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

公开(公告)号：US07358726B2

公开(公告)日：2008-04-15

申请号：US10242442

申请日：2002-09-13

申请人： Hisaaki Ochi ,  Yo Taniguchi ,  Hiroyuki Itagaki ,  Shinichiro Umemura

发明人： Hisaaki Ochi ,  Yo Taniguchi ,  Hiroyuki Itagaki ,  Shinichiro Umemura

IPC分类号： G01V3/00

CPC分类号： G01R33/3806 ,  A61B5/055

摘要： An MRI system using an open type magnet, wherein two coils different in radius for generating gradient magnetic fields in a vertical direction are arranged in the open type magnet for generating a static magnetic field in the vertical direction. Currents are caused to flow through the two coils in directions opposite to each other to improve the degree of uniformity of the magnetic field in the vertical direction, thereby reducing the degradation thereof by equal to or smaller than 2 figures compared with the degree of uniformity of the static magnetic field generated by the existing MRI system. The positional information about a read-out direction is given through the dynamic control for the RF magnetic field to give the positional information about other two axes directions based on the gradient magnetic field having strength much larger than that of nonuniformity of the magnetic field.

摘要翻译： 使用开放型磁体的MRI系统，其中在垂直方向上产生梯度磁场的半径不同的两个线圈被布置在用于在垂直方向上产生静态磁场的开放型磁体中。 引起电流流过彼此相反方向的两个线圈，以提高垂直方向上磁场的均匀度，从而与其均匀度相比降低等于或小于2个数字 由现有MRI系统产生的静磁场。 通过对RF磁场的动态控制，给出关于读出方向的位置信息，基于具有比磁场不均匀性强的强度的梯度磁场给出关于其他两个轴方向的位置信息。

公开(公告)号：US06744251B2

公开(公告)日：2004-06-01

申请号：US10309150

申请日：2002-12-04

申请人： Yo Taniguchi ,  Yukari Yamamoto ,  Hisaaki Ochi ,  Shinichiro Umemura

发明人： Yo Taniguchi ,  Yukari Yamamoto ,  Hisaaki Ochi ,  Shinichiro Umemura

IPC分类号： G01V300

CPC分类号： G01R33/4833

摘要： A nuclear-magnetic-resonance inspection apparatus that enables an examiner to designate directly a section of a subject to be imaged. The NMR inspection apparatus has a section-designating unit containing reference objects A, B, and C that can be set at three reference points, and can be held in the hand of an examiner to be moved and operated in close proximity to the subject, wherein a prescribed part of a plane including the reference objects set at up to three reference points is the section of the subject to be imaged. While watching the subject, the examiner can directly designate a section to be imaged. Thus, diagnoses can be made easily and quickly.

摘要翻译： 核磁共振检查装置，使得检查者能够直接指定待成像对象的一部分。 NMR检查装置具有包含可设置在三个参考点上的参考对象A，B和C的区段指定单元，并且可以保持在检查者的手中，以便靠近对象移动和操作， 其中包括设置在多达三个参考点处的参考对象的平面的规定部分是待成像对象的部分。 在观看主题的同时，审查员可以直接指定要成像的部分。 因此，可以容易且快速地进行诊断。

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：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：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。