Patents by Inventor Suguru Yokosawa

Suguru Yokosawa 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: 11255939
    Abstract: A magnetic resonance imaging (MRI) apparatus performs automatic positioning with high accuracy within a short time with respect to tissues having a complicated anatomic structure. First measurement of scout imaging is executed before main imaging for acquiring a diagnosis image, and one-dimensional or two-dimensional measurement data is acquired. The right and left of a subject is determined by using the measurement data acquired in the first measurement. A cross-section position in second measurement of the scout imaging is calculated by using a determination result in the right and left determination and the measurement data acquired in the first measurement, the second measurement at the cross-section position is executed, and two-dimensional measurement data is acquired. A cross-section position in the main imaging is calculated by using the two-dimensional measurement data acquired in the second measurement.
    Type: Grant
    Filed: June 2, 2020
    Date of Patent: February 22, 2022
    Assignee: FUJIFILM HEALTHCARE CORPORATION
    Inventors: Suguru Yokosawa, Toru Shirai, Hisako Nagao, Chikako Moriwake, Binrong Wu
  • 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: 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
  • Publication number: 20210103021
    Abstract: Provided is a technology capable of realizing automatic positioning with high accuracy within a short time with respect to tissues having a complicated anatomic structure. First measurement of scout imaging is executed before main imaging for acquiring a diagnosis image, and one-dimensional or two-dimensional measurement data is acquired. The right and left of a subject is determined by using the measurement data acquired in the first measurement. A cross-section position in second measurement of the scout imaging is calculated by using a determination result in the right and left determination and the measurement data acquired in the first measurement, the second measurement at the cross-section position is executed, and two-dimensional measurement data is acquired. A cross-section position in the main imaging is calculated by using the two-dimensional measurement data acquired in the second measurement.
    Type: Application
    Filed: June 2, 2020
    Publication date: April 8, 2021
    Inventors: Suguru YOKOSAWA, Toru SHIRAI, Hisako NAGAO, Chikako MORIWAKE, Binrong WU
  • 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
  • Publication number: 20200380676
    Abstract: Provided is a technique for supporting a diagnosis in determining disease by using various types of measured values acquired by a medical image acquisition apparatus. An image diagnosis support device includes a measured-value receiving unit configured to receive various types of measured values at a plurality of positions within a living body, a group generator configured to generate groups of the measured values depending on the position or the type of the measured value, an intermediate index calculator configured to calculate an intermediate index from the measured values included in the group on a per-group basis, and a comprehensive index calculator configured to calculate a comprehensive index from values of the intermediate index calculated on a per-group basis. The intermediate index and the comprehensive index are displayed on a display unit in a display mode such as numerical values and in the form of an image.
    Type: Application
    Filed: May 21, 2020
    Publication date: December 3, 2020
    Inventors: Tomoki AMEMIYA, Ryota SATOH, Suguru YOKOSAWA, Toru SHIRAI, Hisaaki OCHI
  • 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
  • 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: 20200077893
    Abstract: An automatic clipping technique capable of satisfactorily extracting blood vessels to be extracted is provided. A specific tissue extraction mask image which is created by extracting a specific tissue (for example, a brain) from a three-dimensional image acquired by magnetic resonance angiography and a blood vessel extraction mask image which is created by extracting a blood vessel from an area (a blood vessel search area) which is determined using a preset landmark position and the specific tissue extraction mask image are integrated to create an integrated mask. By applying the integrated mask to the three-dimensional image, a blood vessel is clipped from the three-dimensional image.
    Type: Application
    Filed: April 15, 2019
    Publication date: March 12, 2020
    Applicant: Hitachi, Ltd.
    Inventors: Toru SHIRAI, Suguru YOKOSAWA, Hisako NAGAO, Yasuhide YOSHIDA, Yasuo KAWATA, Kuniaki HARADA
  • Publication number: 20200008702
    Abstract: An imaging unit of an MRI apparatus performs imaging of a positioning image of a subject including a spine; a first imaging that images a cross section including the spine and extending along a longitudinal direction of the spine; and a second imaging that images a cross section in a direction of traversing the spine. An automatic cross-section position setting unit detects a specific tissue of the spine using a scout image or an image including the spine acquired in the first imaging step, performs a matching process between the detected specific tissue of the spine and a spine model, and calculates an imaging cross-section position of the second imaging based upon a specific tissue position of the spine specified by matching, thereby performing automatic setting.
    Type: Application
    Filed: April 16, 2019
    Publication date: January 9, 2020
    Applicant: Hitachi, Ltd.
    Inventors: Suguru YOKOSAWA, Hisaaki OCHI, Yoshimi NOGUCHI, Kenta SAKURAGI, Hisako NAGAO, Kuniaki HARADA
  • 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: 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: 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: 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: 10292616
    Abstract: There is provided a technique for DWI measurement, in which MPG application is performed in many directions, that enables detection of presence or absence of body motion during imaging without prolongation of imaging time. A plurality of image groups each comprising 6 or more diffusion-weighted images selected from a plurality of diffusion-weighted images are created so the groups differ from one anther in one or more diffusion-weighted images included in each of the groups. Value of a predetermined diffusion index representing a characteristic amount of diffusion-weighted image is calculated for each image group from the diffusion-weighted images included in each image group. Value of a predetermined body motion index relating to body motion information is calculated from the value of the diffusion index for each image group. Presence or absence of body motion is determined for each image group on the basis of the value of the body motion index.
    Type: Grant
    Filed: August 27, 2015
    Date of Patent: May 21, 2019
    Assignee: Hitachi, Ltd.
    Inventors: Suguru Yokosawa, Hisaaki Ochi