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。

公开(公告)号：US4437136A

公开(公告)日：1984-03-13

申请号：US389075

申请日：1982-06-16

申请人： Etsuji Yamamoto ,  Kensuke Sekihara ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Kensuke Sekihara ,  Hideki Kohno

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/389 ,  G05F7/00 ,  H01F5/00 ,  H01F7/18 ,  H01H47/00

CPC分类号： G05F7/00

摘要： An electromagnet having a current detecting device for detecting the current flowing through an electromagnet exciting coil, the output of which is utilized to control the power supplied to the coil to stabilize the current flowing through the coil; the electromagnet further including a separate power supply to supply current to the current detecting device which supplies current to the current detecting device when the electromagnet is not on working.

摘要翻译： 一种具有电流检测装置的电磁体，用于检测流过电磁激励线圈的电流，该电磁检测装置的输出用于控制提供给线圈的功率以稳定流经线圈的电流; 电磁体还包括单独的电源，以向电流检测装置提供电流，当电磁体不工作时，电流检测装置向电流检测装置提供电流。

公开(公告)号：US4760339A

公开(公告)日：1988-07-26

申请号：US944001

申请日：1986-12-22

申请人： Etsuji Yamamoto ,  Koichi Sano ,  Hidemi Shiono ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Koichi Sano ,  Hidemi Shiono ,  Hideki Kohno

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/485 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/565 ,  G01R33/485 ,  G01R33/56527

摘要： An NMR imaging method is disclosed in which an object is measured in accordance with a pulse sequence capable of expressing a difference between two of a plurality of chemical shifts by a phase difference in a signal, that is, a pulse sequence 90.degree.-.tau..sub.a -180.degree.-.tau..sub.b -spin echo (where .tau..sub.a .noteq..tau..sub.b) to obtain spin distribution data, a histogram with respect to the phase of the spin distribution data is formed to regard a phase corresponding to that one of a plurality of peaks of the histogram which exists at one end of the histogram, as a position-independent offset phase which is contained in the spin distribution data and is peculiar to an NMR imaging apparatus, and the spin distribution data is corrected using the offset value thus obtained, to extract spin density distribution data for each of the chemical shifts from the corrected spin distribution data.

摘要翻译： 公开了一种NMR成像方法，其中根据能够通过信号的相位差表示多个化学位移之间的差异的脉冲序列来测量物体，即脉冲序列90°-τa -180°-τb-自旋回波（其中τa NOTEQUAL tau b）为了获得自旋分布数据，形成相对于自旋分布数据的相位的直方图，以考虑与多个峰中的那一个相对应的相位 存在于直方图的一端的直方图作为自旋分布数据中包含的并且是NMR成像设备特有的与位置无关的偏移相位，并且使用由此获得的偏移值来校正自旋分布数据， 从校正的自旋分布数据中提取每个化学位移的自旋密度分布数据。

公开(公告)号：US4939463A

公开(公告)日：1990-07-03

申请号：US218694

申请日：1988-07-07

申请人： Kensuke Sekihara ,  Shigeru Matsui ,  Hideki Kohno

发明人： Kensuke Sekihara ,  Shigeru Matsui ,  Hideki Kohno

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/44 ,  G01R33/48 ,  G01R33/56 ,  G01R33/561

CPC分类号： G01R33/56554 ,  G01R33/56

摘要： A method wherein the requirement for the amplitude of the oscillating gradient magnetic field is relaxed by reconstructing an image while using simultaneously echoes S.sub.p (k.sub.x, y) produced in the case where the positive oscillating gradient magnetic field is applied to the object to be tested and echoes S.sub.N (k.sub.x, y) produced in the case where the negative is applied thereto, i.e. by using data points on segments of a trajectory of data points ascending from left to right in the spatial frequency domain and those on segments of a trajectory of data points ascending from right to left. That is, the image M(x, y) is obtained by Fourier-transforming at first the echoes S.sub.p (k.sub.x, k.sub.y) and S.sub.N (k.sub.x, k.sub.y) with respect to k.sub.y, multiplying complex numbers a.sub.1 and a.sub.2 to g.sub.p (k.sub.x, y) and g.sub.N (k.sub.x, y) obtained by this transformation; adding the results thus obtained, i.e. forming g(k.sub.x, y)=a.sub.1 g.sub.p (k.sub.x, y)+a.sub.2 g.sub.N (k.sub.x, y); and finally Fourier-transforming this g(k.sub.x, y) with respect to k.sub.x.

公开(公告)号：US4733188A

公开(公告)日：1988-03-22

申请号：US850113

申请日：1986-04-10

申请人： Kensuke Sekihara ,  Shigeru Matsui ,  Hideki Kohno

发明人： Kensuke Sekihara ,  Shigeru Matsui ,  Hideki Kohno

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/561 ,  G01R33/20

CPC分类号： G01R33/5615 ,  G01R33/5616

摘要： In imaging methods represented by the echo-planar method, i.e., in a method including a step of measuring the spin echos while applying a fixed gradient magnetic field to an object and applying a gradient field G.sub.Y periodically inverted in sense to the object and a step of obtaining the spin distribution image in the spatial domain by applying two-dimensional Fourier transform to the measured data, measurement is repeated a plurality of times while altering the phase of the applied waveform of G.sub.X, and the spin density image is derived by applying two-dimensional Fourier transform to a plurality of sets of data groups thus obtained.

摘要翻译： 在由回波平面方法表示的成像方法中，即在包括测量自旋回波的步骤的方法中，同时向对象施加固定的梯度磁场，并且向对象施加周期性反转的渐变场GY，并且步骤 通过对测量数据应用二维傅里叶变换获得空间域中的自旋分布图像，在改变GX的施加波形的相位的同时重复测量多次，并且通过应用两个方法导出自旋密度图像 维数傅里叶变换到由此获得的多组数据组。

公开(公告)号：US4727325A

公开(公告)日：1988-02-23

申请号：US919767

申请日：1986-10-16

申请人： Shigeru Matsui ,  Kensuke Sekihara ,  Hideki Kohno

发明人： Shigeru Matsui ,  Kensuke Sekihara ,  Hideki Kohno

IPC分类号： G01R33/54 ,  G01R33/561 ,  G01R33/20

CPC分类号： G01R33/54 ,  G01R33/5615 ,  G01R33/5616

摘要： An NMR imaging method using a rotating field gradient is disclosed in which transverse magnetization is prepared in a portion of an object to be inspected, by the 90.degree.-180.degree. RF pulse excitation, a rotating field gradient is generated to perform a sampling operation for an output signal in a state that the position of signal in a phase space is revolved, the intensity or rotational speed of the rotating field gradient is varied stepwise or continuously to obtain data arranged on concentric circles or a spiral in the phase space, and the data thus obtained undergoes Fourier transformation in each of a plurality of radial directions or two-dimensional Fourier transformation, to form an image of spin distribution.

摘要翻译： 公开了使用旋转磁场梯度的NMR成像方法，其中通过90°-180°RF脉冲激励在待测物体的一部分中制备横向磁化，产生旋转场梯度以执行采样操作 在相位空间中的信号的位置旋转的状态下的输出信号，旋转场梯度的强度或旋转速度逐步或连续地变化，以获得布置在相空间中的同心圆或螺旋上的数据，并且 由此获得的数据在多个径向方向或二维傅里叶变换中进行傅里叶变换，以形成自旋分布的图像。

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：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：US5109197A

公开(公告)日：1992-04-28

申请号：US578766

申请日：1990-09-07

申请人： Takashi Onodera ,  Hidemi Shiono ,  Hideki Kohno

发明人： Takashi Onodera ,  Hidemi Shiono ,  Hideki Kohno

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

CPC分类号： G01R33/56554

摘要： A nuclear magnetic resonance multi-echo imaging method and an apparatus therefor in which gradient field pulses having predetermined products of intensity and time are applied on both sides of an inversion pulse in at least two of three directions which are orthogonal to each other to dephase components of a magnetization vector which leads to an artifact signal and an error signal, whereby only a normal echo signal can be sampled to form a correct image.

公开(公告)号：US4672320A

公开(公告)日：1987-06-09

申请号：US600159

申请日：1984-04-13

申请人： Kensuke Sekihara ,  Masao Kuroda ,  Hideki Kohno

发明人： Kensuke Sekihara ,  Masao Kuroda ,  Hideki Kohno

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/385 ,  G01R33/387 ,  G01R33/3875 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/56563

摘要： An NMR imaging apparatus and method for direct Fourier imaging. This apparatus includes a static magnetic field generator, gradient magnetic field generators, high-frequency magnetic field generator, signal detecting detector for detecting a nuclear magnetic resonance signal from a body to be inspected, a computer for performing an arithmetic operation for the detected signal to obtain the nuclear magnetic resonance intensity distribution in the to-be-inspected body from measured values of the nuclear magnetic resonance intensity distribution at various points on a rectangular coordinate system in the Fourier space, and memories used for correction. In the imaging apparatus, that distortion of image data obtained by calculation from the detected signal which is caused by the deviation of the intensity of the static magnetic field from a predetermined value or the deviation of the intensity of a gradient magnetic field from a predetermined, linearly-varying intensity, is corrected by those measured values with respect to the above deviation of magnetic field intensity which are previously in the memory, and corrected image data is displayed on a display device.

摘要翻译： 用于直接傅里叶成像的NMR成像装置和方法。 该装置包括静态磁场发生器，梯度磁场发生器，高频磁场发生器，用于检测来自被检体的核磁共振信号的信号检测检测器，用于对检测信号执行算术运算的计算机 从傅立叶空间中的矩形坐标系上的各个点的核磁共振强度分布的测量值和用于校正的存储器中获得待检查体的核磁共振强度分布。 在成像装置中，通过由检测信号计算得到的图像数据的失真是由静磁场的强度与预定值的偏差或梯度磁场的强度的偏差相关联的， 线性变化强度通过相对于预先存储在存储器中的上述磁场强度偏差的那些测量值进行校正，校正后的图像数据被显示在显示装置上。