Patents by Inventor Yoshitaka Bito

Yoshitaka Bito 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: 20200286214
    Abstract: Image processing using a machine learning model is enabled, thereby accurately reducing noise to improve image quality. A medical image is acquired; and it is evaluated whether noise in the medical image exceeds a predetermined reference value. A noise reducer reduces the noise of the medical image that has been determined to include noise that exceeds the reference value. The noise of the medical image is reduced using a machine learning model constructed by collecting a plurality of learning data sets that include an image with noise as input data and an image without noise as output data. The machine learning model includes a plurality of layers that perform convolution on an image that is input, one layer of which includes a filter layer in which a plurality of linear or nonlinear filters are incorporated, and convolution coefficients of the plurality of linear or nonlinear filters are predetermined.
    Type: Application
    Filed: February 28, 2020
    Publication date: September 10, 2020
    Inventors: Yukio KANEKO, Masahiro OGINO, Yoshimi NOGUCHI, Yoshitaka BITO
  • Patent number: 10765349
    Abstract: Provided is a technique for calculating an oxygen extraction fraction by using MRI where the oxygen extraction fraction in a brain including brain parenchyma is calculated via a simple processing without an impact on an examinee, such as administration of caffeine. For this purpose, an MRI apparatus of the present invention measures a complex image of nuclear magnetic resonance signals, and calculates from thus measured complex image, a physical property distribution for obtaining a physical property image reflecting the oxygen extraction fraction. Then, thus calculated physical property distribution is separated into tissue-specific physical property distributions for at least two tissues (separated tissue images). After converting any of the separated tissue images into the oxygen extraction fraction, a distribution of the oxygen extraction fraction is estimated based on the condition that a value of any selected pixel is substantially equal to a mean value of pixels surrounding the selected pixel.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: September 8, 2020
    Assignee: HITACHI, LTD.
    Inventors: Toru Shirai, Ryota Satoh, Yo Taniguchi, Hisaaki Ochi, Yoshihisa Sotome, Yoshitaka Bito, Takenori Murase
  • Publication number: 20200260958
    Abstract: A magnetic resonance imaging apparatus includes: a static magnetic field generating magnet configured to generate a static magnetic field in a space where a subject is arranged; a transmission unit configured to transmit a high frequency magnetic field to the subject; a reception unit configured to receive a nuclear magnetic resonance signal generated in the subject due to transmission of the high-frequency magnetic field thereto; a gradient magnetic field application unit configured to apply a gradient magnetic field which adds positional information to the nuclear magnetic resonance signal; a computer configured to control the transmission unit, the reception unit, and the gradient magnetic field application unit, and configured to process the nuclear magnetic resonance signal; and a display unit configured to display an image processed by the computer; and the computer performs a predetermined calculation processing.
    Type: Application
    Filed: June 1, 2018
    Publication date: August 20, 2020
    Inventors: Toru SHIRAI, Ryota SATOH, Hisaaki OCHI, Takenori MURASE, Yoshitaka BITO
  • Patent number: 10605881
    Abstract: In calculating a local magnetic field distribution caused by a magnetic susceptibility difference between living tissues, using MRI, a local frequency distribution with a high SNR is calculated in a short computation time. Multi-echo complex images obtained by measurement of at least two different echo times using the MRI are converted into low-resolution images. A global frequency distribution caused by global magnetic field changes and an offset phase distribution including a reception phase and a transmission phase are separated from a phase distribution of the low-resolution multi-echo complex images. Thus calculated global frequency distribution and the offset phase distribution are enhanced in resolution. A local frequency distribution of each echo is calculated from the measured multi-echo complex images, the high-resolution global frequency distribution, and the high-resolution offset phase distribution.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: March 31, 2020
    Assignee: Hitachi, Ltd.
    Inventors: Toru Shirai, Ryota Satoh, Yo Taniguchi, Hisaaki Ochi, Takenori Murase, Yoshitaka Bito
  • Patent number: 10451701
    Abstract: With an MRI apparatus using a transmission coil having multiple channels, a region desired to be diagnosed is efficiently imaged with high image quality. The MRI apparatus comprises a region setting means for setting a region in an imaging region, of which high quality image is desired to be obtained, as a first region, and an optimization means for determining at least one of amplitude and phase of a radio frequency wave transmitted to each of the multiple channels as a radio frequency magnetic field condition, and the optimization means determines the radio frequency magnetic field condition so that at least one of specific absorption ratio and signal value of a region that generates artifacts is not higher than a predetermined value defined for each, under a uniformity constraint condition that uniformity of radio frequency magnetic field distribution in the first region is not lower than a predetermined value.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: October 22, 2019
    Assignee: HITACHI, LTD.
    Inventors: Yukio Kaneko, Hideta Habara, Yoshihisa Soutome, Yoshitaka Bito
  • Publication number: 20190261906
    Abstract: Provided is a technique for calculating an oxygen extraction fraction by using MRI where the oxygen extraction fraction in a brain including brain parenchyma is calculated via a simple processing without an impact on an examinee, such as administration of caffeine. For this purpose, an MRI apparatus of the present invention measures a complex image of nuclear magnetic resonance signals, and calculates from thus measured complex image, a physical property distribution for obtaining a physical property image reflecting the oxygen extraction fraction. Then, thus calculated physical property distribution is separated into tissue-specific physical property distributions for at least two tissues (separated tissue images). After converting any of the separated tissue images into the oxygen extraction fraction, a distribution of the oxygen extraction fraction is estimated based on the condition that a value of any selected pixel is substantially equal to a mean value of pixels surrounding the selected pixel.
    Type: Application
    Filed: October 11, 2017
    Publication date: August 29, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Toru SHIRAI, Ryota SATOH, Yo TANIGUCHI, Hisaaki OCHI, Yoshihisa SOTOME, Yoshitaka BITO, Takenori MURASE
  • Patent number: 10330764
    Abstract: Provided is a magnetic resonance measuring apparatus that records measurement data measured by MRS or the like and a periodic motion of the measurement object during the measurement of the measurement data in association with each other, and classifies spectra calculated from the measurement data in accordance with a time phase of the periodic motion. Created spectra are integrated for each classification to thereby create partially integrated spectra, correction based on a relationship between the periodic motion and a phase fluctuation or a frequency fluctuation is performed on the partially integrated spectra, and the corrected partially integrated spectra are synthesized.
    Type: Grant
    Filed: October 6, 2016
    Date of Patent: June 25, 2019
    Assignee: HITACHI, LTD.
    Inventor: Yoshitaka Bito
  • Publication number: 20190128991
    Abstract: In calculating a local magnetic field distribution caused by a magnetic susceptibility difference between living tissues, using MRI, a local frequency distribution with a high SNR is calculated in a short computation time. Multi-echo complex images obtained by measurement of at least two different echo times using the MRI are converted into low-resolution images. A global frequency distribution caused by global magnetic field changes and an offset phase distribution including a reception phase and a transmission phase are separated from a phase distribution of the low-resolution multi-echo complex images. Thus calculated global frequency distribution and the offset phase distribution are enhanced in resolution. A local frequency distribution of each echo is calculated from the measured multi-echo complex images, the high-resolution global frequency distribution, and the high-resolution offset phase distribution.
    Type: Application
    Filed: March 17, 2017
    Publication date: May 2, 2019
    Inventors: Toru SHIRAI, Ryota SATOH, Yo TANIGUCHI, Hisaaki OCHI, Takenori MURASE, Yoshitaka BITO
  • 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
  • Publication number: 20190076049
    Abstract: Accuracy degradation due to a signal loss is reduced, and susceptibility is calculated with high accuracy where, by using an MRI, at least one echo is acquired where spatial magnetic field inhomogeneity is reflected, and a complex image is calculated from the acquired echo. Three masks are calculated from the calculated complex image; a low-signal region mask representing a low signal region, a first high-signal region mask representing a high signal and high fat content region, and a second high-signal region mask representing a high signal and low fat content region. In calculating a susceptibility image from a frequency image or a magnetic field image generated from the complex image, the susceptibility image is obtained under the constraint that a region defined by the low-signal region is set as a background and the susceptibility of the region defined by the second high-signal region mask is set to a specific value.
    Type: Application
    Filed: May 24, 2017
    Publication date: March 14, 2019
    Inventors: Ryota SATOH, Toru SHIRAI, Yo TANIGUCHI, Yoshitaka BITO, Hisaaki OCHI, Yoshihisa SOTOME
  • Patent number: 10185017
    Abstract: The present invention provides a technique for obtaining a high-quality image at high speed in DKI analysis. In the DKI analysis, upon estimating a parameter relating to diffusion in an application direction of an MPG pulse, a least square fitting is separated from a constraint processing, and only a value of the pixel that does not meet the constraint condition in the least square fitting is targeted for the correction. Then, with regard to this pixel, a diffusion-related parameter is re-estimated using the pixel value after the correction, and a parameter image is generated by using the diffusion-related parameter thus obtained.
    Type: Grant
    Filed: July 21, 2014
    Date of Patent: January 22, 2019
    Assignee: HITACHI, LTD.
    Inventors: Suguru Yokosawa, Hisaaki Ochi, Yoshitaka Bito
  • Patent number: 10180474
    Abstract: Provided is a technique in calculating a magnetic susceptibility distribution by using an MRI, for reducing artifacts and noise and improving precision in the magnetic susceptibility distribution being calculated. According to this technique, a magnetic field distribution is obtained via a phase image from a complex image acquired through MRI. Under the constraint based on a relational expression between the magnetic field and the magnetic susceptibility, smoothing process is performed iteratively on the magnetic susceptibility distribution calculated from the magnetic field distribution. Specifically, a minimization process for minimizing through the iterative operation, an error function defined by a predetermined initial magnetic susceptibility distribution and the magnetic field distribution is performed, thereby calculating the magnetic susceptibility distribution.
    Type: Grant
    Filed: October 19, 2015
    Date of Patent: January 15, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Toru Shirai, Ryota Satoh, Yo Taniguchi, Hisaaki Ochi, Takenori Murase, Yoshitaka Bito
  • 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
  • Publication number: 20180059202
    Abstract: Provided is a magnetic resonance measuring apparatus that records measurement data measured by MRS or the like and a periodic motion of the measurement object during the measurement of the measurement data in association with each other, and classifies spectra calculated from the measurement data in accordance with a time phase of the periodic motion. Created spectra are integrated for each classification to thereby create partially integrated spectra, correction based on a relationship between the periodic motion and a phase fluctuation or a frequency fluctuation is performed on the partially integrated spectra, and the corrected partially integrated spectra are synthesized.
    Type: Application
    Filed: October 6, 2016
    Publication date: March 1, 2018
    Applicant: HITACHI, LTD.
    Inventor: Yoshitaka BITO
  • Publication number: 20180059198
    Abstract: Provided is a technique in calculating a magnetic susceptibility distribution by using an MRI, for reducing artifacts and noise and improving precision in the magnetic susceptibility distribution being calculated. According to this technique, a magnetic field distribution is obtained via a phase image from a complex image acquired through MRI. Under the constraint based on a relational expression between the magnetic field and the magnetic susceptibility, smoothing process is performed iteratively on the magnetic susceptibility distribution calculated from the magnetic field distribution. Specifically, a minimization process for minimizing through the iterative operation, an error function defined by a predetermined initial magnetic susceptibility distribution and the magnetic field distribution is performed, thereby calculating the magnetic susceptibility distribution.
    Type: Application
    Filed: October 19, 2015
    Publication date: March 1, 2018
    Inventors: Toru SHIRAI, Ryota SATOH, Yo TANIGUCHI, Hisaaki OCHI, Takenori MURASE, Yoshitaka BITO
  • 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
  • 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: 9709641
    Abstract: Disclosed is a magnetic resonance imaging apparatus that calculates a susceptibility map using a weighting image that reflects a phase variation with high accuracy. The weighting image is calculated from a phase image obtained from a complex image obtained by MRI. First, a region used in calculation of the phase variation is set as a calculation region, and then, a standard deviation or a variance of pixel values of the phase image in the calculation region is set as the phase variation. Further, the phase variation is converted into a weight that monotonically decreases in a broad sense as the phase variation increases to obtain the weighting image.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: July 18, 2017
    Assignee: Hitachi, Ltd.
    Inventors: Ryota Sato, Toru Shirai, Yo Taniguchi, Hisaaki Ochi, Yoshitaka Bito