公开(公告)号：US11187760B2

公开(公告)日：2021-11-30

申请号：US15614782

申请日：2017-06-06

申请人： Hitachi, Ltd.

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Hisaaki Ochi ,  Tomoki Amemiya ,  Yoshihisa Soutome

IPC分类号： G01R33/00 ,  G01R33/50 ,  G01R33/54 ,  A61B5/055 ,  H04N19/105 ,  A61B90/00 ,  G01R33/56 ,  G01R33/561

摘要： 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：US11147466B2

公开(公告)日：2021-10-19

申请号：US15911289

申请日：2018-03-05

申请人： Hitachi, Ltd.

发明人： Tomoki Amemiya ,  Suguru Yokosawa ,  Yo Taniguchi ,  Hisaaki Ochi ,  Yoshihisa Sotome

IPC分类号： A61B5/055 ,  G01R33/563 ,  G01R33/561 ,  G01R33/56 ,  A61B5/00 ,  A61B5/02 ,  G01R33/54

摘要： 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：US11122988B2

公开(公告)日：2021-09-21

申请号：US15107540

申请日：2015-08-06

申请人： HITACHI, LTD.

发明人： Yo Taniguchi ,  Suguru Yokosawa ,  Hisaaki Ochi ,  Toru Shirai ,  Shinji Kurokawa

IPC分类号： A61B5/055 ,  G01R33/56 ,  G01R33/387 ,  G01R33/565 ,  G01R33/24 ,  G01R33/483 ,  G01R33/561 ,  G01R33/50

摘要： 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.

公开(公告)号：US11701024B2

公开(公告)日：2023-07-18

申请号：US16384038

申请日：2019-04-15

申请人： Hitachi, Ltd.

发明人： Toru Shirai ,  Suguru Yokosawa ,  Hisako Nagao ,  Yasuhide Yoshida ,  Yasuo Kawata ,  Kuniaki Harada

IPC分类号： A61B5/055 ,  A61B5/00 ,  G06T7/00 ,  G06T15/30 ,  G06T3/00 ,  G01R33/563 ,  G01R33/56 ,  A61B5/02 ,  G06V10/25 ,  G06V20/64

CPC分类号： A61B5/055 ,  A61B5/0042 ,  A61B5/02007 ,  G01R33/5608 ,  G01R33/5635 ,  G06T3/0068 ,  G06T7/0012 ,  G06T15/30 ,  G06V10/25 ,  G06V20/64 ,  G06T2207/10088 ,  G06T2207/20081 ,  G06T2207/20182 ,  G06T2207/30016 ,  G06T2207/30104

摘要： 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.

公开(公告)号：US11428769B2

公开(公告)日：2022-08-30

申请号：US16756177

申请日：2018-08-24

申请人： HITACHI, LTD.

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Tomoki Amemiya ,  Toru Shirai ,  Hisaaki Ochi

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

摘要： 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：US10436862B2

公开(公告)日：2019-10-08

申请号：US15558263

申请日：2015-04-07

申请人： Hitachi, Ltd.

发明人： Yo Taniguchi ,  Hiroyuki Takeuchi ,  Toru Shirai ,  Suguru Yokosawa ,  Shinji Kurokawa ,  Hisaaki Ochi

IPC分类号： G01R33/385 ,  A61B5/055 ,  G01R33/48

摘要： 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.

公开(公告)号：US11255939B2

公开(公告)日：2022-02-22

申请号：US16889987

申请日：2020-06-02

申请人： Hitachi, Ltd.

发明人： Suguru Yokosawa ,  Toru Shirai ,  Hisako Nagao ,  Chikako Moriwake ,  Binrong Wu

IPC分类号： G01R33/56 ,  G01R33/54 ,  A61B5/107 ,  A61B5/055

摘要： 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.

公开(公告)号：US11143728B2

公开(公告)日：2021-10-12

申请号：US16898798

申请日：2020-06-11

申请人： Hitachi, Ltd.

发明人： Tomoki Amemiya ,  Suguru Yokosawa ,  Yo Taniguchi ,  Yoru Shirai

IPC分类号： G01R33/483 ,  G01R33/561

摘要： 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：US10185017B2

公开(公告)日：2019-01-22

申请号：US14336144

申请日：2014-07-21

申请人： Hitachi, Ltd.

发明人： Suguru Yokosawa ,  Hisaaki Ochi ,  Yoshitaka Bito

IPC分类号： G01R33/563 ,  G01R33/56

摘要： 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.

公开(公告)号：US10048341B2

公开(公告)日：2018-08-14

申请号：US14615494

申请日：2015-02-06

申请人： Hitachi, Ltd.

发明人： Yo Taniguchi ,  Toru Shirai ,  Suguru Yokosawa ,  Hisaaki Ochi ,  Shinji Kurokawa ,  Hiroyuki Takeuchi

IPC分类号： G01V3/00 ,  G01R33/54 ,  G01R33/385

摘要： 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.