An existing SAR monitor in an MRI apparatus is used for the amplitude measurement. Also, the Q-factors are calculated based on a circuit coefficient to be acquired by fitting the measurement results to a predetermined circuit model. Then, the power consumption by an object (Pobject) is calculated using the calculated Q-factors in order to manage the SAR.
    Type: Application
    Filed: June 23, 2015
    Publication date: May 25, 2017
    Inventors: Hideta HABARA, Yoshihisa SOUTOME, Masahiro TAKIZAWA, Yoshiaki SATO
  • Patent number: 9638771
    Abstract: A technique is provided to reserve large examination space in the tunnel type MRI apparatus, without increasing production cost nor reducing significantly irradiation efficiency and homogeneity in an irradiation distribution within an imaging region. The present invention provides an RF coil unit in which four partial cylindrical coils are placed with a gap therebetween in the circumferential direction inside a cylindrical RF shield, in such a manner that two pairs of the partial cylindrical coils are opposed to each other, and magnetic fields produced by the individual partial cylindrical coils are combined, thereby producing a circularly polarized wave field or an elliptically polarized wave field.
    Type: Grant
    Filed: July 25, 2011
    Date of Patent: May 2, 2017
    Assignee: HITACHI, LTD.
    Inventors: Yoshihisa Soutome, Yoshitaka Bito, Hiroyuki Takeuchi, Tetsuhiko Takahashi, Hisaaki Ochi, Hideta Habara
  • Patent number: 9599685
    Abstract: There is provided a technique for suppressing increase of SAR without sacrificing sensitivity in RF coils used in MRI apparatuses. The present invention provides an antenna device comprising a sheet-shaped conductor and a ribbon-shaped conductor disposed on the subject side with respect to the sheet-shaped conductor with a predetermined distance from the sheet-shaped conductor. The ribbon-shaped conductor has a meandering shape, and is adjusted so as to resonate at transmission and reception frequencies, and it is constituted so that distance to the sheet-shaped conductor becomes smaller at both end part thereof along the static magnetic field direction compared with the distance to the sheet-shaped conductor at the center thereof. Moreover, the ribbon-shaped conductor is constituted so as to have a smaller width, as the distance to the sheet-shaped conductor becomes smaller.
    Type: Grant
    Filed: October 6, 2011
    Date of Patent: March 21, 2017
    Assignee: HITACHI, LTD.
    Inventors: Hideta Habara, Yoshitaka Bito, Hisaaki Ochi, Yoshihisa Soutome, Masayoshi Dohata, Tetsuhiko Takahashi, Hiroyuki Takeuchi
  • Patent number: 9541614
    Abstract: The present invention is directed to an elliptical birdcage coil which reduces time and effort upon manufacturing and production cost, with less variations in performance. There is provided a high frequency coil unit made up of the elliptical birdcage coil having plural capacitors arranged at least on either of the ring conductors and the rung conductors, the capacitance of the plural capacitors being uniform with respect to each conductor type on which the capacitors are placed. In this elliptical birdcage coil, a value of inductance and arrangement of the ring conductors and the rung conductors are determined in such a manner that the capacitance of the capacitors becomes identical with respect to each conductor type on which the capacitors are arranged.
    Type: Grant
    Filed: April 6, 2012
    Date of Patent: January 10, 2017
    Assignee: HITACHI, LTD.
    Inventors: Yoshihisa Soutome, Yoshitaka Bito, Hideta Habara