Patents by Inventor Yo Taniguchi

Yo Taniguchi 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: 20210373104
    Abstract: In MRI, upon simultaneously generating computed images of multiple parameters, imaging time is efficiently reduced while preventing decrease in spatial resolution and SN ratio as much as possible. A plurality of original images is reconstructed from nuclear magnetic resonance signals acquired under various imaging conditions, and a computed image is obtained by calculation performed among the plurality of original images. The various imaging conditions include an imaging condition that a repetition time of an imaging sequence is different from one another, and upon imaging, the number of phase encoding steps is made smaller when the repetition time is long. An image is reconstructed in such a manner that a matrix size of the image obtained when the number of phase encoding steps is small is made equal to the matrix size of the image obtained when the number of phase encoding steps is large.
    Type: Application
    Filed: March 17, 2021
    Publication date: December 2, 2021
    Inventors: Yo TANIGUCHI, Hisaaki OCHI, Tomoki AMEMIYA, Toru SHIRAI
  • Patent number: 11187760
    Abstract: 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: Grant
    Filed: June 6, 2017
    Date of Patent: November 30, 2021
    Assignee: HITACHI, LTD.
    Inventors: Suguru Yokosawa, Yo Taniguchi, Hisaaki Ochi, Tomoki Amemiya, Yoshihisa Soutome
  • Patent number: 11147466
    Abstract: A system is disclosed to simultaneously acquire a magnetic resonance angiography (MRA) image and a plurality of images in which the structure of a tissue other than a blood vessel can be ascertained without performing imaging for the MRA image, and to shorten a time of MR examination. Two or more kinds of physical property dependent images obtained from a nuclear magnetic resonance signal measured in accordance with a predetermined pulse sequence under a plurality of imaging conditions are combined using a predetermined combination function.
    Type: Grant
    Filed: March 5, 2018
    Date of Patent: October 19, 2021
    Assignee: Hitachi, Ltd.
    Inventors: Tomoki Amemiya, Suguru Yokosawa, Yo Taniguchi, Hisaaki Ochi, Yoshihisa Sotome
  • Patent number: 11141078
    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: Grant
    Filed: May 24, 2017
    Date of Patent: October 12, 2021
    Assignee: HITACHI, LTD.
    Inventors: Ryota Satoh, Toru Shirai, Yo Taniguchi, Yoshitaka Bito, Hisaaki Ochi, Yoshihisa Sotome
  • Patent number: 11143728
    Abstract: To provide an MRI apparatus that acquires a plurality of contrast images including an FLAIR image in the shortest imaging time. An imaging controller of the MRI apparatus includes, as a prescribed pulse sequence, an IR (inversion recovery) sequence that includes application of an inversion pulse and a signal acquisition sequence to collect a signal after an inversion time has elapsed from the application of the inversion pulse, and acquires images in a first slice group, and an imaging sequence that is inserted into an inversion pulse of the IR sequence at a single time and an inversion pulse of the IR sequence at the next time, and acquires images in a second slice group different from the first slice group that are images having different contrasts from that of the IR sequence.
    Type: Grant
    Filed: June 11, 2020
    Date of Patent: October 12, 2021
    Assignee: HITACHI, LTD.
    Inventors: Tomoki Amemiya, Suguru Yokosawa, Yo Taniguchi, Yoru Shirai
  • Patent number: 11122988
    Abstract: A technology of improving image quality of a calculation image or parameter estimation accuracy even in a case where a method of simultaneously generating calculation images of a plurality of parameters is used is provided. Thus, by utilization of a reconstructed image in an optimal resolution of each parameter to be estimated, a value of the parameter is estimated and a calculation image that is a distribution of the value of the parameter is acquired. A reconstructed image in an optimal resolution is acquired by adjustment of a resolution of a reconstructed image acquired in an optimal resolution of an estimation parameter with the highest optimal resolution among parameters to be estimated in scanning. Alternatively, in scanning, only a reconstructed image used for calculation of a predetermined parameter to be estimated is acquired in an optimal resolution of the parameter to be estimated.
    Type: Grant
    Filed: August 6, 2015
    Date of Patent: September 21, 2021
    Assignee: HITACHI, LTD.
    Inventors: Yo Taniguchi, Suguru Yokosawa, Hisaaki Ochi, Toru Shirai, Shinji Kurokawa
  • Publication number: 20210199741
    Abstract: To provide an MRI apparatus that acquires a plurality of contrast images including an FLAIR image in the shortest imaging time. An imaging controller of the MRI apparatus includes, as a prescribed pulse sequence, an IR (inversion recovery) sequence that includes application of an inversion pulse and a signal acquisition sequence to collect a signal after an inversion time has elapsed from the application of the inversion pulse, and acquires images in a first slice group, and an imaging sequence that is inserted into an inversion pulse of the IR sequence at a single time and an inversion pulse of the IR sequence at the next time, and acquires images in a second slice group different from the first slice group that are images having different contrasts from that of the IR sequence.
    Type: Application
    Filed: June 11, 2020
    Publication date: July 1, 2021
    Inventors: Tomoki AMEMIYA, Suguru YOKOSAWA, Yo TANIGUCHI, Toru SHIRAI
  • Patent number: 10914804
    Abstract: A medical image diagnosis supporting apparatus includes a quantitative value reception unit that receives data of kinds of quantitative values obtained in advance at points in a region of a subject; a variable conversion unit that calculates kinds of intermediate information values dependent on the kinds of quantitative values at each of the points using the kinds of quantitative values at each of the points and kinds of variable conversion functions; and a diagnosis image calculation unit that calculates a diagnosis image for the region. The diagnosis image calculation unit sets a pixel value at each of the points in accordance with a combination of kinds of intermediate information values obtained at each of the points by the variable conversion unit or a combination of intermediate information values and kinds of quantitative values at the point and generates the diagnosis image.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: February 9, 2021
    Assignee: HITACHI, LTD.
    Inventors: Tomoki Amemiya, Suguru Yokosawa, Yo Taniguchi, Hisaaki Ochi
  • Patent number: 10866296
    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: Grant
    Filed: October 11, 2017
    Date of Patent: December 15, 2020
    Assignee: HITACHI, LTD.
    Inventors: Yo Taniguchi, Hisaaki Ochi, Toru Shirai, Yoshihisa Sotome, Suguru Yokosawa, Tomoki Amemiya
  • Patent number: 10823792
    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: Grant
    Filed: December 27, 2018
    Date of Patent: November 3, 2020
    Assignee: HITACHI, LTD.
    Inventors: Yo Taniguchi, Tomoki Amemiya, Suguru Yokosawa, Toru Shirai, Hisaaki Ochi
  • 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: 20200278411
    Abstract: An MRI device for executing an imaging operation at least three times or more with a different combination of at least a repetition time and a flip angle in the same imaging sequence, includes: a receiving unit which receives information specifying an imaging target and a constraint condition relating to an imaging time or quantitative value accuracy; and a scan parameter set generation unit which calculates at least three or more scan parameter sets having a different combination of at least the repetition time and the flip angle on the basis of the constraint condition. The MRI device uses three or more scan parameter sets generated by the optimal scan parameter set generation unit and calculates quantitative values (T1, T2, and the like) of the imaging target from a plurality of images obtained by the imaging operation.
    Type: Application
    Filed: August 24, 2018
    Publication date: September 3, 2020
    Inventors: Suguru YOKOSAWA, Yo TANIGUCHI, Tomoki AMEMIYA, Toru SHIRAI, Hisaaki OCHI
  • Publication number: 20200142017
    Abstract: A myelin image is generated with a stable contrast regardless of an imaging condition with an MRI apparatus that measures an echo signal generated from a subject by applying a high-frequency magnetic field and a gradient magnetic field to the subject placed in a static magnetic field according to a predetermined imaging sequence. A reconstructed image is obtained from the echo signal. A distribution of a quantitative value of the subject is estimated using a plurality of the reconstructed images, each of which is obtained by a plurality of types of imaging having different imaging conditions of the imaging sequence, and a signal function defining a relationship between the quantitative value of the subject and a signal value of the reconstructed image. An image generation unit generates an arbitrary image from the distribution of the quantitative value.
    Type: Application
    Filed: November 6, 2019
    Publication date: May 7, 2020
    Inventors: Yo TANIGUCHI, Yuki KANAZAWA, Masaharu ONO
  • 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
  • Publication number: 20190311806
    Abstract: Two or more learning images generated for a first subject or a second subject and one or more correct answer images generated for the second subject or a third subject are received. In a case where pixel values of corresponding pixels of the two or more learning images are synthesized by using a synthesis parameter value, the parameter value at which the synthesized pixel values are close to a pixel value of a corresponding pixel of the correct answer image is obtained. An image generated for the first subject and having the same type as the two or more learning images is received as an examination target image. A synthesized image desired by a user is generated by synthesizing pixel values of corresponding pixels of the two or more examination target images by using the synthesis parameter value.
    Type: Application
    Filed: March 22, 2019
    Publication date: October 10, 2019
    Applicant: Hitachi, Ltd.
    Inventors: Tomoki AMEMIYA, Yo TANIGUCHI, Suguru YOKOSAWA, Hisaaki OCHI
  • 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: 10429461
    Abstract: A magnetic resonance imaging device produces a magnetic field gradient with parallel driving of positive-side subcoils and negative-side subcoils with different power sources in the magnetic field gradient direction, to detect a misalignment in drive timing of the positive side and the negative side. Pulse sequences for timing misalignment detection having a slice magnetic field gradient pulse and a read-out magnetic field gradient pulse in the same direction as a magnetic field gradient of interest are executed. A positive-side slice echo and a negative-side slice echo of the magnetic field gradient are acquired. A phase difference between a positive-side projection image and a negative-side projection image is derived by computation with phase error from other factors being removed. From the slope of the phase difference with respect to a location, the drive timing misalignment between the positive-side subcoil and the negative-side subcoil of the magnetic field gradient production is detected.
    Type: Grant
    Filed: December 4, 2013
    Date of Patent: October 1, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Yo Taniguchi, Masahiro Takizawa, Takeshi Yatsuo, Atsushi Kuratani
  • 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