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：US4791369A

公开(公告)日：1988-12-13

申请号：US72035

申请日：1987-07-10

申请人： Etsuji Yamamoto ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Hideki Kohno

IPC分类号： A61B5/055 ,  A61B10/00 ,  G01R33/24 ,  G01R33/48 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/24 ,  G01R33/56563 ,  G01R33/56518

摘要： A method of finding error distribution in the static magnetic field and distribution of deviations from straight lines in the gradient magnetic fields of an NMR imaging apparatus which employs the applied spin-warp method. A phantom whose shape has been known is measured in the read-out gradient magnetic fields having different polarities to obtain two spin density distribution images. The two images are then compared with the shape of said phantom to measure the distortion distributions of the images. Error in the static magnetic field and deviations of the gradient magnetic fields from the straight lines are analyzed from the distortion distributions. From the thus obtained error distribution, furthermore, distortion induced in imaging the object is estimated, and the distortion contained in the image that is reconstructed from the spin density of the object by the spin-warp method is corrected using the thus estimated value.

摘要翻译： 在使用所采用的旋转翘曲方法的NMR成像装置的梯度磁场中找到静态磁场中的误差分布和偏离直线偏差的方法。 在具有不同极性的读出梯度磁场中测量其形状已知的体模，以获得两个自旋密度分布图像。 然后将两个图像与所述体模的形状进行比较，以测量图像的失真分布。 从失真分布中分析静态磁场的误差和梯度磁场与直线的偏差。 此外，根据这样得到的误差分布，估计在物体成像时引起的失真，并且使用这样估计的值来校正通过旋转扭曲方法从物体的自旋密度重构的图像中包含的失真。

公开(公告)号：US4777443A

公开(公告)日：1988-10-11

申请号：US119489

申请日：1987-11-12

申请人： Masao Yabusaki ,  Etsuji Yamamoto ,  Takashi Onodera ,  Yukiko Ogura ,  Hideaki Nakane ,  Shigeru Matsui ,  Hideki Kohno

发明人： Masao Yabusaki ,  Etsuji Yamamoto ,  Takashi Onodera ,  Yukiko Ogura ,  Hideaki Nakane ,  Shigeru Matsui ,  Hideki Kohno

IPC分类号： G01R33/035 ,  G01R33/36 ,  G01R33/20

CPC分类号： G01R33/326 ,  G01R33/0358

摘要： Disclosed in a nuclear magnetic resonance (NMR) based inspection apparatus using an SQUID flux meter for detecting a small NMR signal, in which a receiving coil for receiving the NMR signal from an object is connected to a mixer, which mixes a reference high-frequency signal with the NMR signal so that the NMR signal is reduced to a low-frequency signal having a differential component of frequencies of both signals, and the low-frequency signal is applied to the input coil of the SQUID flux meter so that it is converted into a voltage signal. The mixer circuit includes Schottky diodes operative at a liquid helium temperature or Josephson junctions, and the portions of apparatus from the reception coil up to the SQUID flux meter are operated in a superconductive state at a liquid helium temperature.

摘要翻译： 在使用SQUID通量计检测小型NMR信号的基于核磁共振（NMR）的检查装置中公开了一种用于从物体接收NMR信号的接收线圈连接到混频器，该混频器将参考高频 用NMR信号进行信号，使得NMR信号被减少到具有两个信号的频率的差分分量的低频信号，并且低频信号被施加到SQUID通量计的输入线圈，使得其被转换 变成电压信号。 混频器电路包括以液氦温度或约瑟夫逊结操作的肖特基二极管，并且从接收线圈到SQUID通量计的装置部分在液氦温度下处于超导状态。

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。

公开(公告)号：US4625170A

公开(公告)日：1986-11-25

申请号：US635154

申请日：1984-07-27

申请人： Etsuji Yamamoto ,  Shigeru Matsui ,  Masuo Kuroda ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Shigeru Matsui ,  Masuo Kuroda ,  Hideki Kohno

IPC分类号： G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/48 ,  G01R33/565

CPC分类号： G01R33/56518

摘要： An NMR imaging method and apparatus of the type in which a 180-degree RF pulse is applied to generate a spin echo after the selective excitation of a spin by a 90-degree RF pulse. A dummy gradient field, which has the same direction and intensity as those of a gradient field to be applied when the spin echo is observed, is applied between said 90-degree RF pulse and said 180-degree RF pulse so that the instant of starting the application of the gradient field for signal observation is advanced to the extent corresponding to said dummy gradient field.

摘要翻译： 一种NMR成像方法和装置，其中施加180度RF脉冲以在旋转选择性激发90度RF脉冲之后产生自旋回波。 在所述90度RF脉冲和所述180度RF脉冲之间，施加与观察到自旋回波时要施加的梯度场相同的方向和强度的虚拟梯度场，使得起始时刻 将用于信号观察的梯度场的应用提前到对应于所述虚拟梯度场的程度。

公开(公告)号：US4472683A

公开(公告)日：1984-09-18

申请号：US420303

申请日：1982-09-20

申请人： Kensuke Sekihara ,  Etsuji Yamamoto ,  Hideki Kohno ,  Shinji Yamamoto

发明人： Kensuke Sekihara ,  Etsuji Yamamoto ,  Hideki Kohno ,  Shinji Yamamoto

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/54 ,  G01R33/08

CPC分类号： G01R33/4833

摘要： An imaging apparatus using nuclear magnetic resonance is disclosed in which both an image corresponding to the projection of a nuclear spin distribution in a to-be-inspected object on a two-dimensional plane and a display mark indicating a desired measuring position are displayed on a display face of a display device such as a CRT display, the display mark is freely moved on the display face to be set at a desired position on the display face, and magnetic field generating means for generating a static magnetic field, linear gradient field, or radio frequency magnetic field is controlled on the basis of the desired position of the display mark to obtain an image of that cross section of the object which is located at a position indicated by the display mark.

摘要翻译： 公开了一种使用核磁共振的成像装置，其中在二维平面上的被检查物体中的核自旋分布的投影和指示期望的测量位置的显示标记的图像都显示在 CRT显示器等显示装置的显示面，在显示面上自由移动显示标记，将其设定在显示面上的期望位置，产生静磁场，线性梯度场， 或者基于显示标记的期望位置来控制射频磁场，以获得位于由显示标记指示的位置处的对象的该横截面的图像。

公开(公告)号：US5107216A

公开(公告)日：1992-04-21

申请号：US473428

申请日：1990-02-01

申请人： Masao Yabusaki ,  Etsuji Yamamoto ,  Hiroyuki Takeuchi ,  Hideki Kohno

发明人： Masao Yabusaki ,  Etsuji Yamamoto ,  Hiroyuki Takeuchi ,  Hideki Kohno

IPC分类号： G01R33/32 ,  A61B5/055 ,  G01R33/343 ,  G01R33/36

CPC分类号： G01R33/3657 ,  G01R33/343

摘要： In an imaging apparatus using the nuclear magnetic resonance, a solenoid coil and a slot-resonator coil are combined with each other so as to constitute a quadrature-phase detection probe. In order to operate the slot-resonator coil at low frequency, inductance is added to the slot-resonator coil. Further in order to cut the coupling between a transmitting coil and a receiving coil in a cross coil system, a capacitor together with the added inductance to form a resonant circuit is connected in parallel to the inductance. A favorable probe can be obtained in a vertical-magnetic field type imaging apparatus.

摘要翻译： 在使用核磁共振的成像装置中，螺线管线圈和缝隙谐振器线圈彼此组合以构成正交相位检测探针。 为了以低频操作缝隙谐振器线圈，电感被加到缝隙谐振器线圈上。 此外，为了切断交叉线圈系统中的发送线圈和接收线圈之间的耦合，电容器与附加的电感一起形成谐振电路并联连接到电感。 可以在垂直磁场型成像装置中获得良好的探针。

公开(公告)号：US5065097A

公开(公告)日：1991-11-12

申请号：US500901

申请日：1990-03-29

申请人： Tatsuo Nozokido ,  Etsuji Yamamoto ,  Hideki Kohno

发明人： Tatsuo Nozokido ,  Etsuji Yamamoto ,  Hideki Kohno

IPC分类号： A61B5/055 ,  G01R33/48 ,  G01R33/485 ,  G01R33/565

CPC分类号： G01R33/56527 ,  G01R33/485

摘要： A testing method and apparatus by use of nuclear magnetic resonance measure, at timings influenced and not influenced from chemical shift, nuclear magnetic resonance signals taken from a sample to be tested at least one of whose values of permeability and chemical shift is known and a reference sample both of whose values of permeability and chemical shift and their spatial distribution are uniform thereby to acquire four items of image vector information. Further, the testing method and apparatus take phase differences between the items of image vector information to separately extract the phase component influenced by the permeability distribution and the phase component influenced from the chemical shift.

公开(公告)号：US4853636A

公开(公告)日：1989-08-01

申请号：US141788

申请日：1988-01-11

申请人： Etsuji Yamamoto ,  Yukiko Ogura ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Yukiko Ogura ,  Hideki Kohno

IPC分类号： G01R33/54

CPC分类号： G01R33/4833

摘要： An NMR imaging method for obtaining a tomographic image of an object through two-dimensional Fourier transformation imaging. After a whole image of a predetermined slice is displayed, a given field of view having a given size and located at a given position in the image is designated. On the basis of data derived from this designation, setting values for magnetic field generators and a signal detector are arithmetically determined for limiting the region in which the NMR signal is generated and the region to be imaged, whereby local imaging of the aforementioned field of view is conducted with high resolution. Further, division of an image resulting from the imaging operation is automatically corrected by exchanging positionally the divided image blocks with each other.

摘要翻译： 一种用于通过二维傅里叶变换成像获得物体的断层图像的NMR成像方法。 在显示预定切片的整个图像之后，指定具有给定尺寸并且位于图像中的给定位置的给定视场。 基于从该指定导出的数据，算术地确定用于限制产生NMR信号的区域和要成像的区域的磁场发生器和信号检测器的设定值，由此上述视野的局部成像 以高分辨率进行。 此外，通过将分割的图像块彼此交换而自动地校正由成像操作产生的图像的划分。

公开(公告)号：US4558425A

公开(公告)日：1985-12-10

申请号：US413821

申请日：1982-09-01

申请人： Etsuji Yamamoto ,  Kensuke Sekihara ,  Hideki Kohno ,  Shinji Yamamoto

发明人： Etsuji Yamamoto ,  Kensuke Sekihara ,  Hideki Kohno ,  Shinji Yamamoto

IPC分类号： A61B10/00 ,  A61B5/055 ,  A61B5/107 ,  G01R33/28 ,  G01R33/38 ,  G01R33/48 ,  G01R33/58 ,  G01N15/00

CPC分类号： G01R33/381 ,  A61B5/1077 ,  G01R33/28 ,  G01R33/58

摘要： In an imaging apparatus using nuclear magnetic resonance which includes apparatus for generating a static magnetic field, a linear gradient magnetic field and a radio frequency magnetic field, respectively, signal detection device for detecting the nuclear magnetic resonant signal from an object to be inspected, a computer for calculating from the detection signal an image and output device for displaying the result of calculation by the computer, the improvement wherein the size of the object to be inspected is detected by use of ultrasonic wave or light beams and a signal indicative of the detected size of the object is applied to the linear gradient magnetic field generation apparatus so as to control the intensity of the linear gradient magnetic field.

摘要翻译： 在使用核磁共振的成像装置中，分别包括用于产生静磁场的装置，线性梯度磁场和射频磁场，用于检测来自被检体的核磁共振信号的信号检测装置， 用于从检测信号计算用于显示计算机的计算结果的图像和输出装置的计算机，其中通过使用超声波或光束来检测要检查的对象的大小，以及指示检测到的信号的信号 物体的大小被施加到线性梯度磁场产生装置，以便控制线性梯度磁场的强度。