公开(公告)号：US06222365B1

公开(公告)日：2001-04-24

申请号：US09155245

申请日：1998-09-24

申请人： Yo Taniguchi ,  Hisaaki Ochi ,  Kenichi Okajima ,  Satoshi Hirata

发明人： Yo Taniguchi ,  Hisaaki Ochi ,  Kenichi Okajima ,  Satoshi Hirata

IPC分类号： G01V300

CPC分类号： G01R33/482 ,  G01R33/54

摘要： In a magnetic resonance imaging apparatus including a pulse sequence control unit for controlling a pulse sequence to acquire echoes while both a radio frequency magnetic field and a gradient magnetic field are applied to an object under examination present in a static magnetic field; and an image reconstructing unit for reconstructing an image based upon the acquired echoes, the pulse sequence control unit is comprised of a spatial resolution control unit for setting spatial resolution A along a readout gradient magnetic field direction of the reconstructed image; and a gradient magnetic field strength control unit for applying such a readout gradient magnetic field that spatial resolution B determined by a strength of the readout gradient magnetic field and a sampling period becomes coarser than the spatial resolution A. The image reconstructing unit reconstructs an image while a minimum unit of the spatial resolution A is set as a width of one pixel of a reconstructed image along a readout direction.

摘要翻译： 在包括脉冲序列控制单元的磁共振成像设备中，所述脉冲序列控制单元用于控制脉冲序列以获取回波，同时将射频磁场和梯度磁场施加到存在于静态磁场中的被检查物体; 所述脉冲序列控制单元包括用于沿着所述重建图像的读出梯度磁场方向设定空间分辨率A的空间分辨率控制单元，所述图像重建单元用于基于所获取的回波重建图像。 以及梯度磁场强度控制单元，用于施加由读出梯度磁场的强度和采样周期确定的空间分辨率B变得比空间分辨率A更粗糙的读出梯度磁场。图像重建单元重建图像，同时 将空间分辨率A的最小单位设置为沿着读出方向的重建图像的一个像素的宽度。

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。

公开(公告)号：US07852076B2

公开(公告)日：2010-12-14

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： 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：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）。

公开(公告)号：US20060255802A1

公开(公告)日：2006-11-16

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：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：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：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。

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。