公开(公告)号：US5465719A

公开(公告)日：1995-11-14

申请号：US98775

申请日：1993-07-29

申请人： Hiroyuki Itagaki ,  Yo Taniguchi ,  Hidemi Shiono ,  Kenji Takiguchi ,  Etsuji Yamamoto

发明人： Hiroyuki Itagaki ,  Yo Taniguchi ,  Hidemi Shiono ,  Kenji Takiguchi ,  Etsuji Yamamoto

IPC分类号： A61B5/055 ,  G01R33/20 ,  G01R33/28 ,  G01R33/38 ,  G01R33/385 ,  H01F7/20

CPC分类号： G01R33/385 ,  G01R33/3802 ,  G01R33/3854

摘要： A bobbin for holding a gradient magnetic field coil, having a changeable size and sectional shape (a separable bobbin) is constituted by assembling coil supporters (a bobbin divided into a plurality of segments). The separable bobbin has coil supporters of an upper part a bottom part and a set of side surface parts and at least two supporting rods made of a nonmagnetic substance are fitted to the side surface parts of the coil supporters. Holes permitting the insertion of the supporting rods are bored in the upper and bottom parts of the coil supporters. The length d1 between both side surface parts can be made variable by adjusting the insertion length of the supporting rod into the upper and bottom parts. Accordingly, the distance between a patient and a gradient magnetic field can be reduced, and an intended gradient magnetic field intensity can be generated by a smaller current producing the gradient magnetic field than in the prior art. Setting of the patient to an MRI imaging apparatus becomes also easier, and there can be obtained a gradient magnetic field coil capable of being easily fitted and removed to and from the MRI imaging apparatus.

摘要翻译： 用于保持具有可变尺寸和截面形状（分离线圈架）的梯度磁场线圈的线轴由线圈支架（分为多个段的线轴）组装而成。 可分离筒管具有上部的线圈支撑件，底部部分和一组侧面部分，并且至少两个由非磁性物质制成的支撑杆装配到线圈支撑件的侧表面部分。 允许插入支撑杆的孔在线圈支撑件的上部和底部中钻孔。 通过将支撑杆的插入长度调节到上部和底部，两个侧面部分之间的长度d1可以变化。 因此，可以减少患者与梯度磁场之间的距离，并且通过产生梯度磁场的较小电流可以产生预期的梯度磁场强度，而不是现有技术。 将患者设置到MRI成像设备变得更容易，并且可以获得能够容易地装配和去除MRI成像设备的梯度磁场线圈。

公开(公告)号：US5394872A

公开(公告)日：1995-03-07

申请号：US44778

申请日：1993-04-12

申请人： Kenji Takiguchi ,  Hidemi Shiono ,  Hiroyuki Itagaki ,  Etsuji Yamamoto

发明人： Kenji Takiguchi ,  Hidemi Shiono ,  Hiroyuki Itagaki ,  Etsuji Yamamoto

IPC分类号： A61B5/055 ,  G01R33/48 ,  G01R33/561 ,  G01R33/563 ,  G01R33/20

CPC分类号： G01R33/563 ,  G01R33/5618 ,  G01R33/56333

摘要： In a magnetic resonance imagining method, using an effect that a fluid flows out of a plane where it is selectively excited between the time of applying a 90.degree. radio frequency pulse and the time of applying of a 180.degree. radio frequency pulse, two, images are separately constructed from multiple echo signals which are sampled before applying the 180.degree. radio frequency pulse and multiple echo signals which are sampled after applying the 180.degree. radio frequency pulse. An image of the fluid flow and an image of a static part are separated from each other based on a difference between the two constructed images.

摘要翻译： 在磁共振想象方法中，使用流体从施加90°射频脉冲的时间和施加180°射频脉冲的时间之间选择性激发的平面流出的效果，两个图像 分别由在应用180°射频脉冲之前被采样的多个回波信号和在施加180°射频脉冲之后被采样的多个回波信号构成。 基于两个构造的图像之间的差异，流体流动的图像和静态部分的图像彼此分离。

公开(公告)号：US5539311A

公开(公告)日：1996-07-23

申请号：US160807

申请日：1993-12-03

申请人： Kenji Takiguchi ,  Hiroyuki Itagaki ,  Hidemi Shiono ,  Etsuji Yamamoto

发明人： Kenji Takiguchi ,  Hiroyuki Itagaki ,  Hidemi Shiono ,  Etsuji Yamamoto

IPC分类号： G01R33/561 ,  G01V3/00

CPC分类号： G01R33/56554

摘要： In magnetic resonance imaging, a first echo train is obtained by applying a readout gradient magnetic field to a region of interest to be imaged and periodically inverting the polarity of the readout gradient magnetic field, without applying an encoding gradient magnetic field to the region of interest. A periodic change of phase shift of the first echo train is detected from the first echo train. Information indicating phase shifts of all of the echoes in the first echo train is obtained using the periodic change of phase shift. A second echo train is obtained by applying a readout gradient magnetic field and an encoding magnetic field to the region of interest and periodically inverting the polarity of the readout gradient magnetic field. Phases of echoes in the second echo train are corrected using the information indicating phase shifts of all of the echoes in the first echo train.

摘要翻译： 在磁共振成像中，通过将读出梯度磁场施加到要成像的感兴趣区域并周期性地反转读出梯度磁场的极性，而不对感兴趣的区域施加编码梯度磁场，获得第一回波串 。 从第一回波列检测第一回波串的相移的周期性变化。 使用相移的周期性变化来获得指示第一回波列中的所有回波的相移的信息。 通过将读出梯度磁场和编码磁场施加到感兴趣的区域并周期性地反转读出梯度磁场的极性来获得第二回波串。 使用指示第一回波列中的所有回波的相移的信息来校正第二回波列中的回波相位。

公开(公告)号：US5493224A

公开(公告)日：1996-02-20

申请号：US25785

申请日：1993-03-03

申请人： Hidemi Shiono ,  Kenji Takiguchi ,  Etsuji Yamamoto

发明人： Hidemi Shiono ,  Kenji Takiguchi ,  Etsuji Yamamoto

IPC分类号： G01R33/561 ,  G01V3/00

CPC分类号： G01R33/56554 ,  G01R33/5616

摘要： A magnetic resonance imaging method and apparatus employing a pulse sequence including a periodically switched readout gradient and a phase encoding gradient to derive a series of echo signals. Prior to execution of the pulse sequence for acquiring data for imaging, a pulse sequence in which the phase encoding gradient is cancelled is executed to obtain information of deviation in position of echo peaks. Thereafter, a pulse sequence including the phase encoding gradient is executed and at this time, sampling start timings for echo data sampling in respective phase periods of the readout gradient are controlled according to the information of the echo peak deviation. Further, a phase difference between data of odd number echo signals and data of even number echo signals is compensated by rotating either of the data of the odd number echo signals or the even number echo signals by a suitable rotating angle to minimize artifacts.

摘要翻译： 一种磁共振成像方法和装置，其采用包括周期性切换读出梯度和相位编码梯度的脉冲序列以导出一系列回波信号。 在执行用于获取用于成像的数据的脉冲序列之前，执行消除相位编码梯度的脉冲序列以获得回波峰位置偏差的信息。 此后，执行包括相位编码梯度的脉冲序列，此时，根据回波峰值偏差的信息来控制读出梯度的各个相位周期中的回波数据采样的采样开始定时。 此外，奇数回波信号的数据和偶数回波信号的数据之间的相位差通过旋转奇数回波信号的数据或偶数回波信号中的适当旋转角来补偿，以最小化伪像。

公开(公告)号：US5427102A

公开(公告)日：1995-06-27

申请号：US331156

申请日：1994-10-28

申请人： Shin'ichi Shimode ,  Hiroshi Inouye ,  Norihide Saho ,  Shinya Okabe ,  Masayuki Otsuka ,  Yukiji Iwase ,  Etsuji Yamamoto ,  Hidemi Shiono ,  Kenji Takiguchi

发明人： Shin'ichi Shimode ,  Hiroshi Inouye ,  Norihide Saho ,  Shinya Okabe ,  Masayuki Otsuka ,  Yukiji Iwase ,  Etsuji Yamamoto ,  Hidemi Shiono ,  Kenji Takiguchi

IPC分类号： A61B5/055 ,  G01N33/38 ,  G01R33/28 ,  G01R33/385 ,  G01R33/54 ,  G10K11/178 ,  H04R1/40 ,  H04R3/00 ,  H04B15/00

CPC分类号： G01R33/3854 ,  G10K11/1786 ,  H04R1/40 ,  H04R3/00 ,  G01R33/283 ,  G01R33/385 ,  G01R33/543 ,  G10K2210/1161 ,  G10K2210/3026 ,  G10K2210/3027 ,  Y10S128/925

摘要： An active noise cancellation apparatus of an MRI apparatus, including a detector for detecting vibration of a bobbin or a driving signal of a magnetism generator as a noise source signal, error signal detectors for detecting actual noise near the ears of a patient, a circuit for generating a noise cancellation signal having an opposite phase to a phase of a noise signal generated by an MRI apparatus and having an amplitude proportional to the output of the error signal detectors, from the detected noise source signal and the output of the error signal detectors, and a sound generator for generating a sound wave by the noise cancellation signal.

摘要翻译： 一种MRI装置的主动噪声消除装置，包括用于检测线轴的振动的检测器或作为噪声源信号的磁性发生器的驱动信号，用于检测患者耳部附近的实际噪声的误差信号检测器， 产生噪声消除信号，所述噪声消除信号具有与由MRI装置产生的噪声信号的相位相反的相位，并且具有与所述误差信号检测器的输出成比例的振幅，所述噪声消除信号与所述检测到的噪声源信号和所述误差信号检测器的输出相对应， 以及用于通过噪声消除信号产生声波的声音发生器。

公开(公告)号：US5221898A

公开(公告)日：1993-06-22

申请号：US798907

申请日：1991-11-27

申请人： Kenji Takiguchi ,  Hidemi Shiono ,  Etsuji Yamamoto ,  Ryuichi Suzuki

发明人： Kenji Takiguchi ,  Hidemi Shiono ,  Etsuji Yamamoto ,  Ryuichi Suzuki

IPC分类号： G01R33/561 ,  G01R33/563

CPC分类号： G01R33/56308 ,  G01R33/5616 ,  G01R33/56316

摘要： This invention relates to a ultra-high speed nuclear magnetic resonance fluid imaging method for selectively reconstructing projected images of a fluid from an echo train generated by the use of a readout gradient magnetic field which inverses periodically. A pulse-like encoding gradient magnetic field is used in combination with a readout gradient magnetic field which inverses periodically, so as to generate an echo train containing alternately echoes whose phase change of magnetization due to a flow is emphasized and echoes whose phase change of magnetization due to the flow is corrected, and subjected sequentially to phase encoding. A data train containing only the echoes whose phase change of magnetization due to the flow is emphasized and a data train containing only the echoes whose phase change of magnetization due to the flow is corrected are formed from sampling data of these echoes, respectively, and two images are then obtained by subjecting them individually to two-dimensional Fourier transform. Both of these images are then subtracted.

摘要翻译： 本发明涉及一种超高速核磁共振流体成像方法，用于从通过使用周期性反转的读出梯度磁场产生的回波序列中选择性地重构流体的投影图像。 脉冲式编码梯度磁场与周期性反转的读出梯度磁场结合使用，以便生成包含交替回波的回波串，该回波串被强调由于流动引起的磁化相位变化，并且回波其磁化相位变化 由于流程被校正，并且顺序地进行相位编码。 仅包含其中由于流动引起的磁化相位变化的回波的数据列被分别由这些回波的采样数据分别形成，并且仅包含校正由流动引起的磁化相位变化的回波的数据列分别形成 然后通过对它们进行二维傅立叶变换而获得图像。 然后将这两个图像相减。

公开(公告)号：US5754047A

公开(公告)日：1998-05-19

申请号：US778251

申请日：1997-01-08

申请人： Yukari Onodera ,  Etsuji Yamamoto ,  Hiroyuki Itagaki ,  Yo Taniguchi

发明人： Yukari Onodera ,  Etsuji Yamamoto ,  Hiroyuki Itagaki ,  Yo Taniguchi

IPC分类号： G01R33/3875 ,  G01R33/54 ,  G01V3/00

CPC分类号： G01R33/3875 ,  G01R33/4835

摘要： An inspection method by means of an inspection apparatus using nuclear magnetic resonance and having magnetic field generating apparatus for generating a static magnetic field, gradient magnetic fields and an RF magnetic field; magnetic field generating apparatus by means of additional shim coils, which vary homogeneity of the static magnetic field by varying current flowing therethrough; signal detecting apparatus for detecting nuclear magnetic resonance signals from an object to be inspected; an apparatus for processing signals detected by the signal detecting apparatus; and control apparatus for controlling currents flowing through the shim coils, which method using nuclear magnetic resonance comprises a step of storing shim currents corresponding to each of a plurality of slices, capable of improving homogeneity of the static magnetic field for each of the plurality of slices, and a step of switching over the shim currents to those corresponding to a relevant slice to be measured prior to measurements of nuclear magnetic resonance signals from the slice. This inspection method can be applied also to a case where measurements of other slices are effected in intervals of measurements of the relevant slice.

摘要翻译： 使用核磁共振的检查装置的检查方法，具有用于产生静磁场的磁场产生装置，梯度磁场和RF磁场; 通过附加的垫片线圈产生磁场产生装置，其通过改变流过其中的电流来改变静态磁场的均匀性; 信号检测装置，用于检测来自被检体的核磁共振信号; 用于处理由信号检测装置检测的信号的装置; 以及用于控制流过所述垫片线圈的电流的控制装置，所述使用核磁共振的方法包括存储对应于多个片中的每一个的片状电流的步骤，能够提高所述多个片中的每一个的静态磁场的均匀性 以及在来自切片的核磁共振信号的测量之前，将垫片电流切换到与要测量的相关切片相对应的片电流的步骤。 这种检查方法也可以应用于其他切片的测量在相关切片的测量间隔中实现的情况。

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：US5602480A

公开(公告)日：1997-02-11

申请号：US422234

申请日：1995-04-14

申请人： Yukari Onodera ,  Etsuji Yamamoto ,  Hiroyuki Itagaki ,  Yo Taniguchi

发明人： Yukari Onodera ,  Etsuji Yamamoto ,  Hiroyuki Itagaki ,  Yo Taniguchi

IPC分类号： G01R33/3875 ,  G01R33/54 ,  G01R33/20

CPC分类号： G01R33/3875 ,  G01R33/4835

摘要： An inspection method by means of an inspection apparatus using nuclear magnetic resonance and having magnetic field generating apparatus for generating a static magnetic field, gradient magnetic fields and an RF magnetic field; magnetic field generating apparatus by means of additional shim coils, which vary homogeneity of the static magnetic field by varying current flowing therethrough; signal detecting apparatus for detecting nuclear magnetic resonance signals from an object to be inspected; an apparatus for processing signals detected by the signal detecting apparatus; and control apparatus for controlling currents flowing through the shim coils, which method using nuclear magnetic resonance comprises a step of storing shim currents corresponding to each of a plurality of slices, capable of improving homogeneity of the static magnetic field for each of the plurality of slices, and a step of switching over the shim currents to those corresponding to a relevant slice to be measured prior to measurements of nuclear magnetic resonance signals from the slice. This inspection method can be applied also to a case where measurements of other slices are effected in intervals of measurements of the relevant slice.

摘要翻译： 使用核磁共振的检查装置的检查方法，具有用于产生静磁场的磁场产生装置，梯度磁场和RF磁场; 通过附加的垫片线圈产生磁场产生装置，其通过改变流过其中的电流来改变静态磁场的均匀性; 信号检测装置，用于检测来自被检体的核磁共振信号; 用于处理由信号检测装置检测的信号的装置; 以及用于控制流过所述垫片线圈的电流的控制装置，所述使用核磁共振的方法包括存储对应于多个片中的每一个的片状电流的步骤，能够提高所述多个片中的每一个的静态磁场的均匀性 以及在来自切片的核磁共振信号的测量之前，将垫片电流切换到与要测量的相关切片相对应的片电流的步骤。 该检查方法也可以应用于在相关切片的测量的间隔中实现其他切片的测量的情况。

公开(公告)号：US4683433A

公开(公告)日：1987-07-28

申请号：US636995

申请日：1984-08-02

申请人： Etsuji Yamamoto ,  Hideki Kohno ,  Masao Kuroda ,  Shigeru Matsui ,  Hidemi Shiono

发明人： Etsuji Yamamoto ,  Hideki Kohno ,  Masao Kuroda ,  Shigeru Matsui ,  Hidemi Shiono

IPC分类号： G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/48 ,  G01R33/54 ,  G01R33/56

CPC分类号： G01R33/482 ,  G01R33/56

摘要： An NMR imaging apparatus and method for detecting a nuclear spin resonance signal from an object, which is placed in a magnetic field, to produce images of the object. At an instant when the spins come into phase after the signal detection by a first spin excitation, RF magnetic field pulses are applied for rotating the direction of the spin to that opposite to the initial state. After that, the spin excitation and the signal direction of second time are conducted to measure the data which are different in the effect of the relaxation time from the first measurements. By repeating these sequences, it is possible to produce a plurality of images such as an intensity image or a relaxation time enhanced image.

摘要翻译： 一种用于检测放置在磁场中的物体的核自旋共振信号的NMR成像设备和方法，以产生物体的图像。 在通过第一自旋激发在信号检测之后自旋进入相位的瞬间，施加RF磁场脉冲以将旋转方向旋转到与初始状态相反的方向。 之后，进行自旋激励和第二次的信号方向，以测量与第一次测量相比，松弛时间的影响不同的数据。 通过重复这些序列，可以产生多个图像，例如强度图像或弛豫时间增强图像。