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11. 发明授权

US07372269B2 Magnetic resonance imaging method and apparatus 有权
标题翻译：磁共振成像方法和装置
公开(公告)号：US07372269B2
公开(公告)日：2008-05-13
申请号：US10553900
申请日：2004-04-23
申请人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
IPC分类号： G01V3/00
CPC分类号： G01R33/4824 , G01R33/5611
摘要： In a magnetic resonance imaging apparatus, an RF pulse is applied to a subject placed in a static magnetic field, a plurality of gradient magnetic fields are applied, and induced nuclear magnetic resonance signal (echo signal) is received by means of a RF receiving coil unit composed of two or more RF receiving coils. A parallel MRI method is applied to echo signals acquired by reducing the echoes per blade of a propeller MRI method so as to remove the artifact to produce a reconstructed image. The reconstructed image is subjected to inverse Fourier transform to return it to the echo signals in a measurement space corresponding to the blade. The echo signals are girded in an arbitrarily predetermined coordinate system for image and combined. Such a processing is conducted for the echo signals of all the blades. A final image is reconstructed using the echo signals after the image creation in the coordinate system for image.
摘要翻译：在磁共振成像装置中，将RF脉冲施加到放置在静态磁场中的被摄体，施加多个梯度磁场，并且通过RF接收线圈接收感应的核磁共振信号（回波信号）单元由两个或更多个RF接收线圈组成。将并行MRI方法应用于通过减小螺旋桨MRI方法的每个叶片的回波而获得的回波信号，以便去除伪影以产生重建图像。对重构图像进行傅立叶逆变换，将其返回到与叶片对应的测量空间中的回波信号。回波信号被束缚在用于图像并组合的任意预定的坐标系中。对所有叶片的回波信号进行这样的处理。在用于图像的坐标系中的图像创建之后，使用回波信号重建最终图像。

12. 发明申请

US20060232273A1 Magnetic resonance imaging method and apparatus 有权
标题翻译：磁共振成像方法和装置
公开(公告)号：US20060232273A1
公开(公告)日：2006-10-19
申请号：US10553900
申请日：2004-04-23
申请人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
发明人： Masahiro Takizawa , Tetsuhiko Takahashi , Yo Taniguchi
IPC分类号： G01V3/00 , A61B5/05
CPC分类号： G01R33/4824 , G01R33/5611
摘要： High-speed imaging by a propeller MRI method is enabled as a whole thanks to high-speed computation by preventing an aliasing artifact even if the echoes acquired by one blade are decreased and by reducing the imaging time and the computational complexity. In a magnetic resonance imaging apparatus, an RF pulse is applied to a subject placed in a static magnetic field, a plurality of gradient magnetic fields are applied, and induced nuclear magnetic resonance signal (echo signal) is received by means of a multiple RF receiving coil unit composed of two or more RF receiving coils. A parallel MRI method is applied to echo signals acquired by reducing the echoes per blade of a propeller MRI method so as to remove the artifact to produce a reconstructed image. The reconstructed image is subjected to inverse Fourier transform to return it to the echo signals in a measurement space corresponding to the blade. The echo signals are girded in an arbitrarily predetermined coordinate system for image and combined. Such a processing is conducted for the echo signals of all the blades. A final image is reconstructed using the echo signals after the image creation in the coordinate system for image.
摘要翻译：通过螺旋桨MRI方法的高速成像由于高速计算，即使通过防止由一个叶片获得的回波减少并且通过减少成像时间和计算复杂度来防止混叠伪影，也能够实现。在磁共振成像装置中，将RF脉冲施加到放置在静态磁场中的被摄体，施加多个梯度磁场，并且通过多个RF接收来接收诱导的核磁共振信号（回波信号）线圈单元由两个或更多个RF接收线圈组成。将并行MRI方法应用于通过减小螺旋桨MRI方法的每个叶片的回波而获得的回波信号，以便去除伪影以产生重建图像。对重构图像进行傅立叶逆变换，将其返回到与叶片对应的测量空间中的回波信号。回波信号被束缚在用于图像并组合的任意预定的坐标系中。对所有叶片的回波信号进行这样的处理。在用于图像的坐标系中的图像创建之后，使用回波信号重建最终图像。

13. 发明申请

US20080231272A1 Magnetic Resonance Imager 有权
标题翻译：磁共振成像仪
公开(公告)号：US20080231272A1
公开(公告)日：2008-09-25
申请号：US10586732
申请日：2004-12-24
申请人： Yo Taniguchi , Shinji Kurokawa , Hisaaki Ochi
发明人： Yo Taniguchi , Shinji Kurokawa , Hisaaki Ochi
IPC分类号： G01R33/54
CPC分类号： G01R33/561 , G01R33/4818 , G01R33/4824 , G01R33/565 , G01R33/56509
摘要： Provided is a magnetic resonance imager capable of efficiently suppressing artifacts in radial scanning that is short of the number of echoes.Part of unmeasured echoes is measured as a reference echo. An estimation coefficient is calculated using echoes adjoining the reference echo, and used to estimate the unmeasured echoes.
摘要翻译：提供一种能够有效地抑制径向扫描中的伪像不足回波数的磁共振成像器。测量部分未测量的回波作为参考回波。使用与参考回波相邻的回波计算估计系数，并用于估计未测量的回波。

14. 发明授权

US5808467A RF probe and inspection system using NMR using the same 失效
标题翻译：射频探头和使用核磁共振的检查系统
公开(公告)号：US5808467A
公开(公告)日：1998-09-15
申请号：US653315
申请日：1996-05-24
申请人： Hisaaki Ochi , Yo Taniguchi , Kenichi Okajima , Yoshitaka Bito , Etsuji Yamamoto
发明人： Hisaaki Ochi , Yo Taniguchi , Kenichi Okajima , Yoshitaka Bito , Etsuji Yamamoto
IPC分类号： G01R33/3415 , G01V3/00
CPC分类号： G01R33/3415
摘要： In the inspection system using nuclear magnetic resonance comprising magnetic field generators such as a static magnetic field, a gradient magnetic field, and an RF magnetic field, an RF probe for detecting an NMR signal from a subject, and a calculator for operating a detected signal by the RF probe, a RF probe for detection comprises a plurality of coils arranged in the predetermined direction and includes a plurality of switching elements and the inspection system selects two or more coils from the plurality of coils for each measurement of NMR signals, turns the switching elements connected to the selected coils ON, turns the switching elements connected to coils other than the selected coils OFF, changes a combination of two or more coils for each measurement of NMR signals, and changes the sensitivity distribution of the RF probe in the predetermined direction according to the Wavelet basis function for each measurement of NMR signals.
摘要翻译：在使用包括诸如静磁场，梯度磁场和RF磁场的磁场发生器的核磁共振的检查系统中，用于检测来自被检体的NMR信号的RF探针和用于操作检测信号的计算器通过RF探头，用于检测的RF探针包括沿预定方向布置的多个线圈，并且包括多个开关元件，并且检查系统从每个测量NMR信号中选择来自多个线圈的两个或更多个线圈，连接到所选择的线圈的开关元件接通，将与所选线圈以外的线圈相连的开关元件断开，对每个NMR信号的测量改变两个或更多个线圈的组合，并将RF探针的灵敏度分布改变为预定的根据每个NMR信号测量的小波基函数的方向。

15. 发明授权

US07868618B2 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US07868618B2
公开(公告)日：2011-01-11
申请号：US12308186
申请日：2007-06-12
申请人： Yo Taniguchi , Hisaaki Ochi
发明人： Yo Taniguchi , Hisaaki Ochi
IPC分类号： G01V3/00
CPC分类号： G01R33/5613 , A61B5/055 , G01R33/543 , G01R33/586
摘要： The MRI apparatus of the present invention executes a non-imaging mode 501 for obtaining a steady state of magnetization and an imaging mode 502 for measuring echoes for images. In the non-imaging mode 501 and the imaging mode 502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode 502 is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode 502 is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.
摘要翻译：本发明的MRI装置执行用于获得稳定的磁化状态的非成像模式501和用于测量图像的回波的成像模式502。在非成像模式501和成像模式502中，通过使用GrE型脉冲序列进行成像。在成像中，照射成像模式502中的核磁化的翻转角的RF脉冲在不大于由非成像模式502中使用的核磁化的翻转角确定的某个值的范围内变化的范围内。该特定值例如是在非成像模式中使用的核磁化的翻转角的最大值或由在非成像模式结束时使用的RF脉冲提供的翻转角。可以通过使用GrE型脉冲序列观察到的SAR，而不会降低图像对比度，从而可以降低对人体的影响。

16. 发明授权

US07701214B2 Magnetic resonance imaging apparatus 失效
标题翻译：磁共振成像装置
公开(公告)号：US07701214B2
公开(公告)日：2010-04-20
申请号：US11912763
申请日：2006-02-23
申请人： Shinji Kurokawa , Yo Taniguchi , Hisaaki Ochi , Shin-ichiro Umemura
发明人： Shinji Kurokawa , Yo Taniguchi , Hisaaki Ochi , Shin-ichiro Umemura
IPC分类号： G01V3/00
CPC分类号： G01R33/56375 , G01R33/56383
摘要： When a magnetic resonance signal is received more than once, while a table (transfer unit) is moved, a gradient magnetic field is applied in the table moving direction, and an application amount (intensity and application time) of the gradient magnetic field in the table moving direction is changed every acquisition of data. As for the encoding by the gradient magnetic field in the table moving direction, a series of phase encode is performed at different positions of an examination target, unlike a conventional phase encode. Therefore, the Fourier transform cannot be applied to the image reconstruction. Given this situation, a magnetization map of total FOV of the examination target is determined in such a manner that a sum of the square of an absolute value of a difference is minimized, the difference between a received signal and a signal calculated from the magnetization map set as a variable, and then, the reconstruction is performed. Even when a size of signal acquisition area in the table moving direction is narrow, the magnetic resonance imaging apparatus of the present invention is capable of taking an image of a wide field of view at high speed, by performing the imaging while the table is moved continuously.
摘要翻译：当多次接收到磁共振信号时，在移动台（传送单元）的同时，在台移动方向上施加梯度磁场，并且在梯形磁场的施加量（强度和施加时间）每次采集数据时，表移动方向都会发生变化。对于表移动方向的梯度磁场的编码，与现有的相位编码不同，在检查对象的不同位置进行一系列的相位编码。因此，傅里叶变换不能应用于图像重构。考虑到这种情况，检测对象的总FOV的磁化映射以如下方式来确定，使得差的绝对值的平方和之和最小化，接收信号与从磁化映射计算的信号之间的差设置为变量，然后进行重建。即使当表移动方向上的信号获取区域的尺寸窄时，本发明的磁共振成像装置也能够通过在桌子移动时进行成像而以高速拍摄宽视野的图像不断地

17. 发明申请

US20090251142A1 Magnetic Resonance Imaging Apparatus 有权
标题翻译：磁共振成像仪
公开(公告)号：US20090251142A1
公开(公告)日：2009-10-08
申请号：US12308186
申请日：2007-06-12
申请人： Yo Taniguchi , Hisaaki Ochi
发明人： Yo Taniguchi , Hisaaki Ochi
IPC分类号： G01R33/54 , G01R33/28
CPC分类号： G01R33/5613 , A61B5/055 , G01R33/543 , G01R33/586
摘要： The MRI apparatus of the present invention executes a non-imaging mode 501 for obtaining a steady state of magnetization and an imaging mode 502 for measuring echoes for images. In the non-imaging mode 501 and the imaging mode 502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode 502 is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode 502 is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.
摘要翻译：本发明的MRI装置执行用于获得稳定的磁化状态的非成像模式501和用于测量图像的回波的成像模式502。在非成像模式501和成像模式502中，通过使用GrE型脉冲序列进行成像。在成像中，照射成像模式502中的核磁化的翻转角的RF脉冲在不大于由非成像模式502中使用的核磁化的翻转角确定的某个值的范围内变化的范围内。该特定值例如是在非成像模式中使用的核磁化的翻转角的最大值或由在非成像模式结束时使用的RF脉冲提供的翻转角。可以通过使用GrE型脉冲序列观察到的SAR，而不会降低图像对比度，从而可以降低对人体的影响。

18. 发明申请

US20080009703A1 Magnetic resonance imaging system 有权
标题翻译：磁共振成像系统
公开(公告)号：US20080009703A1
公开(公告)日：2008-01-10
申请号：US11797878
申请日：2007-05-08
申请人： Yoshitaka Bito , Hisaaki Ochi , Yo Taniguchi , Satoshi Hirata , Toru Shirai
发明人： Yoshitaka Bito , Hisaaki Ochi , Yo Taniguchi , Satoshi Hirata , Toru Shirai
IPC分类号： A61B5/05
CPC分类号： G01R33/485 , G01R33/5608
摘要： A magnetic resonance imaging system capable of conducting spectroscopic imaging with an improved SNR without degrading the spatial resolution includes edge-preserving filter processing means for spectroscopic imaging. The edge-preserving filter processing means executes processing including the steps of calculating spectral similarity in spatial neighborhoods (spatially neighboring voxels) at each voxel in spectroscopic imaging data, calculating a spectral weight according to the spectral similarity, and conducting weighted smoothing for compounding spectra of spatial neighborhoods (spatially neighboring voxels) according to the spectral weight.
摘要翻译：能够在不降低空间分辨率的情况下以改善的SNR进行光谱成像的磁共振成像系统包括用于分光成像的边缘保留滤波处理装置。边缘保留滤波处理装置执行处理，其包括以下步骤：计算分光成像数据中的每个体素的空间邻域（空间相邻体素）中的频谱相似度，根据频谱相似度计算频谱权重，以及进行加权平滑化，根据光谱权重的空间邻域（空间相邻体素）。

19. 发明授权

US5789922A Inspecting method and apparatus based on nuclear magnetic resonance using burst wave as exciting high frequency pulse 失效
标题翻译：基于核磁共振的检测方法和装置，使用突发波作为激发高频脉冲
公开(公告)号：US5789922A
公开(公告)日：1998-08-04
申请号：US645478
申请日：1996-05-13
申请人： Hisaaki Ochi , Etsuji Yamamoto , Yo Taniguchi
发明人： Hisaaki Ochi , Etsuji Yamamoto , Yo Taniguchi
IPC分类号： G01R33/46 , A61B5/055 , G01R33/48 , G01R33/561
CPC分类号： G01R33/446 , G01R33/5615
摘要： In an inspecting method based on nuclear magnetic resonance, a burst wave having a plurality of sub-pulses frequency-modulated with a high frequency is generated, the burst wave is amplitude-modulated with at least a function which repeats polarity inversion, the amplitude-modulated burst wave is irradiated, as an exciting high frequency pulse, to an object to be inspected, and gradient magnetic fields are generated in predetermined pulse sequence to measure a nuclear magnetic resonance signal.
摘要翻译：在基于核磁共振的检查方法中，产生具有高频率频率调制的多个子脉冲的脉冲波，突发波被至少以重复极性反转的功能进行幅度调制，作为激励高频脉冲将调制脉冲波照射到要检查的物体，并且以预定脉冲序列产生梯度磁场以测量核磁共振信号。

20. 发明申请

US20090219020A1 MAGNETIC RESONANCE IMAGING APPARATUS 失效
标题翻译：磁共振成像装置
公开(公告)号：US20090219020A1
公开(公告)日：2009-09-03
申请号：US11912763
申请日：2006-02-23
申请人： Shinji Kurokawa , Yo Taniguchi , Hisaaki Ochi , Shin-ichiro Umemura
发明人： Shinji Kurokawa , Yo Taniguchi , Hisaaki Ochi , Shin-ichiro Umemura
IPC分类号： A61B5/055 , G01R33/20
CPC分类号： G01R33/56375 , G01R33/56383
摘要： When a magnetic resonance signal is received more than once, while a table (transfer unit) is moved, a gradient magnetic field is applied in the table moving direction, and an application amount (intensity and application time) of the gradient magnetic field in the table moving direction is changed every acquisition of data. As for the encoding by the gradient magnetic field in the table moving direction, a series of phase encode is performed at different positions of an examination target, unlike a conventional phase encode. Therefore, the Fourier transform cannot be applied to the image reconstruction. Given this situation, a magnetization map of total FOV of the examination target is determined in such a manner that a sum of the square of an absolute value of a difference is minimized, the difference between a received signal and a signal calculated from the magnetization map set as a variable, and then, the reconstruction is performed. Even when a size of signal acquisition area in the table moving direction is narrow, the magnetic resonance imaging apparatus of the present invention is capable of taking an image of a wide field of view at high speed, by performing the imaging while the table is moved continuously.
摘要翻译：当多次接收到磁共振信号时，在移动台（传送单元）的同时，在台移动方向上施加梯度磁场，并且在梯形磁场的施加量（强度和施加时间）每次采集数据时，表移动方向都会发生变化。对于表移动方向的梯度磁场的编码，与现有的相位编码不同，在检查对象的不同位置进行一系列的相位编码。因此，傅里叶变换不能应用于图像重构。考虑到这种情况，检测对象的总FOV的磁化映射以如下方式来确定，使得差的绝对值的平方和之和最小化，接收信号与从磁化映射计算的信号之间的差设置为变量，然后进行重建。即使当表移动方向上的信号获取区域的尺寸窄时，本发明的磁共振成像装置也能够通过在桌子移动时进行成像而以高速拍摄宽视野的图像不断地

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