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：US5572124A

公开(公告)日：1996-11-05

申请号：US361664

申请日：1994-12-22

申请人： Yoshitaka Bito ,  Satoshi Hirata ,  Takayuki Nabeshima ,  Etsuji Yamamoto

发明人： Yoshitaka Bito ,  Satoshi Hirata ,  Takayuki Nabeshima ,  Etsuji Yamamoto

IPC分类号： A61B5/055 ,  G01R33/48 ,  G01R33/54 ,  G01R33/563 ,  G01R33/00 ,  G01V3/00

CPC分类号： G01R33/4828 ,  G01R33/56341

摘要： In an inspection method which generates a static magnetic field, a gradient magnetic field and a radio frequency magnetic field, detects nuclear magnetic resonance signals from an inspection object, computes and processes the nuclear magnetic resonance signals so detected and outputs the result of computation processing, a gradient magnetic field for generating signal attenuation by diffusion and an oscillating gradient magnetic field for generating chemical shift information and spatial information of the materials contained in the inspection object are applied, separation and acquisition of spatial information of each material contained in the inspection object are simultaneously conducted, and a measurement time is shortened.

摘要翻译： 在产生静磁场，梯度磁场和射频磁场的检查方法中，检测来自检查对象的核磁共振信号，对所检测的核磁共振信号进行计算处理，并输出计算处理结果， 应用用于通过扩散产生信号衰减的梯度磁场和用于产生检测对象中包含的材料的化学位移信息和空间信息的振荡梯度磁场，检测对象中包含的每种材料的空间信息的分离和获取是 同时进行，缩短测定时间。

公开(公告)号：US5502384A

公开(公告)日：1996-03-26

申请号：US243907

申请日：1994-05-17

申请人： Chitose Nakaya ,  Yoshitaka Bito ,  Etsuji Yamamoto ,  Hiroshi Nishimura ,  Hiroyuki Takeuchi ,  Shigeru Watanabe ,  Akihiro Miyajima ,  Hitoshi Arai

发明人： Chitose Nakaya ,  Yoshitaka Bito ,  Etsuji Yamamoto ,  Hiroshi Nishimura ,  Hiroyuki Takeuchi ,  Shigeru Watanabe ,  Akihiro Miyajima ,  Hitoshi Arai

IPC分类号： A61B5/055 ,  G01R33/28 ,  G01R33/561 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/565 ,  G01R33/561

摘要： In an image reconstruction method in a nuclear magnetic resonance imaging apparatus, the method comprises first and second steps to get detected data S.sub.I for at least about half of region inclusive of an origin and data S.sub.IV in a region symmetric with respect to a line passing through an origin on one of axes from the detected region in the acquired data space and parallel to the other axis, respectively, third and fourth steps to perform inverse Fourier transform on the data S.sub.I and S.sub.IV, respectively, a fifth step to get a complex conjugate value of the result obtained from Step 3, a sixth step to get a complex conjugate value of the result obtained from Step 4, a seventh step to calculate a phase map from the results obtained from the second, third, fourth, fifth and sixth steps, an eighth step to multiply the result obtained from step 6 by the phase map obtained from step 7 and to obtain a phase corrected data, and a ninth step to sum the result obtained from the third step and the result obtained from the eighth step. The method can thus obtain the whole reconstructed image.

摘要翻译： 在核磁共振成像装置中的图像重建方法中，该方法包括第一和第二步骤，用于在相对于通过的线对称的区域中获得包含原点和数据SIV的区域的至少约一半的检测数据SI 在获取的数据空间中的检测区域中的一个轴上的原点，并且平行于另一个轴的原点;第三和第四步骤，分别对数据SI和SIV执行逆傅里叶变换，第五步骤以获得复共轭 从步骤3获得的结果的值，第六步骤，获得从步骤4获得的结果的复共轭值，第七步骤，从根据从第二，第三，第四，第五和第六步骤获得的结果计算相位图 第八步，将从步骤6获得的结果乘以从步骤7获得的相位图，并获得相位校正数据;第九步骤，将从第三步骤获得的结果与res 从第八步获得。 因此，该方法可以获得整个重建图像。

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：US4458172A

公开(公告)日：1984-07-03

申请号：US406015

申请日：1982-08-06

申请人： Hiroshi Takeuchi ,  Yukio Ito ,  Etsuji Yamamoto ,  Shigeru Jyomura ,  Sakichi Ashida

发明人： Hiroshi Takeuchi ,  Yukio Ito ,  Etsuji Yamamoto ,  Shigeru Jyomura ,  Sakichi Ashida

IPC分类号： B06B1/06 ,  H01L41/187 ,  G10K11/36 ,  H01L41/18

CPC分类号： B06B1/0622 ,  H01L41/187

摘要： An ultrasonic probe includes a resonator made of a piezoelectric ceramic material which is obtained by subjecting a ceramic composition containing 44.7 to 46.3 mol % of PbO, 50.9 to 51.7 mol % of TiO.sub.2, 1.8 to 2.7 mol % of Sm.sub.2 O.sub.3 and 0.5 to 1.0 mol % of MnO.sub.2 to poling treatment in such a manner that the ceramic composition is applied with an electric field of 60 to 80 kV/cm at a temperature of 130.degree. to 160.degree. C.

摘要翻译： 超声波探头包括由压电陶瓷材料制成的谐振器，该共振器通过使含有44.7〜46.3摩尔％的PbO，50.9〜51.7摩尔％的TiO 2，1.8〜2.7摩尔％的Sm 2 O 3和0.5〜1.0摩尔％的陶瓷组合物， 的MnO 2以使陶瓷组合物在130〜160℃的温度下施加60〜80kV / cm的电场的方式进行极化处理。

公开(公告)号：US06344784B1

公开(公告)日：2002-02-05

申请号：US09642306

申请日：2000-08-21

申请人： Satoshi Murata ,  Hideyuki Mihara ,  Etsuji Yamamoto ,  Minoru Tamada

发明人： Satoshi Murata ,  Hideyuki Mihara ,  Etsuji Yamamoto ,  Minoru Tamada

IPC分类号： H01F2702

CPC分类号： H01F17/0033 ,  H01F27/292

摘要： A coil component includes a conductor film provided on the surface of a core having flanges. On one flange, first and second dividing grooves and a connecting groove are provided, whereby first and second terminals are defined. On the other flange, third and fifth dividing grooves and a connecting groove are provided, whereby third and fourth terminals are defined. First and second winding-around grooves are connected to the respective dividing grooves and arranged substantially parallel to each other. A coil connected to the first and third terminals and a coil connected to the second and fourth terminals are also provided.

摘要翻译： 线圈部件包括设置在具有凸缘的芯的表面上的导体膜。 在一个凸缘上，设置有第一和第二分隔槽和连接槽，由此限定第一和第二端子。 在另一个法兰上，设置有第三和第五分隔槽和连接槽，由此限定第三和第四端子。 第一和第二缠绕槽连接到相应的分隔槽并且基本上彼此平行地布置。 还提供了连接到第一和第三端子的线圈以及连接到第二和第四端子的线圈。

公开(公告)号：US5789922A

公开(公告)日：1998-08-04

申请号：US645478

申请日：1996-05-13

申请人： Hisaaki Ochi ,  Etsuji Yamamoto ,  Yo Taniguchi

发明人： Hisaaki Ochi ,  Etsuji Yamamoto ,  Yo Taniguchi

IPC分类号： G01R33/46 ,  A61B5/055 ,  G01R33/48 ,  G01R33/561

CPC分类号： G01R33/446 ,  G01R33/5615

摘要： In an inspecting method based on nuclear magnetic resonance, a burst wave having a plurality of sub-pulses frequency-modulated with a high frequency is generated, the burst wave is amplitude-modulated with at least a function which repeats polarity inversion, the amplitude-modulated burst wave is irradiated, as an exciting high frequency pulse, to an object to be inspected, and gradient magnetic fields are generated in predetermined pulse sequence to measure a nuclear magnetic resonance signal.

摘要翻译： 在基于核磁共振的检查方法中，产生具有高频率频率调制的多个子脉冲的脉冲波，突发波被至少以重复极性反转的功能进行幅度调制， 作为激励高频脉冲将调制脉冲波照射到要检查的物体，并且以预定脉冲序列产生梯度磁场以测量核磁共振信号。

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：US5592088A

公开(公告)日：1997-01-07

申请号：US427868

申请日：1995-04-26

申请人： Yoshikuni Matsunaga ,  Tetsuhiko Takahashi ,  Etsuji Yamamoto

发明人： Yoshikuni Matsunaga ,  Tetsuhiko Takahashi ,  Etsuji Yamamoto

IPC分类号： G01R33/34 ,  G01R33/341 ,  G01R33/3415 ,  G01R33/36 ,  G01R33/48

CPC分类号： G01R33/34053 ,  G01R33/34061 ,  G01R33/3415 ,  G01R33/3621 ,  G01R33/3678

摘要： A probe for an MRI apparatus in a vertical magnetic field system including: an array coil which is formed by arranging a plurality of unit coils, which can be driven independently of one another, in a direction perpendicularly intersecting a direction of a static magnetic field; and a compensating coil which forms a magnetic field in a direction perpendicularly intersecting both a direction of a magnetic field formed by the array coil and the direction of the magnetic field, a signal detected by the array coil and a signal detected by the compensating coil being composed so as to be in phase with each other, thereby to be outputted.

摘要翻译： 一种用于垂直磁场系统中的MRI装置的探针，包括：阵列线圈，其通过在与静磁场方向垂直相交的方向上排列可彼此独立地驱动的多个单位线圈形成; 以及补偿线圈，其在与由阵列线圈形成的磁场的方向和磁场方向垂直相交的方向上形成磁场，由阵列线圈检测的信号和由补偿线圈检测的信号是 被构成为彼此同相，从而被输出。

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。