公开(公告)号：US20210193299A1

公开(公告)日：2021-06-24

申请号：US16896309

申请日：2020-06-09

Applicant: Hitachi, Ltd.

Inventor： Ryota SATOH ,  Tomoki AMEMIYA ,  Toru SHIRAI ,  Yoshitaka BITO

IPC: G16H30/40 ,  G06T7/00 ,  A61B5/055 ,  A61B5/00 ,  G06N20/00

Abstract: The most appropriate image for a diagnostic target among a plurality of images is selected and accurate diagnosis support information is presented regardless of the type of a selected image, a modality, or the like. An image diagnosis support apparatus includes: a diagnostic information generation unit that generates diagnostic information based on a plurality of medical images; a reliability calculation unit that evaluates an image quality and calculates an image reliability for each of the plurality of medical images; and a degree-of-contribution calculation unit that calculates a degree of contribution of each of the plurality of medical images to the diagnostic information using an internal parameter indicating a degree of appropriateness of each medical image for a diagnostic target and the reliability calculated by the reliability calculation unit. An image for detection used by the diagnostic information generation unit is generated based on the degree of contribution.

公开(公告)号：US20200278411A1

公开(公告)日：2020-09-03

申请号：US16756177

申请日：2018-08-24

Applicant: HITACHI, LTD.

Inventor： Suguru YOKOSAWA ,  Yo TANIGUCHI ,  Tomoki AMEMIYA ,  Toru SHIRAI ,  Hisaaki OCHI

IPC: G01R33/561 ,  G01R33/50 ,  G01R33/56 ,  A61B5/055

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.

公开(公告)号：US20180338701A1

公开(公告)日：2018-11-29

申请号：US15911289

申请日：2018-03-05

Applicant: Hitachi, Ltd.

Inventor： Tomoki AMEMIYA ,  Suguru YOKOSAWA ,  Yo TANIGUCHI ,  Hisaaki OCHI ,  Yoshihisa SOTOME

IPC: A61B5/055 ,  G01R33/561 ,  G01R33/563

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. At this time, a plurality of division regions are set in the physical property dependent image, and the combination parameter satisfying a condition that a difference between a pixel value of the specific tissue and a pixel value of a tissue other than the specific tissue increases is determined at each of the division regions in the actually measured two or more kinds of physical property dependent images, using standard data of the two or more kinds of physical property dependent images, and the combination parameter is used to combine the two or more kinds of images.

公开(公告)号：US20180284208A1

公开(公告)日：2018-10-04

申请号：US15759112

申请日：2016-02-05

Applicant: HITACHI, LTD.

Inventor： Tomoki AMEMIYA ,  Suguru YOKOSAWA ,  Yo TANIGUCHI ,  Hisaaki OCHI

IPC: G01R33/56 ,  A61B5/026 ,  G06T3/40 ,  G06T5/40 ,  G01R33/563

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.

公开(公告)号：US20180028273A1

公开(公告)日：2018-02-01

申请号：US15614782

申请日：2017-06-06

Applicant: Hitachi, Ltd.

Inventor： Suguru YOKOSAWA ,  Yo TANIGUCHI ,  Hisaaki OCHI ,  Tomoki AMEMIYA ,  Yoshihisa SOUTOME

IPC: A61B90/00 ,  H04N19/105

CPC classification number: A61B90/37 ,  A61B5/055 ,  A61B2090/374 ,  G01R33/00 ,  G01R33/50 ,  G01R33/5608 ,  G01R33/561 ,  H04N19/105

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.

公开(公告)号：US20210199741A1

公开(公告)日：2021-07-01

申请号：US16898798

申请日：2020-06-11

Applicant: Hitachi, Ltd.

Inventor： Tomoki AMEMIYA ,  Suguru YOKOSAWA ,  Yo TANIGUCHI ,  Toru SHIRAI

IPC: G01R33/483 ,  G01R33/561

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.

公开(公告)号：US20210166388A1

公开(公告)日：2021-06-03

申请号：US16890042

申请日：2020-06-02

Applicant: Hitachi, Ltd.

Inventor： Toru SHIRAI ,  Ryota SATOH ,  Yasuo KAWATA ,  Tomoki AMEMIYA ,  Yoshitaka BITO ,  Hisaaki OCHI

IPC: G06T7/00 ,  G16H30/40 ,  G16H50/70 ,  G16H50/20 ,  A61B5/00 ,  A61B5/02 ,  A61B5/03 ,  G06F16/51 ,  G06F16/55

Abstract: In brain analysis, anatomical standardization is performed when analyzing a region of interest (ROI). There are individual differences in the shape and size of the brain and by converting the brain into a standard brain, these differences can be compared with each other and subjected to statistical analysis. When generating a standard brain analysis, a large number of pieces of image data are classified into a plurality of groups based on their anatomical features. An intermediate template that is an intermediate conversion image and a conversion map is calculated for each group, and the calculation of the intermediate template and the generation of the intermediate conversion image are repeated while gradually reducing the number of classifications, so that a final standard image is generated. Using the standard image and the intermediate template calculated during the generation of the standard image, spatial standardization of the measured image is performed.

公开(公告)号：US20190311806A1

公开(公告)日：2019-10-10

申请号：US16361839

申请日：2019-03-22

Applicant: Hitachi, Ltd.

Inventor： Tomoki AMEMIYA ,  Yo TANIGUCHI ,  Suguru YOKOSAWA ,  Hisaaki OCHI

IPC: G16H50/20 ,  G06T7/00 ,  G16H30/40 ,  A61B5/00 ,  A61B5/055 ,  G01R33/56 ,  G01R33/565

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.

公开(公告)号：US20190227134A1

公开(公告)日：2019-07-25

申请号：US16233154

申请日：2018-12-27

Applicant: Hitachi, Ltd.

Inventor： Yo TANIGUCHI ,  Tomoki AMEMIYA ,  Suguru YOKOSAWA ,  Toru SHIRAI ,  Hisaaki OCHI

IPC: G01R33/36 ,  G01R33/56 ,  G01R33/385 ,  G06T11/00 ,  A61B5/055

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.

公开(公告)号：US20210373104A1

公开(公告)日：2021-12-02

申请号：US17203944

申请日：2021-03-17

Applicant: Hitachi, Ltd.

Inventor： Yo TANIGUCHI ,  Hisaaki OCHI ,  Tomoki AMEMIYA ,  Toru SHIRAI

IPC: G01R33/54 ,  G01R33/56 ,  G01R33/48

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.