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：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：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：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：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：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：US5195524A

公开(公告)日：1993-03-23

申请号：US647563

申请日：1991-01-29

申请人： Kenji Takiguchi ,  Etsuji Yamamoto ,  Hideki Kohno

发明人： Kenji Takiguchi ,  Etsuji Yamamoto ,  Hideki Kohno

IPC分类号： G01P13/00 ,  A61B5/026 ,  A61B5/055 ,  G01R33/44 ,  G01R33/48 ,  G01R33/563

CPC分类号： A61B5/0263 ,  G01R33/56308 ,  G01R33/5635 ,  G01R33/56366

摘要： An MRI flow imaging method and apparatus wherein a width of a relevant region in a direction is set, in which fluid in a subject body flows, and a first 90.degree. radio frequency pulse is applied thereto to excite selectively a relevant region; a gradient magnetic field is applied thereto in a direction, in which it is desired to project the fluid, after an application of a first 90.degree. radio frequency pulse so that a magnetization signal in a projection direction is zero, a second radio frequency pulse is applied to a relevant region to excite the relevant region selectively, after new fluid has poured in the relevant region, an echo signal is measured by applying an encoding gradient magnetic field and a reading out gradient magnetic field in a form of a flow sensitive pulse capable of detecting an echo signal from the fluid, and an echo signal is processed to obtain a two-dimensional image of the fluid.

摘要翻译： 一种MRI流程成像方法和装置，其中设定了被检体内的流体流过的朝向方向的相关区域的宽度，并且向其施加第一90°射频脉冲以选择性地激发相关区域; 在施加第一90°射频脉冲之后，在期望投射流体的方向上施加梯度磁场，使得投影方向上的磁化信号为零，第二射频脉冲为 应用于相关区域以选择性地激发相关区域，在新流体流入相关区域之后，通过施加编码梯度磁场和读出梯度磁场来测量回波信号，其形式为流敏脉冲能力 检测来自流体的回波信号，并且处理回波信号以获得流体的二维图像。

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：US5928146A

公开(公告)日：1999-07-27

申请号：US815069

申请日：1997-03-11

申请人： Hiroyuki Itagaki ,  Kenichi Okajima ,  Tetsuhiko Takahashi ,  Kenji Takiguchi

发明人： Hiroyuki Itagaki ,  Kenichi Okajima ,  Tetsuhiko Takahashi ,  Kenji Takiguchi

IPC分类号： G01R33/561 ,  A61B5/055

CPC分类号： G01R33/56554

摘要： An inspection apparatus using nuclear magnetic resonance having arithmetic and control means for controlling a pulse sequence for detecting a nuclear magnetic resonance signal from a target to be inspected and calculating the detected signal. The arithmetic and control means controls an echo planar pulse sequence for acquiring a plurality of images of a predetermined same region of the target to be inspected; and arranges echo signal data obtained by measuring the inspection target by the echo planar pulse sequence and forms an EPI data set; designates a plurality of data points in k-space as observed points; designates a predetermined EPI data set to reference data for body motion for correcting influence by the body motion of the inspection target and calculates a reference phase as a phase of the body motion reference data at the observed points; calculates the phase of the EPI data set at the observed points; calculates a body motion correcting value expressing the influence by the body motion of the inspection target by using the phase difference between the phase of the EPI data set and the reference phase; and executes a process for eliminating the influence by the body motion of the inspection target by removing the phase difference of the EPI data set of the target to be inspected by using the body motion correction values.

摘要翻译： 一种使用核磁共振的检查装置，具有算术和控制装置，用于控制用于检测来自待检查目标的核磁共振信号的脉冲序列，并计算检测信号。 算术和控制装置控制回波平面脉冲序列，用于获取待检查目标的预定相同区域的多个图像; 并且通过回波平面脉冲序列排列通过测量检查对象获得的回波信号数据，并形成EPI数据组; 指定k空间中的多个数据点作为观察点; 将预定的EPI数据集指定为身体运动的参考数据，以校正由检查对象的身体运动产生的影响，并计算参考相位作为观察点处的身体运动参考数据的相位; 计算观测点处EPI数据集的相位; 通过使用EPI数据集的相位与参考相位之间的相位差来计算表示由检查对象的身体运动产生的影响的身体运动校正值; 并且通过使用身体运动校正值来去除被检查对象的EPI数据集的相位差来消除检查对象的身体运动的影响的处理。

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。