公开(公告)号：US07635978B2

公开(公告)日：2009-12-22

申请号：US11918082

申请日：2006-03-22

申请人： Tetsuhiko Takahashi ,  Yumiko Yatsui ,  Koji Kajiyama ,  Hideki Kumai

发明人： Tetsuhiko Takahashi ,  Yumiko Yatsui ,  Koji Kajiyama ,  Hideki Kumai

IPC分类号： G01V3/00

CPC分类号： G01R33/56375 ,  G01R33/56383

摘要： A control means controls an imaging means for taking an image of a test object by a magnetic resonance, the test object being placed in an imaging space, and a transfer means that moves the test object, and on the basis of a difference (moving distance) between a position of the transfer means at the time of receiving a command of pausing the imaging and a position of the transfer means at the time of resuming the imaging, the control means controls the position of the transfer means or the position for imaging at the time of resuming, in such a manner that missing of data 503 caused by the difference can be compensated. With this configuration, it is possible to provide an MRI apparatus that is provided with an imaging pause function, and even when the pause function is activated, there is data consistency between the data before the pausing and the data after the resuming, thereby obtaining a high quality image.

摘要翻译： 控制装置控制用于通过磁共振，测试对象被放置在成像空间中的测试对象的图像和移动测试对象的传送装置，并且基于差异（移动距离 ）在接收到暂停成像的命令时的传送装置的位置与恢复成像时的传送装置的位置之间，控制装置控制传送装置的位置或成像的位置 以这种方式恢复的时间，可以补偿由差异引起的数据503的丢失。 通过该结构，能够提供具有成像暂停功能的MRI装置，即使暂停功能被激活，暂停前的数据与恢复后的数据之间存在数据一致性，从而获得 高质量的图像。

公开(公告)号：US20090066328A1

公开(公告)日：2009-03-12

申请号：US11918082

申请日：2006-03-22

申请人： Tetsuhiko Takahashi ,  Yumiko Yatsui ,  Koji Kajiyama ,  Hideki Kumai

发明人： Tetsuhiko Takahashi ,  Yumiko Yatsui ,  Koji Kajiyama ,  Hideki Kumai

IPC分类号： G01R33/48

CPC分类号： G01R33/56375 ,  G01R33/56383

摘要： A control means controls an imaging means for taking an image of a test object by a magnetic resonance, the test object being placed in an imaging space, and a transfer means that moves the test object, and on the basis of a difference (moving distance) between a position of the transfer means at the time of receiving a command of pausing the imaging and a position of the transfer means at the time of resuming the imaging, the control means controls the position of the transfer means or the position for imaging at the time of resuming, in such a manner that missing of data 503 caused by the difference can be compensated. With this configuration, it is possible to provide an MRI apparatus that is provided with an imaging pause function, and even when the pause function is activated, there is data consistency between the data before the pausing and the data after the resuming, thereby obtaining a high quality image.

摘要翻译： 控制装置控制用于通过磁共振，测试对象被放置在成像空间中的测试对象的图像和移动测试对象的传送装置，并且基于差异（移动距离 ）在接收到暂停成像的命令时的传送装置的位置与恢复成像时的传送装置的位置之间，控制装置控制传送装置的位置或成像的位置 以这种方式恢复的时间，可以补偿由差异引起的数据503的丢失。 通过该结构，能够提供具有成像暂停功能的MRI装置，即使暂停功能被激活，暂停前的数据与恢复后的数据之间存在数据一致性，从而获得 高质量的图像。

公开(公告)号：US20080111546A1

公开(公告)日：2008-05-15

申请号：US11666599

申请日：2005-10-27

申请人： Tetsuhiko Takahashi ,  Tomohiro Goto

发明人： Tetsuhiko Takahashi ,  Tomohiro Goto

IPC分类号： A61B5/055 ,  G01V3/00

CPC分类号： G01R33/56375 ,  A61B5/055 ,  A61B5/7285 ,  G01R33/4833 ,  G01R33/5635 ,  G01R33/56383 ,  G01R33/5673 ,  G01R33/5676

摘要： There is provided an MRI apparatus that is capable of imaging ON/OFF in response to a biological gating signal and changing conditions for imaging, even while the moving bed imaging is performed, and further reducing a load on a subject to be examined, which is caused by fluctuations in the bed moving velocity. A controller that controls a bed to transport the examined subject in a static magnetic field and a unit to apply an RF magnetic field and a gradient magnetic field for imaging configures settings so that the bed moving velocity is kept constant considering an entire imaging time, and further controls the magnetic applying unit for applying the RF magnetic field and the gradient magnetic field so that a moving velocity of the FOV (imaging area) in the subject coordinate system is made different from the bed moving velocity.

摘要翻译： 提供了一种MRI装置，其能够响应于生物门控信号和变化的成像条件来对ON / OFF进行成像，即使在执行移动床成像的同时，进一步降低被检查对象的负荷，即 由床移动速度波动引起的。 一个控制器，其控制床以静态磁场传送被检查的被摄体，并且单元用于施加用于成像的RF磁场和梯度磁场，构成设置，使得考虑到整个成像时间，床移动速度保持不变，以及 进一步控制用于施加RF磁场和梯度磁场的磁性施加单元，使得对象坐标系中的FOV（成像区域）的移动速度与床移动速度不同。

公开(公告)号：US07196518B2

公开(公告)日：2007-03-27

申请号：US10344430

申请日：2001-08-13

申请人： Yumiko Yatsui ,  Tetsuhiko Takahashi

发明人： Yumiko Yatsui ,  Tetsuhiko Takahashi

IPC分类号： G01R33/20 ,  G01V3/00 ,  A61B5/055

CPC分类号： G01R33/60 ,  A61B5/055 ,  A61B5/4872 ,  G01R33/4828 ,  G01R33/56563

摘要： A magnetic resonance imaging method for fully automatically forming a water/fat separated image by calculation after acquiring data on images of different echo times, wherein the unwrapping of a phase map showing the distribution of the phase rotation due to the inhomogeneous static magnetic field is repeated so as to determine the distribution of the inhomogeneous static magnetic field by using an index used for judging whether or not the unwrapping is properly being performed, and wherein during the formation of a water/fat separated image with correction of the static magnetic field, the unwrapping is automatically and properly performed in correcting the static magnetic field, and the water/fat images are automatically discriminated.

摘要翻译： 一种磁共振成像方法，用于在获取关于不同回波时间的图像的数据之后通过计算完全自动形成水/脂肪分离图像，其中重复显示由于不均匀静磁场引起的相位旋转分布的相位图的展开 以便通过使用用于判断是否正在进行展开的指标来确定非均匀静磁场的分布，并且其中在形成具有静态磁场校正的水/脂肪分离图像时， 在对静态磁场进行校正时自动适当地进行解包，自动识别水/脂肪图像。

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：US07061242B2

公开(公告)日：2006-06-13

申请号：US10432166

申请日：2001-11-20

申请人： Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Ken'ichi Okajima

发明人： Hisaaki Ochi ,  Yo Taniguchi ,  Tetsuhiko Takahashi ,  Ken'ichi Okajima

IPC分类号： G01V3/00

CPC分类号： G01R33/3415 ,  A61B5/055

摘要： To provide a diagnostic apparatus utilizing nuclear magnetic resonance suitable for interventional MRI which is not limited as to selection of an imaging section and an phase-encoding axis, the reception coil thereof includes three loop coils arranged so as to surround an object to be examined and to be within a plane including a line segment parallel to a static magnetic field direction, and two surface coils arranged in the vicinity of the surface of the object within a plane including a line segment perpendicular to the static magnetic field direction. In the reception coil, two or more sub-coils have nonuniform sensitivity profiles along an arbitrary axis. Therefore, the reception coil configured to have sensitivity throughout the imaging areas can be realized.

摘要翻译： 为了提供利用适于介入MRI的核磁共振的诊断装​​置，其不限于成像部分和相位编码轴的选择，其接收线圈包括布置成围绕被检查物体的三个环形线圈， 在包括平行于静磁场方向的线段的平面内，以及布置在物体表面附近的包括垂直于静磁场方向的线段的平面内的两个表面线圈。 在接收线圈中，两个或更多个子线圈沿任意轴线具有不均匀的灵敏度分布。 因此，可以实现在整个成像区域具有灵敏度的接收线圈。

公开(公告)号：US06366091B1

公开(公告)日：2002-04-02

申请号：US09424533

申请日：1999-11-24

申请人： Tetsuhiko Takahashi ,  Hiromichi Shimizu

发明人： Tetsuhiko Takahashi ,  Hiromichi Shimizu

IPC分类号： G01V300

CPC分类号： G01R33/56341

摘要： A plurality of signal acquisition steps 103 to 106 are executed continuously in succession to an inversion longitudinal magnetization generation step 101 for generating inversion magnetization by applying inversion RF pulses to an object. Similar process steps are iterated in another inversion longitudinal magnetization step in a slice non-selecting mode, and the difference is determined between image data acquired by the first signal acquisition steps 103 to 106 and image data acquired by the second signal acquisition steps 107 to 110 to acquire a perfusion image. In this instance, the mode of applying the gradient magnetic field is made different in each signal acquisition step, and images of a plurality of slices are acquired. The process steps described above are iterated while the correspondence relation between an inversion time TI and a selected slice is changed. An image having different inversion times can thus be acquired within a short time for a plurality of slices. Consequently, an image reflecting the time change of perfusion and having a high diagnostic value can be acquired over a broad range.

摘要翻译： 连续执行多个信号获取步骤103至106，以反转纵向磁化生成步骤101，通过向对象施加反向RF脉冲来产生反转磁化。 在切片非选择模式中的另一个反转纵向磁化步骤中迭代类似的处理步骤，并且在由第一信号获取步骤103至106获取的图像数据与由第二信号获取步骤107至110获取的图像数据之间确定差异 获取灌注图像。 在这种情况下，在每个信号获取步骤中使施加梯度磁场的模式不同，并且获取多个片的图像。 迭代上述处理步骤，同时改变反转时间TI和所选切片之间的对应关系。 因此，可以在多个切片的短时间内获取具有不同反转时间的图像。 因此，可以在宽范围内获取反映灌注时间变化并具有高诊断价值的图像。

公开(公告)号：US5755665A

公开(公告)日：1998-05-26

申请号：US610979

申请日：1996-03-01

申请人： Tetsuhiko Takahashi ,  Shigeru Watanabe ,  Kenji Takiguchi

发明人： Tetsuhiko Takahashi ,  Shigeru Watanabe ,  Kenji Takiguchi

IPC分类号： G01R33/46 ,  A61B5/055 ,  G01R33/48 ,  G01R33/54

CPC分类号： G01R33/4835

摘要： A nuclear magnetic resonance imaging apparatus and an imaging method. A slice gradient magnetic field and a first radio frequency (RF) pulse magnetic field or the first and second RF pulse magnetic fields are applied to an object so as to selectively excite nuclear spins of the object and to generate echo signals by the application of the magnetic fields. The echo signals are measured by applying to the object a read gradient magnetic field whose polarity inverses continuously at least a plurality of times. A plurality of first RF pulse magnetic fields are generated in one pulse sequence. These RF pulse magnetic fields excite the nuclear spins of a plurality of different slices, and a plurality of different slices are selected. Sets of a plurality of echo signals from different slices are defected whenever the read gradient magnetic field is applied.

摘要翻译： 核磁共振成像装置和成像方法。 切片梯度磁场和第一射频（RF）脉冲磁场或第一和第二RF脉冲磁场被施加到对象，以便选择性地激发对象的核自旋，并且通过应用 磁场。 回波信号通过向对象施加读极梯度磁场来测量，其极性连续反转至少多次。 在一个脉冲序列中产生多个第一RF脉冲磁场。 这些RF脉冲磁场激发多个不同切片的核自旋，并且选择多个不同的切片。 每当施加读取梯度磁场时，来自不同切片的多个回波信号的集合都是缺陷的。

公开(公告)号：US20140292334A1

公开(公告)日：2014-10-02

申请号：US14241515

申请日：2012-07-27

申请人： Yukio Kaneko ,  Yoshihisa Soutome ,  Yoshitaka Bito ,  Hiroyuki Takeuchi ,  Tetsuhiko Takahashi ,  Hideta Habara ,  Yosuke Otake

发明人： Yukio Kaneko ,  Yoshihisa Soutome ,  Yoshitaka Bito ,  Hiroyuki Takeuchi ,  Tetsuhiko Takahashi ,  Hideta Habara ,  Yosuke Otake

IPC分类号： G01R33/565

CPC分类号： G01R33/5659 ,  A61B5/055 ,  G01R33/246 ,  G01R33/4835 ,  G01R33/5612

摘要： With minimizing extension of imaging time, the B1 non-uniformity reducing effect of RF shimming is maximized for an imaging section of an arbitrary axis direction and an arbitrary position. B1 distributions are measured for only several sections of one predetermined direction, and a radio frequency magnetic field condition that maximizes the B1 non-uniformity reducing effect for an imaging section of an arbitrary direction and an arbitrary position is calculated from the B1 distribution data. For example, after B1 distributions of only several sections of the AX direction are measured, the optimal radio frequency magnetic field condition for an imaging section of an arbitrary position for the AX direction is obtained by interpolation with optimal radio frequency magnetic field conditions calculated from B1 distributions of two sections near the imaging section, and the optimal radio frequency magnetic field condition for an imaging section of an arbitrary position for the SAG or COR direction is obtained by using only B1 values of a crossing region with the imaging section extracted from the B1 distributions.

摘要翻译： 随着成像时间的延长最小化，对于任意轴方向和任意位置的成像部分，RF匀场的B1均匀性减小效果最大化。 B1分布仅测量一个预定方向的几个部分，并且从B1分布数据计算使任意方向和任意位置的成像部分的B1不均匀性减小效果最大化的射频磁场条件。 例如，在AX方向的仅仅几个部分的B1分布被测量之后，通过利用从B1计算出的最佳射频磁场条件进行插值来获得用于AX方向的任意位置的成像部分的最佳射频磁场条件 通过仅使用从B1提取的成像部分的交叉区域的B1值获得用于SAG或COR方向的任意位置的成像部分的最佳射频磁场条件， 分布。

公开(公告)号：US20120299594A1

公开(公告)日：2012-11-29

申请号：US13577885

申请日：2011-01-21

申请人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

发明人： Hideta Habara ,  Yoshitaka Bito ,  Hisaaki Ochi ,  Yoshihisa Soutome ,  Masayoshi Dohata ,  Tetsuhiko Takahashi ,  Hiroyuki Takeuchi

IPC分类号： G01R33/28

CPC分类号： G01R33/34046

摘要： There is provided a technique for securing a comfortable examination space in a tunnel type MRI apparatus without increasing the manufacturing cost of the MRI apparatus and sacrificing performance thereof. In an RF coil provided with a hollow-shaped outer conductive element and a strip-shaped conductive element disposed along the outer conductive element in the axial direction, meander lines constituting the strip-shaped conductive element are disposed at uneven distances from the outer conductive element to secure an internal space. In order to obtain uniform sensitivity at the center of the RF coil, the strip-shaped conductive element is constituted with N of connected meander lines, and length of the strip-shaped conductive element is adjusted so that, in the strip-shaped conductive element resonating at resonance frequency of the antenna, nodes are formed in a number of (M+1)×N−1, wherein M is 0 or a natural number of 1 or larger.

摘要翻译： 提供了一种用于在隧道式MRI装置中确保舒适检查空间而不增加MRI装置的制造成本并牺牲其性能的技术。 在具有中空状的外部导电元件的RF线圈和沿着外部导电元件沿轴向设置的条状导电元件，构成条形导电元件的曲折线设置在与外部导电元件不均匀的距离处 以确保内部空间。 为了在RF线圈的中心获得均匀的灵敏度，带状导电元件由N个连接的曲折线构成，并且条形导电元件的长度被调节，使得在带状导电元件 在天线的谐振频率下共振，以（M + 1）×N-1的数量形成节点，其中M为0或自然数为1或更大。