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。

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。

公开(公告)号：US09389289B2

公开(公告)日：2016-07-12

申请号：US13881739

申请日：2011-10-26

申请人： Toru Shirai ,  Yoshitaka Bito ,  Satoshi Hirata ,  Yoshihisa Soutome ,  Yo Taniguchi

发明人： Toru Shirai ,  Yoshitaka Bito ,  Satoshi Hirata ,  Yoshihisa Soutome ,  Yo Taniguchi

IPC分类号： G01R33/36 ,  A61B5/055 ,  G01R33/465 ,  G01R33/48 ,  G01R33/485 ,  G01R33/561

CPC分类号： G01R33/3621 ,  A61B5/055 ,  G01R33/465 ,  G01R33/4828 ,  G01R33/485 ,  G01R33/5611

摘要： Images of two or more kinds of substances showing different chemical shifts, such as water image and metabolite image, are obtained without extending measurement time. For example, images of two or more kinds of desired substances showing different chemical shifts, such as water image and metabolite image, are obtained by one time of execution of an imaging sequence. In this execution, a pre-pulse is applied so that signals of the substances to be separated shift on the image, and magnetic resonance signals are received with receiver RF coils in a number not smaller than the number of types of the substances to be separated. An image reconstructed from the magnetic resonance signals is separated into images of the individual substances using sensitivity maps of the receiver RF coils. Then, correction is performed for returning the shifted image to the original position. Further, residual signals induced by errors generated in the measurement and the separation processing are eliminated by using spectroscopic images obtained after the separation.

摘要翻译： 在不延长测量时间的情况下，获得显示不同化学位移的两种或更多种物质的图像，例如水图像和代谢物图像。 例如，通过一次执行成像序列，可以获得显示不同化学位移的两种或更多种所需物质的图像，例如水图像和代谢物图像。 在该执行中，施加预脉冲，使得要分离的物质的信号在图像上移动，并且用接收器RF线圈​​接收不少于待分离物质的数量的数量的磁共振信号 。 使用接收机RF线圈的灵敏度图将从磁共振信号重构的图像分离成各个物质的图像。 然后，执行用于将移动的图像返回到原始位置的校正。 此外，通过使用分离后获得的分光图像来消除由测量和分离处理中产生的误差引起的残留信号。

公开(公告)号：US20140191756A1

公开(公告)日：2014-07-10

申请号：US14240441

申请日：2012-07-27

申请人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Yoshihisa Soutome

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Yoshihisa Soutome

IPC分类号： G01R33/483

CPC分类号： G01R33/483 ,  A61B5/0037 ,  A61B5/0042 ,  A61B5/055 ,  G01R33/543

摘要： A technique in a medical imaging apparatus being capable of setting any plane in three-dimensional space as an imaging slice is provided, allowing an automatically-set imaging slice to be configured to suit user's preferences, and determine a position of the imaging slice being configured, with respect to an imaging target subject automatically with a high degree of accuracy. Reference information for specifying the imaging slice, set by the user for each imaging site, is associated with the anatomical feature of the imaging site, so as to generate an imaging slice parameter. Upon actual imaging, the imaging slice parameter and the anatomical feature of the imaging target subject obtained by scout imaging are used to determine the imaging slice position of the imaging target subject.

摘要翻译： 提供能够将三维空间中的任何平面设置为成像切片的医疗成像设备中的技术，允许自动设置的成像切片被配置为适合用户的偏好，并且确定被配置的成像切片的位置 ，相对于成像目标物体自动地以高精度。 用于指定用于每个成像部位的用户的成像切片的参考信息与成像部位的解剖特征相关联，以便生成成像切片参数。 在实际成像时，使用通过侦察成像获得的成像目标对象的成像切片参数和解剖特征来确定成像目标对象的成像切片位置。

公开(公告)号：US08693760B2

公开(公告)日：2014-04-08

申请号：US13380201

申请日：2010-06-22

申请人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito

IPC分类号： G06K9/00

CPC分类号： A61B5/055 ,  A61B5/0037 ,  A61B5/0042 ,  A61B5/4528 ,  A61B5/4533 ,  A61B2576/026 ,  G01R33/4833 ,  G01R33/543 ,  G01R33/546

摘要： There is provided a technique for, in a medical imaging apparatus enabling imaging of an arbitrary plane in a three-dimensional space, enabling automatic calculation of a slice position and automatic calculation of an extracting slice in MPR, without prolonging examination time. Two-dimensional scout scan similar to that used for manual setting of a slice position is performed, and the obtained scout images are processed to calculate a recommended slice position. Algorithms for the processing and various image processing procedures used for the processing are stored beforehand for every type of imaging region and every type of examination.

摘要翻译： 本发明提供一种技术，在能够对三维空间中的任意平面进行成像的医疗成像装置中，能够自动计算切片位置并自动计算MPR中的提取切片，而不延长检查时间。 执行类似于用于手动设置切片位置的二维侦察扫描，并且对所获得的侦察图像进行处理以计算推荐切片位置。 用于处理的算法和用于处理的各种图像处理程序预先存储在每种类型的成像区域和每种类型的检查中。

公开(公告)号：US20130314090A1

公开(公告)日：2013-11-28

申请号：US13984537

申请日：2012-01-19

申请人： Yo Taniguchi ,  Suguru Yokosawa ,  Yoshitaka Bito

发明人： Yo Taniguchi ,  Suguru Yokosawa ,  Yoshitaka Bito

IPC分类号： G01R33/56

CPC分类号： G01R33/56 ,  A61B5/055 ,  G01R33/5614 ,  G01R33/5616 ,  G01R33/56554 ,  G01R33/56572

摘要： In order to improve image quality, a technique for obtaining information for eliminating distortions of the k-space in the readout direction and the phase encoding direction caused by the waveform distortion of the gradient magnetic field pulse is provided. A pulse sequence for the main scan is used to repeatedly measure echoes with changing the time integral value of the dephasing pulse for the readout gradient magnetic field. In the above measurement, the phase encoding pulse is not made zero, but two-dimensional data are measured in the same manner as that of the main scan. By using the measured two-dimensional data, correction information for eliminating distortions of the k-space in the readout direction and the phase encoding direction caused by the waveform distortion of the gradient magnetic field pulse is calculated in each of the readout direction and the phase encoding direction.

摘要翻译： 为了提高图像质量，提供了一种用于获得用于消除由梯度磁场脉冲的波形失真引起的读出方向和相位编码方向上的k空间的失真的信息的技术。 用于主扫描的脉冲序列用于通过改变读出梯度磁场的去相位脉冲的时间积分值来重复测量回波。 在上述测量中，相位编码脉冲不为零，而是以与主扫描相同的方式测量二维数据。 通过使用所测量的二维数据，在每个读出方向和相位上计算用于消除由梯度磁场脉冲的波形失真引起的读出方向上的k空间的失真和相位编码方向的校正信息 编码方向。

公开(公告)号：US08339136B2

公开(公告)日：2012-12-25

申请号：US12599534

申请日：2008-04-28

申请人： Yo Taniguchi ,  Shinji Kurokawa ,  Suguru Yokosawa ,  Yoshitaka Bito

发明人： Yo Taniguchi ,  Shinji Kurokawa ,  Suguru Yokosawa ,  Yoshitaka Bito

IPC分类号： G01V3/00

CPC分类号： A61B5/0555 ,  A61B5/7207 ,  A61B5/7257 ,  G01R33/56375 ,  G01R33/56383 ,  G01R33/56563

摘要： In the continuous moving table imaging, an image is reconstructed with suppressed artifacts even in imaging under inhomogeneity of static magnetic field.In a magnetic resonance imaging apparatus, signals are measured with moving a table to obtain multiple data sets, and inverse Fourier transform of each data set is carried out in the read-out direction to obtain hybrid data. One-dimensional data are extracted from each hybrid data at a border with respect to the adjacent hybrid data, and correction values for corrections of discontinuity of signal intensity and phase at a border of hybrid data are obtained by using the one-dimensional data. Data obtained by inverse Fourier transform of each hybrid data are corrected by using the correction values, and an image showing continuity for signal intensity and phase is eventually obtained.

摘要翻译： 在连续移动台成像中，即使在静态磁场不均匀的成像下，也可以用抑制伪影重建图像。 在磁共振成像装置中，通过移动表来测量信号以获得多个数据集，并且在读出方向上执行每个数据集的傅立叶逆变换以获得混合数据。 从相对于相邻混合数据的边界处的每个混合数据中提取一维数据，并且通过使用一维数据获得混合数据边界处的信号强度和相位不连续性的校正值。 通过使用校正值校正每个混合数据的逆傅里叶变换获得的数据，并且最终获得表示信号强度和相位的连续性的图像。

公开(公告)号：US20100272336A1

公开(公告)日：2010-10-28

申请号：US12599534

申请日：2008-04-28

申请人： Yo Taniguchi ,  Shinji Kurokawa ,  Suguru Yokosawa ,  Yoshitaka Bito

发明人： Yo Taniguchi ,  Shinji Kurokawa ,  Suguru Yokosawa ,  Yoshitaka Bito

IPC分类号： G06K9/00

CPC分类号： A61B5/0555 ,  A61B5/7207 ,  A61B5/7257 ,  G01R33/56375 ,  G01R33/56383 ,  G01R33/56563

摘要： In the continuous moving table imaging, an image is reconstructed with suppressed artifacts even in imaging under inhomogeneity of static magnetic field.In a magnetic resonance imaging apparatus, signals are measured with moving a table to obtain multiple data sets, and inverse Fourier transform of each data set is carried out in the read-out direction to obtain hybrid data. One-dimensional data are extracted from each hybrid data at a border with respect to the adjacent hybrid data, and correction values for corrections of discontinuity of signal intensity and phase at a border of hybrid data are obtained by using the one-dimensional data. Data obtained by inverse Fourier transform of each hybrid data are corrected by using the correction values, and an image showing continuity for signal intensity and phase is eventually obtained.

摘要翻译： 在连续移动台成像中，即使在静态磁场不均匀的成像下，也可以用抑制伪影重建图像。 在磁共振成像装置中，通过移动表来测量信号以获得多个数据集，并且在读出方向上执行每个数据集的傅立叶逆变换以获得混合数据。 从相对于相邻混合数据的边界处的每个混合数据中提取一维数据，并且通过使用一维数据获得混合数据边界处的信号强度和相位不连续性的校正值。 通过使用校正值校正每个混合数据的逆傅里叶变换获得的数据，并且最终获得表示信号强度和相位的连续性的图像。

公开(公告)号：US20100097062A1

公开(公告)日：2010-04-22

申请号：US12519197

申请日：2007-06-29

申请人： Toru Shirai ,  Yoshitaka Bito ,  Yo Taniguchi ,  Satoshi Hirata

发明人： Toru Shirai ,  Yoshitaka Bito ,  Yo Taniguchi ,  Satoshi Hirata

IPC分类号： G01V3/14

CPC分类号： G01R33/485 ,  G01R33/483 ,  G01R33/5602 ,  G01R33/5607

摘要： A method for obtaining the most appropriate amplitude of signal suppression pulse, which suppresses unnecessary signals from the substance not subjected to measurement, highly accurately, swiftly and stably, and an MRI apparatus that enables the optimization are provided.A pulse amplitude adjusting means equipped in the MRI apparatus acquires signals while changing the amplitude of signal suppression pulse and calculates signal absolute values and phase values, and computes reference signals, which are polarized signal absolute values, based on the changes in signal phase values. This reference signals are subjected to polynomial fitting. A value which makes this fitting curve is 0 or closes to 0 is set as the optimal pulse amplitude.

摘要翻译： 提供了一种用于获得信号抑制脉冲的最适当振幅的方法，其能够高度准确，快速且稳定地抑制不被测量的物质的不必要的信号，并且提供能够进行优化的MRI装置。 装备在MRI装置中的脉冲幅度调整装置在改变信号抑制脉冲的振幅的同时获取信号，并且计算信号绝对值和相位值，并且基于信号相位值的变化来计算作为极化信号绝对值的参考信号。 该参考信号经过多项式拟合。 使该拟合曲线为0或接近0的值被设定为最佳脉冲幅度。

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