公开(公告)号：US20170202527A1

公开(公告)日：2017-07-20

申请号：US15323980

申请日：2015-06-22

Applicant: HITACHI, LTD.

Inventor： Shinji KUROKAWA ,  Yushi TSUBOTA

IPC: A61B6/00 ,  A61B6/04 ,  A61B6/03

CPC classification number: A61B6/4021 ,  A61B6/032 ,  A61B6/0407 ,  A61B6/42 ,  A61B6/4429 ,  A61B6/461 ,  A61B6/467 ,  A61B6/5205 ,  A61B6/5258 ,  A61B6/54

Abstract: An X-ray CT device which improves resolution in a peripheral region distant from a rotation center. According to an FFS method of moving an X-ray focal point, a gap width of projection positions on an X-ray detector of a first X-ray trajectory from the X-ray focal point of a first view and a second X-ray trajectory from the X-ray focal point of a second view is obtained. A position of the X-ray focal point of the first and second views is set so that a gap width 15 of the projection positions on the X-ray detector of the first X-ray trajectory and the second X-ray trajectory which pass through a point within a predetermined first region close to the X-ray focal point from the rotation center is closer to (N−½) times (N=any one of 1, 2, 3, . . . ) of a width of a channel of the X-ray detector.

公开(公告)号：US20170018080A1

公开(公告)日：2017-01-19

申请号：US15300830

申请日：2014-04-22

Applicant: HITACHI, LTD.

Inventor： Suguru YOKOSAWA ,  Yo TANIGUCHI ,  Hisaaki OCHI ,  Toru SHIRAI ,  Shinji KUROKAWA

IPC: G06T7/00 ,  G06T11/60 ,  G06F3/0484 ,  A61B5/055

CPC classification number: G06T7/0012 ,  A61B5/055 ,  A61B5/7435 ,  A61B6/032 ,  A61B6/5217 ,  A61B8/485 ,  A61B8/5223 ,  G06F3/04847 ,  G06T11/60 ,  G06T2200/24 ,  G06T2207/10088 ,  G06T2207/30004

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.

Abstract translation: 提供一种用于通过使用由医学图像采集装置获取的定量值减少用户在定量诊断中的时间和精力来支持诊断的技术。 允许用户提前从大量诊断信息（如图像和数值）中选择所需的诊断信息。 只有选择的诊断信息以用户友好的方式呈现给用户。 通过使用关于所述诊断信息的计算所需的物理属性值以及诸如算术功能和变量的计算信息，物理特性值和计算信息被预先存储来计算诊断信息。

公开(公告)号：US20210333347A1

公开(公告)日：2021-10-28

申请号：US17205238

申请日：2021-03-18

Applicant: Hitachi, Ltd.

Inventor： Hiroki SHOJI ,  Toru SHIRAI ,  Shinji KUROKAWA

IPC: G01R33/56 ,  G06T3/40 ,  G16H30/40

Abstract: Provided is a magnetic resonance imaging apparatus with no occurrence of artifacts, even after noise removal by applying Wavelet transform to a zero-fill reconstructed image. Nuclear magnetic resonance signals acquired by the magnetic resonance imaging apparatus are processed to perform reconstruction with a reconstruction matrix extended by zero-filling an acquisition matrix, and then a zero-fill reconstructed image is produced. This reconstructed image is subjected to an iterative operation combining the Wavelet transform and L1 norm minimization to remove noise. Before the noise removal, a pre-processing is performed to change the reconstruction matrix size so that an artifact does not occur in the image after noise removal, an artifact portion appears outside the reconstruction matrix after the noise removal, or cutting out is performed so that no artifact appears after the noise removal. The matrix size is restored to its original size in the post-processing after the noise removal.

公开(公告)号：US20180081013A1

公开(公告)日：2018-03-22

申请号：US15558263

申请日：2015-04-07

Applicant: Hitachi, Ltd.

Inventor： Yo TANIGUCHI ,  Hiroyuki TAKEUCHI ,  Toru SHIRAI ,  Suguru YOKOSAWA ,  Shinji KUROKAWA ,  Hisaaki OCHI

IPC: G01R33/385

CPC classification number: G01R33/3854 ,  A61B5/055 ,  G01R33/482

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.

公开(公告)号：US20170209067A1

公开(公告)日：2017-07-27

申请号：US15107540

申请日：2015-08-06

Applicant: HITACHI, LTD.

Inventor： Yo TANIGUCHI ,  Suguru YOKOSAWA ,  Hisaaki OCHI ,  Toru SHIRAI ,  Shinji KUROKAWA

IPC: A61B5/055

CPC classification number: A61B5/055 ,  G01R33/246 ,  G01R33/4835 ,  G01R33/50 ,  G01R33/5602 ,  G01R33/5608 ,  G01R33/5616

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.

公开(公告)号：US20170176609A1

公开(公告)日：2017-06-22

申请号：US15325497

申请日：2015-07-23

Applicant: HITACHI, LTD.

Inventor： Yushi TSUBOTA ,  Shinji KUROKAWA ,  Keisuke YAMAKAWA ,  Yasutaka KONNO ,  Shinichi KOJIMA ,  Fumito WATANABE

IPC: G01T1/29 ,  G01N23/04 ,  A61B6/00 ,  A61B6/03

CPC classification number: G01T1/2985 ,  A61B6/032 ,  A61B6/4233 ,  G01N23/046

Abstract: Provided is a technique in an X-ray imaging apparatus for implementing data interpolation approximating an ideal point response trajectory interpolation, along with reducing calculation load. A method is provided to perform interpolation at high speed, in a direction along the point response trajectory. Sinograms are interpolated in advance from measured data, as to representative angles (e.g., 0°, ±30°, ±60°, and 90°) only. When a pixel targeted for back projection is determined at the time of reconstruction, a slope of the point response trajectory is determined as to each view. According to the slope of the trajectory, each representative sinogram is added with weight, whereby interpolation data in association with any angle can be obtained.