公开(公告)号：US6043650A

公开(公告)日：2000-03-28

申请号：US10596

申请日：1998-01-22

申请人： Yo Taniguchi ,  Kenichi Okajima ,  Shinji Kawasaki

发明人： Yo Taniguchi ,  Kenichi Okajima ,  Shinji Kawasaki

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/567 ,  G01V3/00

CPC分类号： G01R33/5673

摘要： There are provided body movement measuring means for measuring the movement of an object of inspection and control means for controlling at least means for applying a gradient magnetic field and means for applying a high frequency magnetic field. The control means performs a sequence for measuring an echo by applying a phase-encoding gradient magnetic field quantity a plurality of times with the same phase-encoding gradient magnetic field quantity and repeatedly executes the sequence while varying the phase-encoding gradient magnetic field quantity. When the phase-encoding gradient magnetic field quantity is small, the number of execution times of the sequence executed with the same phase-encoding gradient magnetic field quantity in a case where the phase-encoding gradient magnetic field quantity is small is set to be larger than a case where the phase encoding gradient magnetic field quantity is large to reduce the probability of omission occurrence of echo measurement in the small phase-encoding magnetic field which exerts a large influence on an image, thereby suppressing the occurrence of an artifact.

摘要翻译： 提供了用于测量用于控制至少用于施加梯度磁场的装置的检查和控制装置的物体的运动的身体运动测量装置和用于施加高频磁场的装置。 控制装置通过以相同的相位编码梯度磁场量多次施加相位编码梯度磁场量来执行用于测量回波的序列，并且在改变相位编码梯度磁场量的同时重复执行该序列。 当相位编码梯度磁场量小时，在相位编码梯度磁场量较小的情况下，以相同相位编码倾斜磁场量执行的序列的执行次数被设定为较大 比相位编码梯度磁场量大的情况，以减小对图像产生较大影响的小相位编码磁场中忽略出现回波测量的可能性，从而抑制伪像的发生。

公开(公告)号：US5684398A

公开(公告)日：1997-11-04

申请号：US297565

申请日：1994-09-01

申请人： Kenji Takiguchi ,  Yo Taniguchi ,  Etsuji Yamamoto ,  Shigeru Watanabe ,  Katsunori Suzuki ,  Ryuzaburo Takeda ,  Shoji Kondo

发明人： Kenji Takiguchi ,  Yo Taniguchi ,  Etsuji Yamamoto ,  Shigeru Watanabe ,  Katsunori Suzuki ,  Ryuzaburo Takeda ,  Shoji Kondo

IPC分类号： G01R33/563 ,  A61B5/0265

CPC分类号： G01R33/56308

摘要： A bolus of magnetized blood is formed by at least two radio frequency magnetic fields, and readout gradient magnetic fields are repeatedly applied at a proportion of 1:-2:1 along a blood vessel so as to continuously obtain a first echo signal whose phase change due to velocity is corrected, from the moving bolus. This first echo signal provides velocity information on the blood stream. The sequence of the readout gradient magnetic fields is repeatedly applied at a proportion of (.sqroot.2-1):-2:2:-(.sqroot.2-1) so as to continuously obtain a second echo signal whose phase change due to velocity and acceleration is corrected, from the moving bolus. Acceleration information of the blood stream is extracted by calculating the difference between the first echo signal and the second echo signal. The velocity information and/or the acceleration information is displayed in superposition with a specific blood vessel of an angiogram shot in advance.

摘要翻译： 通过至少两个射频磁场形成大量的磁化血液，沿着血管以1：-2：1的比例反复施加读出梯度磁场，以便连续获得相位变化的第一回波信号 由于速度被校正，从移动推注。 该第一回波信号提供关于血流的速度信息。 读出梯度磁场的顺序以（2ROOT + E，rad 2 + EE -1）： - 2：2： - （2ROOT + E，rad 2 + EE -1）的比例重复施加，以连续 从移动推注获得由于速度和加速度而导致的相位变化的第二回波信号。 通过计算第一回波信号和第二回波信号之间的差来提取血流的加速度信息。 速度信息和/或加速度信息与预先拍摄的血管造影的特定血管重叠地显示。

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：US20070038076A1

公开(公告)日：2007-02-15

申请号：US11356010

申请日：2006-02-17

申请人： Akiko Osada ,  Yukari Yamamoto ,  Yo Taniguchi

发明人： Akiko Osada ,  Yukari Yamamoto ,  Yo Taniguchi

IPC分类号： A61B5/05

CPC分类号： G01R33/5601 ,  G01R33/282

摘要： The invention provides an MRI apparatus capable of using a static magnetic filed magnet provided therein as a magnet for polarization, and performing DNP therein without changing a construction of a conventional MRI apparatus. A DNP means placed in the MRI apparatus includes a sample tube, cooling units for cooling and solidifying a sample in the sample tube, a microwave irradiating unit, and a metal tube. At least a member placed near an imaging space (five-gauss line) of the MRI apparatus is made of a nonmagnetic material, and a static magnetic field generating magnet of the MRI apparatus is used as a magnetic field applying means for applying a magnetic field to the sample for polarization. A contrast agent generated by the DNP can be immediately injected into a patient for imaging, so as to provide an image with high S/N.

摘要翻译： 本发明提供一种MRI设备，其能够使用其中提供的静磁磁体作为磁极用于极化，并且在不改变常规MRI设备的结构的情况下执行DNP。 放置在MRI装置中的DNP装置包括样品管，用于冷却固化样品管中的样品的冷却单元，微波照射单元和金属管。 位于MRI装置的成像空间（五高斯线）附近的至少一个构件由非磁性材料制成，MRI装置的静磁场产生磁体用作施加磁场的磁场施加装置 到样品进行极化。 由DNP产生的造影剂可以立即注射到患者进行成像，以提供高S / N的图像。