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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
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.
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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.
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公开(公告)号：US20200260958A1
公开(公告)日：2020-08-20
申请号：US16646033
申请日：2018-06-01
Applicant: Hitachi, Ltd.
Inventor： Toru SHIRAI , Ryota SATOH , Hisaaki OCHI , Takenori MURASE , Yoshitaka BITO
Abstract: A magnetic resonance imaging apparatus includes: a static magnetic field generating magnet configured to generate a static magnetic field in a space where a subject is arranged; a transmission unit configured to transmit a high frequency magnetic field to the subject; a reception unit configured to receive a nuclear magnetic resonance signal generated in the subject due to transmission of the high-frequency magnetic field thereto; a gradient magnetic field application unit configured to apply a gradient magnetic field which adds positional information to the nuclear magnetic resonance signal; a computer configured to control the transmission unit, the reception unit, and the gradient magnetic field application unit, and configured to process the nuclear magnetic resonance signal; and a display unit configured to display an image processed by the computer; and the computer performs a predetermined calculation processing.
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4.发明申请公开(公告)号：US20200074635A1
公开(公告)日：2020-03-05
申请号：US16384387
申请日：2019-04-15
Applicant: Hitachi, Ltd.
Inventor： Ryota SATOH , Kohsuke KUDO , Toru SHIRAI , Yasuo KAWATA
Abstract: Provided is an image processor including a tissue-segmentation-processing-unit that performs tissue segmentation processing on at least one of a plurality of complex images generated based on a magnetic resonance signal generated from a subject to calculate a tissue-image related to a predetermined specific tissue, a magnetic-susceptibility-image-calculation-unit that calculates a magnetic-susceptibility-image showing magnetic susceptibility of a predetermined tissue included in the complex image from the complex image, an anatomical-standardization-processing-unit that calculates a standard-magnetic-susceptibility-image and a spatially-normalized tissue-image by performing spatially normalization processing on the magnetic-susceptibility-image and the tissue-image and calculates a volume modulated spatially-normalized tissue-image obtained by performing volume modulation on the spatially-normalized tissue-image, a magnetic-susceptibility-calculation-unit that calculates magnetic susceptibility of the specific tissue based on the spatially-normalized -magnetic-susceptibility-image and the spatially-normalized tissue-image, and a diagnostic-index-calculation-unit that calculates a diagnostic index for diagnosing a predetermined disease based on the magnetic susceptibility of the specific tissue and the volume modulated spatially-normalized tissue-image.
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5.发明申请公开(公告)号：US20190261906A1
公开(公告)日：2019-08-29
申请号：US16342612
申请日：2017-10-11
Applicant: Hitachi, Ltd.
Inventor： Toru SHIRAI , Ryota SATOH , Yo TANIGUCHI , Hisaaki OCHI , Yoshihisa SOTOME , Yoshitaka BITO , Takenori MURASE
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.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20170192068A1
公开(公告)日：2017-07-06
申请号：US15313983
申请日：2015-05-19
Applicant: Hitachi, Ltd.
Inventor： Yo TANIGUCHI , Toru SHIRAI , Hisaaki OCHI
IPC: G01R33/385 , G01R33/561 , A61B5/055
CPC classification number: G01R33/3854 , A61B5/055 , G01R33/288 , G01R33/561
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.
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公开(公告)号：US20160161580A1
公开(公告)日：2016-06-09
申请号：US14904202
申请日：2013-08-07
Applicant: HITACHI, LTD.
Inventor： Toru SHIRAI , Yo TANIGUCHI , Hisaaki OCHI
CPC classification number: G01R33/4828 , A61B5/00 , A61B5/055 , G01R33/34053 , G01R33/3806 , G01R33/485 , G01R33/543 , G01R33/5607 , G01R33/5608
Abstract: Restriction on echo intervals is to be reduced in the Dixon's method without sacrificing separation performance and image quality. An image is reconstructed from echo signals measured at three or more different echo times. First and second peak frequency distributions in which aliasing (folding) due to echo time intervals is removed are calculated from the obtained images, and the first and second peak frequency distributions are used to obtain an offset frequency distribution. Note that these first peak frequency distribution and second peak frequency distribution are a distribution of peak frequencies obtained on the assumption that all of the pixels are the first substance and a distribution of peak frequencies obtained on the assumption that all of the pixels are the second substance, respectively. The offset frequency distribution and the obtained images are used to separate an image of the first substance from an image of the second substance.
Abstract translation: 在Dixon的方法中减少对回波间隔的限制，而不会牺牲分离性能和图像质量。 从在三个或更多个不同回波时间测量的回波信号重建图像。 从所获得的图像中计算由于回波时间间隔而导致的混叠（折叠）的第一和第二峰值频率分布，并且使用第一和第二峰值频率分布来获得偏移频率分布。 注意，这些第一峰值频率分布和第二峰值频率分布是假定所有像素都是第一物质而获得的峰值频率的分布，并且假定所有像素都是第二物质而获得的峰值频率分布 ， 分别。 偏移频率分布和所获得的图像用于将第一物质的图像与第二物质的图像分离。
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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
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.
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公开(公告)号：US20210068700A1
公开(公告)日：2021-03-11
申请号：US16771449
申请日：2018-09-13
Applicant: Hitachi, Ltd.
Inventor： Toru SHIRAI , Yasuhiro KAMADA , Masahiro TAKIZAWA , Hisaaki OCHI
Abstract: To calculate a high-resolution coil sensitivity distribution that does not depend on a shape or a structure of a subject with high accuracy. An MRI apparatus of the invention includes: a measurement unit that includes a reception coil including a plurality of channels, a measurement unit that measures a nuclear magnetic resonance signal of a subject for every channel of the reception coil; and an image computation unit that creates an image of the subject by using a sensitivity distribution for every channel of the reception coil, and a channel image obtained from the nuclear magnetic resonance signal measured by the measurement unit for every channel. The image computation unit includes a sensitivity distribution calculation unit that calculates a sensitivity distribution on a k-space for every channel by using the channel images and a composite image obtained by combining the channel images.
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公开(公告)号：US20200258199A1
公开(公告)日：2020-08-13
申请号：US16639407
申请日：2018-07-27
Applicant: Hitachi, Ltd.
Inventor： Toru SHIRAI , Ryota SATOH , Yasuhiro KAMADA , Masahiro TAKIZAWA , Yoshihisa SOTOME
IPC: G06T5/00 , G01R33/56 , G01R33/565 , G06T5/50
Abstract: In an image acquired by a plurality of receiver coils with the use of MRI, separated images are obtained by separating spatially overlapping signals according to PI method, and noise in the separated images is eliminated with a high degree of precision. A complex image spatially overlapping is measured from nuclear magnetic resonance signals received by a plurality of receiver coils, and spatially overlapping signals are separated and a plurality of separated images are calculated, by using sensitivity information of the plurality of receiver coils. Then, noise is eliminated based on a correlation of noise mixed between the separated images.
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