Patents by Inventor Toru Shirai

Toru Shirai 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: 10436862
    Abstract: In an MRI apparatus, an imaging that produces almost no sound is implemented without extending an imaging time, not only for three-dimensional imaging, but also for two-dimensional imaging. A gradient pulse in a pulse sequence provided in the MRI apparatus is adjusted by using a basic waveform having a distribution of frequencies where strength dwindles substantially as the frequency increases from zero, and the waveform is convex upward or downward varying smoothly. An application time and strength are adjusted so that almost no sound is produced. Any imaging executable by a conventional pulse sequence can be implemented without producing almost any sound, using the conventional pulse sequence with little change.
    Type: Grant
    Filed: April 7, 2015
    Date of Patent: October 8, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Yo Taniguchi, Hiroyuki Takeuchi, Toru Shirai, Suguru Yokosawa, Shinji Kurokawa, Hisaaki Ochi
  • Patent number: 10408901
    Abstract: Acoustic noise reduction is achieved in a high-speed imaging method such as a phase-compensation type GE sequence, which is not provided with sufficiently long intervals for applying the gradient magnetic field pulses. A band-stop filter is used to reduce components of a frequency band in the gradient magnetic field waveform, having a high sound pressure level being a source of sound, thereby performing the noise reduction. In general, when a band of the gradient magnetic field is reduced, the waveform is likely to be considerably distorted, failing to satisfy imaging conditions. Therefore, the distorted waveform is shaped so that the imaging conditions are satisfied. The sound pressure level of the gradient magnetic field waveform is calculated by using a response function inherent to the device.
    Type: Grant
    Filed: May 19, 2015
    Date of Patent: September 10, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Yo Taniguchi, Toru Shirai, Hisaaki Ochi
  • Patent number: 10401444
    Abstract: A quantitative image (resonance frequency map) of a resonance frequency difference is obtained using a high-speed phase compensated pulse sequence of a gradient echo (GE) system. A signal function of the pulse sequence used when obtaining the resonance frequency map is generated by a numerical simulation. The high-speed phase compensated pulse sequence uses a BASG sequence, for example.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: September 3, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Yo Taniguchi, Toru Shirai, Suguru Yokosawa, Shinji Kurokawa, Hisaaki Ochi
  • 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
  • Publication number: 20190250231
    Abstract: A plurality of subject parameter maps are acquired at high speed. In addition to using an imaging sequence for generating both a gradient echo and a spin echo in a single imaging sequence, one or more parameters such as the longitudinal relaxation time T1 and the apparent transverse relaxation time T2* are calculated using the gradient echo and another parameter such as true transverse relaxation time T2 is calculated using the spin echo. When a value of one parameter is calculated, a value of the parameter calculated at the time of calculating the other parameter can be used.
    Type: Application
    Filed: October 11, 2017
    Publication date: August 15, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Yo TANIGUCHI, Hisaaki OCHI, Toru SHIRAI, Yoshihisa SOTOME, Suguru YOKOSAWA, Tomoki AMEMIYA
  • Publication number: 20190238496
    Abstract: A communication method includes the steps of transmitting, by means of a first communication apparatus, personal information to a second communication apparatus; receiving, by means of the second communication apparatus, the personal information and searching, by means of the second communication apparatus, whether or not personal information having the same content as the received personal information exists in the second communication apparatus; and notifying, by means of the second communication apparatus, the first communication apparatus of a search result.
    Type: Application
    Filed: April 9, 2019
    Publication date: August 1, 2019
    Applicant: Sony Corporation
    Inventors: Yoichiro Sako, Mitsuru Takehara, Toshiro Terauchi, Makoto Inoue, Motoyuki Takai, Masamichi Asukai, Katsuya Shirai, Takatoshi Nakamura, Toru Sasaki, Yuichi Sakai, Masafumi Matsuda
  • Publication number: 20190227134
    Abstract: In a case where a subject parameter distribution is obtained using MRI, a magnetization transfer effect is suppressed such that the calculation accuracy of T1 and T2 of brain parenchyma can be improved and a variation in the T1 value of blood caused by the effect of blood flow can be reduced. In imaging for parameter estimation, a magnetization transfer effect is suppressed by using a high frequency magnetic field pulse having a narrow frequency band as an excitation pulse. In a case where the frequency band is narrow, the high frequency magnetic field pulse has a shape in which the excitation profile is similar to a Gaussian function. A rising portion of the shape is arranged in a field of view where the head is an imaging target.
    Type: Application
    Filed: December 27, 2018
    Publication date: July 25, 2019
    Inventors: Yo TANIGUCHI, Tomoki AMEMIYA, Suguru YOKOSAWA, Toru SHIRAI, Hisaaki OCHI
  • Patent number: 10291577
    Abstract: A communication method includes the steps of transmitting, by means of a first communication apparatus, personal information to a second communication apparatus; receiving, by means of the second communication apparatus, the personal information and searching, by means of the second communication apparatus, whether or not personal information having the same content as the received personal information exists in the second communication apparatus; and notifying, by means of the second communication apparatus, the first communication apparatus of a search result.
    Type: Grant
    Filed: October 14, 2016
    Date of Patent: May 14, 2019
    Assignee: Sony Corporation
    Inventors: Yoichiro Sako, Mitsuru Takehara, Toshiro Terauchi, Makoto Inoue, Motoyuki Takai, Masamichi Asukai, Katsuya Shirai, Takatoshi Nakamura, Toru Sasaki, Yuichi Sakai, Masafumi Matsuda
  • 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
  • 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: 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: 10169866
    Abstract: To provide a technique for supporting diagnosis by reducing a user's time and effort in quantitative diagnosis using a quantitative value acquired by a medical image acquisition apparatus. A user is allowed in advance to select only desired diagnostic information from vast amounts of diagnostic information such as images and numerical values. Only the selected diagnostic information is presented to the user in a user-friendly mode. The diagnostic information is calculated by using a physical property value necessary for the calculation of the diagnostic information in question and calculation information such as arithmetic functions and variables, the physical property value and calculation information being stored in advance.
    Type: Grant
    Filed: April 22, 2014
    Date of Patent: January 1, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Suguru Yokosawa, Yo Taniguchi, Hisaaki Ochi, Toru Shirai, Shinji Kurokawa
  • 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: 10048341
    Abstract: When imaging is performed by executing a pulse sequence on an MRI apparatus, silencing is realized with securing sufficient application amount of crusher without extending the application time thereof. In the pulse sequence carried by the MRI apparatus, at least one gradient magnetic field pulse included in the pulse sequence has a waveform synthesized from two or more base waves shifting along the time axis direction (synthesized waveform), and the base waves have a smoothly changing waveform convex upward. The pulse of the synthesized waveform is generated from one or more trapezoidal or triangular base pulses by a waveform conversion part of a computer of the MRI apparatus or an external computer.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: August 14, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Yo Taniguchi, Toru Shirai, Suguru Yokosawa, Hisaaki Ochi, Shinji Kurokawa, Hiroyuki Takeuchi
  • Patent number: 9977105
    Abstract: Restriction on echo intervals is to be reduced in the Dixon's method without sacrificing separation performance and image quality. An image is reconstructed from echo signals measured at three or more different echo times. First and second peak frequency distributions in which aliasing (folding) due to echo time intervals is removed are calculated from the obtained images, and the first and second peak frequency distributions are used to obtain an offset frequency distribution. Note that these first peak frequency distribution and second peak frequency distribution are a distribution of peak frequencies obtained on the assumption that all of the pixels are the first substance and a distribution of peak frequencies obtained on the assumption that all of the pixels are the second substance, respectively. The offset frequency distribution and the obtained images are used to separate an image of the first substance from an image of the second substance.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: May 22, 2018
    Assignee: Hitachi, Ltd.
    Inventors: Toru Shirai, Yo Taniguchi, Hisaaki Ochi
  • Publication number: 20180081013
    Abstract: In an MRI apparatus, an imaging that produces almost no sound is implemented without extending an imaging time, not only for three-dimensional imaging, but also for two-dimensional imaging. A gradient pulse in a pulse sequence provided in the MRI apparatus is adjusted by using a basic waveform having a distribution of frequencies where strength dwindles substantially as the frequency increases from zero, and the waveform is convex upward or downward varying smoothly. An application time and strength are adjusted so that almost no sound is produced. Any imaging executable by a conventional pulse sequence can be implemented without producing almost any sound, using the conventional pulse sequence with little change.
    Type: Application
    Filed: April 7, 2015
    Publication date: March 22, 2018
    Inventors: Yo TANIGUCHI, Hiroyuki TAKEUCHI, Toru SHIRAI, Suguru YOKOSAWA, Shinji KUROKAWA, Hisaaki OCHI
  • 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
  • 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: D853329
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: July 9, 2019
    Assignee: SMC CORPORATION
    Inventors: Toru Nakayama, Koji Sugano, Yosuke Shirai