公开(公告)号：US20130049753A1

公开(公告)日：2013-02-28

申请号：US13642573

申请日：2011-04-20

申请人： Yo Taniguchi ,  Yoshitaka Bito ,  Tetsuhiko Takahashi ,  Takenori Murase

发明人： Yo Taniguchi ,  Yoshitaka Bito ,  Tetsuhiko Takahashi ,  Takenori Murase

IPC分类号： G01R33/56

CPC分类号： A61B5/055 ,  A61B5/0042 ,  A61B2576/026 ,  G01R33/5608 ,  G01R33/5613 ,  G06T5/009 ,  G06T2207/10088

摘要： The present invention provides an image processing technique which enables various contrast control, by quantitatively handling a degree of phase enhancement in a contrast control as a post-processing of the image reconstruction. A complex operation is performed on each pixel value of a complex image obtained by an MRI, thereby generating an image with desired contrast. Intensity is controlled by increasing or decreasing the argument of the pixel value of each pixel by a constant amount, and the degree of phase enhancement is controlled by multiplying the phase (argument) of each pixel by a constant.

摘要翻译： 本发明提供一种图像处理技术，其能够通过定量地处理对比度控制中的相位增强程度来进行各种对比度控制，作为图像重构的后处理。 对通过MRI获得的复合图像的每个像素值执行复杂操作，从而生成具有期望对比度的图像。 通过将每个像素的像素值的自变量增加或减小恒定量来控制强度，并且通过将每个像素的相位（自变量）乘以常数来控制相位增强的程度。

公开(公告)号：US08030924B2

公开(公告)日：2011-10-04

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： G01V3/00

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）。

公开(公告)号：US07898255B2

公开(公告)日：2011-03-01

申请号：US11813011

申请日：2006-02-06

申请人： Hisaaki Ochi ,  Yo Taniguchi ,  Hiroyuki Takeuchi

发明人： Hisaaki Ochi ,  Yo Taniguchi ,  Hiroyuki Takeuchi

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  A61B5/055 ,  G01R33/34084 ,  G01R33/365 ,  G01R33/3657 ,  G01R33/5611

摘要： An MRI apparatus capable of selecting an optional direction as a phase encoding direction and achieving a preferable S/N, when an imaging time shortening technique is applied. A receiver coil, used as a receiver coil of a vertical magnetic field MRI apparatus, is a combination of a first coil (solenoid coil) forming a current loop around the outer circumference of a test object, second coils forming even-numbered current loops, and third coils forming odd-numbered current loops, in the direction intersecting the plane of the current loop of the first coil. The second coil and the third coil are arranged in such a manner that, as for the current loops in the array direction thereof, a position where a sensitivity of one coil is minimized approximately coincides with a position where the sensitivity of the other coil is maximized, whereby electromagnetic coupling is suppressed.

摘要翻译： 当应用成像时间缩短技术时，能够选择可选方向作为相位编码方向并获得优选的S / N的MRI装置。 用作垂直磁场MRI设备的接收器线圈的接收器线圈是形成围绕测试对象的外圆周的电流回路的第一线圈（螺线管线圈），形成偶数电流回路的第二线圈， 以及在与第一线圈的电流回路的平面相交的方向上形成奇数电流回路的第三线圈。 第二线圈和第三线圈以这样的方式布置，即对于其排列方向上的电流环，一个线圈的灵敏度最小化的位置近似与其他线圈的灵敏度最大化的位置一致 从而抑制电磁耦合。

公开(公告)号：US07626388B2

公开(公告)日：2009-12-01

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： G01V3/00

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。

公开(公告)号：US07622926B2

公开(公告)日：2009-11-24

申请号：US11721707

申请日：2005-12-22

申请人： Yo Taniguchi ,  Hisaaki Ochi ,  Masahiro Takizawa ,  Tetsuhiko Takahashi

发明人： Yo Taniguchi ,  Hisaaki Ochi ,  Masahiro Takizawa ,  Tetsuhiko Takahashi

IPC分类号： G01V3/00

CPC分类号： G01R33/56509 ,  G01R33/4824 ,  G01R33/561 ,  G01R33/5614 ,  G01R33/5616

摘要： Provided is a magnetic resonance imaging apparatus capable of highly precisely detecting and compensating body motions within a short processing time during radial scanning. The magnetic resonance imaging apparatus includes a control unit that applies radiofrequency magnetic fields and magnetic field gradients to a subject lying down in a static magnetic field and that detects magnetic resonance signals generated from the subject, and an arithmetic unit that handles the signals. The arithmetic unit performs subject's body motion detection in an image space, uses an image, which is reconstructed using the low-frequency portion of the k-space data of the image, as criterial data, produces templates by moving the criterial data in advance by predetermined magnitudes of rotations and predetermined magnitudes of translations, and uses the produced templates to perform the body motion detection.

摘要翻译： 提供一种磁共振成像装置，其能够在径向扫描期间在短的处理时间内高精度地检测和补偿身体运动。 磁共振成像装置包括：控制单元，其对位于静态磁场中的被摄体进行射频磁场和磁场梯度，并且检测从被检体产生的磁共振信号;以及运算单元，其处理该信号。 算术单元在图像空间中进行被摄体的身体运动检测，使用利用图像的k空间数据的低频部分重构的图像作为标准数据，通过预先移动标准数据来生成模板 预定的旋转角度和预定的平移量，并且使用所产生的模板来执行身体运动检测。

公开(公告)号：US20090201020A1

公开(公告)日：2009-08-13

申请号：US12423431

申请日：2009-04-14

申请人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01R33/48

CPC分类号： A61B5/411 ,  A61B5/0037 ,  A61B5/055 ,  A61B5/415 ,  A61B5/416 ,  A61B5/418 ,  A61B5/7257 ,  G01R33/389 ,  G01R33/485

摘要： The present invention provides a magnetic resonance imaging system capable of performing spectrum measurement even when a magnetic resonant frequency changes during MRS measurement. A time-varying rate of a water magnetic resonant frequency is measured in advance before the MRS measurement. The amount of change in water magnetic resonant frequency during the MRS measurement is predicted from the measured time-varying rate. With the predicted value as the reference, a transmission frequency of an RF magnetic field irradiated in a signal suppression pulse sequence, a transmission frequency of an RF magnetic field for excitation and inversion and a received frequency at the detection of a magnetic resonance signal in a sequence of the MRS measurement are respectively set. A high-precision spectrum measurement is hence enabled.

摘要翻译： 本发明提供一种磁共振成像系统，即使MRS测量期间磁共振频率发生变化，也能进行光谱测量。 在MRS测量之前，预先测量水磁共振频率的时变速率。 MRS测量期间水磁共振频率的变化量根据测量的时变速率预测。 以预测值为参考，在信号抑制脉冲序列中照射的RF磁场的传输频率，用于激励和反转的RF磁场的传输频率和在检测磁共振信号中的接收频率 分别设置MRS测量的顺序。 因此，能够进行高精度的频谱测量。

公开(公告)号：US07518362B2

公开(公告)日：2009-04-14

申请号：US10562643

申请日：2004-06-02

申请人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Satoshi Hirata ,  Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01V3/00

CPC分类号： A61B5/411 ,  A61B5/0037 ,  A61B5/055 ,  A61B5/415 ,  A61B5/416 ,  A61B5/418 ,  A61B5/7257 ,  G01R33/389 ,  G01R33/485

摘要： The present invention provides a magnetic resonance imaging system capable of performing spectrum measurement even when a magnetic resonant frequency changes during MRS measurement. A time-varying rate of a water magnetic resonant frequency is measured in advance before the MRS measurement. The amount of change in water magnetic resonant frequency during the MRS measurement is predicted from the measured time-varying rate. With the predicted value as the reference, a transmission frequency of an RF magnetic field irradiated in a signal suppression pulse sequence, a transmission frequency of an RF magnetic field for excitation and inversion and a received frequency at the detection of a magnetic resonance signal in a sequence of the MRS measurement are respectively set. A high-precision spectrum measurement is hence enabled.

摘要翻译： 本发明提供一种磁共振成像系统，即使MRS测量期间磁共振频率发生变化，也能进行光谱测量。 在MRS测量之前，预先测量水磁共振频率的时变速率。 MRS测量期间水磁共振频率的变化量根据测量的时变速率预测。 以预测值为参考，在信号抑制脉冲序列中照射的RF磁场的传输频率，用于激励和反转的RF磁场的传输频率和在检测磁共振信号中的接收频率 分别设置MRS测量的顺序。 因此，能够进行高精度的频谱测量。

公开(公告)号：US20090030302A1

公开(公告)日：2009-01-29

申请号：US11917689

申请日：2006-06-15

申请人： Yo Taniguchi ,  Hisaaki Ochi ,  Tetsuhiko Takahashi ,  Masahiro Takizawa

发明人： Yo Taniguchi ,  Hisaaki Ochi ,  Tetsuhiko Takahashi ,  Masahiro Takizawa

IPC分类号： A61B5/055

CPC分类号： G01R33/56375 ,  A61B5/055 ,  A61B6/5241 ,  G01R33/5608 ,  G01R33/56383 ,  G06T3/0075

摘要： The magnetic resonance imaging apparatus includes a control unit for controlling a pulse sequence that applies an RF magnetic field and a magnetic field gradient to a subject placed in a static magnetic field and detects a magnetic resonance signal generated from the subject, and a calculation unit for processing the signal, and the control unit performs the process including the steps of; (1) obtaining first images at different positions in a first direction, (2) obtaining images after the first images are subjected to correction of brightness distortion, (3) obtaining images after the images as to which the brightness distortion has been corrected are further subjected to correction of positional distortion, and (4) synthesizing by a weighting calculation, overlapping areas of the images, after the positional distortion thereof has been corrected. According to this magnetic resonance imaging apparatus, the positional distortion and the brightness distortion can be corrected upon connecting the images, in the multi-station imaging.

摘要翻译： 磁共振成像装置包括：控制单元，用于控制对放置在静态磁场中的被摄体施加RF磁场和磁场梯度的脉冲序列，并检测从对象产生的磁共振信号;以及计算单元， 处理信号，并且控制单元执行包括以下步骤的处理： （1）在第一方向上获取不同位置的第一图像，（2）在第一图像经受亮度失真校正之后获得图像，（3）获得图像之后的亮度失真已被校正的图像进一步获得 进行位置失真的校正，（4）通过加权计算合成图像的重叠区域，在其位置失真被校正之后。 根据该磁共振成像装置，在多台成像中，可以在连接图像时校正位置失真和亮度失真。

公开(公告)号：US20080221430A1

公开(公告)日：2008-09-11

申请号：US12030893

申请日：2008-02-14

申请人： Hisaaki OCHI ,  Yo Taniguchi ,  Yoshihisa Soutome ,  Yoshitaka Bito

发明人： Hisaaki OCHI ,  Yo Taniguchi ,  Yoshihisa Soutome ,  Yoshitaka Bito

IPC分类号： A61B5/055

CPC分类号： G01R33/5601 ,  G01R33/54 ,  G01R33/5616 ,  G01R33/5617

摘要： A magnetic resonance imaging (MRI) apparatus for high-speed and high-accuracy detection of cell positions labeled with magnetic nanoparticles. A transmitter coil is controlled to generate amplitude-modulated burst RF pulses as excitation RF pulses whose amplitude is modulated by a function that repeatedly inverts the polarity of multiple high-frequency magnetic field sub-pulses separated time-wise and changes the amplitude at each polarity inversion, moreover the time interval of the amplitude-modulated burst RF pulse is set to effectively 1/(2×a first frequency), and the transmitter coil controlled so the carrier frequency of the amplitude-modulated burst RF pulse is set to a second frequency shifted substantially from the first frequency of the magnetic resonance frequency of the proton at the magnetic field strength in the MRI apparatus. The first frequency is here determined based on magnetic nanoparticle information loaded from the magnetic nanoparticle information storage unit and the magnetic resonance frequency of the proton in the static magnetic field. The MRI apparatus can in this way detect the position of cells labeled with magnetic nanoparticles, with high-speed and high accuracy.

摘要翻译： 一种磁共振成像（MRI）装置，用于高速和高精度检测用磁性纳米颗粒标记的细胞位置。 发射器线圈被控制以产生幅度调制的突发RF脉冲作为激励RF脉冲，其幅度通过重复地反转时间间隔分离的多个高频磁场子脉冲的极性并改变每个极性的振幅的函数来调制 此外，调幅脉冲串RF脉冲的时间间隔被有效地设置为1 /（2×a第一频率），并且被控制的发射机线圈被调制的调幅脉冲串RF脉冲的载波频率设置为第二频移 基本上从MRI装置中的磁场强度的质子的磁共振频率的第一频率开始。 这里基于从磁性纳米颗粒信息存储单元加载的磁性纳米颗粒信息和静态磁场中质子的磁共振频率来确定第一频率。 MRI装置可以以这种方式以高速和高精度检测用磁性纳米颗粒标记的细胞的位置。