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：US4875010A

公开(公告)日：1989-10-17

申请号：US174424

申请日：1988-03-28

申请人： Koichi Yokosawa ,  Etsuji Yamamoto ,  Hideaki Nakane ,  Masao Yabusaki ,  Yukiko Ogura

发明人： Koichi Yokosawa ,  Etsuji Yamamoto ,  Hideaki Nakane ,  Masao Yabusaki ,  Yukiko Ogura

IPC分类号： A61B5/055 ,  A61B10/00 ,  G01R33/035 ,  G01R33/32 ,  G01R33/36

CPC分类号： G01R33/326 ,  G01R33/0358

摘要： In a signal detecting circuit of, for example, an NMR apparatus, a signal transmission path transmits an AC magnetic flux signal to be superposed on a DC magnetic field whose strength does not change with time during a period of signal detection. The signal transmission path comprises a superconducting closed loop including a receiving coil receiving the AC magnetic flux signal, an input coil applying the received AC magnetic flux signal as an input to a flux meter, and a variable resistor replacing part of the superconducting closed loop and having its resistance value changed in relation to a change in the strength of the DC magnetic field.

摘要翻译： 在例如NMR装置的信号检测电路中，在信号检测期间，信号传输路径传输要叠加在强度不随时间变化的直流磁场上的交流磁通信号。 信号传输路径包括超导闭环，包括接收交流磁通信号的接收线圈，输入线圈将接收到的交流磁通信号作为输入馈送到通量计，以及替代部分超导闭环的可变电阻器，以及 其电阻值相对于直流磁场强度的变化而变化。

公开(公告)号：US5109198A

公开(公告)日：1992-04-28

申请号：US469916

申请日：1990-01-24

申请人： Yoshiki Murakami ,  Etsuji Yamamoto ,  Masao Yabusaki ,  Hideki Kohno ,  Munetaka Tsuda ,  Toshihiro Ishizuka

发明人： Yoshiki Murakami ,  Etsuji Yamamoto ,  Masao Yabusaki ,  Hideki Kohno ,  Munetaka Tsuda ,  Toshihiro Ishizuka

IPC分类号： G01R33/34

CPC分类号： G01R33/34046

摘要： In a nuclear magnetic resonance imaging apparatus including a first probe circuit for detecting magnetic flux in a first direction and a second probe circuit for detecting magnetic flux in a direction perpendicular to the first direction, the arm angle of conductor arms to form the first probe circuit and the arm angle of conductor arms to form the second probe circuit are different from each other.

摘要翻译： 在包括用于检测第一方向的磁通的第一探针电路和用于检测与第一方向垂直的方向上的磁通的第二探针电路的核磁共振成像装置中，形成第一探针电路的导体臂的臂角 并且形成第二探针电路的导体臂的臂角彼此不同。

公开(公告)号：US4875013A

公开(公告)日：1989-10-17

申请号：US162982

申请日：1988-03-02

申请人： Yoshiki Murakami ,  Etsuji Yamamoto ,  Masao Yabusaki ,  Hideki Kohno

发明人： Yoshiki Murakami ,  Etsuji Yamamoto ,  Masao Yabusaki ,  Hideki Kohno

IPC分类号： G01R33/343

CPC分类号： G01R33/343

摘要： A high-frequency coil of the type of slot resonator in which outer conductors that have wing portions at both ends thereof and that are divided, are formed on the cylindrical surface, and ring-like inner conductors are formed on the inside of the wing portions. The wing portions have a width different from the width of the inner conductors. The self resonance frequency of the coil is adjusted by adjusting the width which is smaller than the other width. Further, the neighboring tips of the wing portions are opposed to each other via an air gap. The self resonance frequency is also adjusted depending upon the position of the dielectric plate inserted in the gap.

摘要翻译： 在圆筒形表面上形成有槽谐振器类型的高频线圈，其中在其两端具有翼部并被分割的外导体，并且在翼部的内侧形成有环形的内导体 。 翼部的宽度不同于内导体的宽度。 通过调节小于另一个宽度的宽度来调节线圈的自谐振频率。 此外，翼部的相邻端部经由气隙彼此相对。 自谐振频率也根据插入间隙中的电介质板的位置来调节。

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：US4929881A

公开(公告)日：1990-05-29

申请号：US356423

申请日：1989-05-25

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： A61B10/00 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36

CPC分类号： G01R33/34046 ,  G01R33/3628 ,  G01R33/3657

摘要： There is provided a probe to detect a nuclear magnetic resonance signal in which each of a plurality of arms forming a current path of an Alderman-Grant type coil is divided into two conductor plates, the two conductor plates are connected by an inductor, and a resonance frequency is reduced by increasing the inductance of the current path.

摘要翻译： 提供了一种用于检测核磁共振信号的探针，其中形成Alderman-Grant型线圈的电流路径的多个臂中的每一个被分成两个导体板，两个导体板通过电感器连接， 通过增加电流路径的电感来减小谐振频率。

公开(公告)号：US4825163A

公开(公告)日：1989-04-25

申请号：US225781

申请日：1988-07-29

申请人： Masao Yabusaki ,  Etsuji Yamamoto ,  Yoshiki Murakami ,  Hideki Kohno

发明人： Masao Yabusaki ,  Etsuji Yamamoto ,  Yoshiki Murakami ,  Hideki Kohno

IPC分类号： G01R33/34 ,  G01R33/341 ,  G01R33/20

CPC分类号： G01R33/3678 ,  G01R33/34076 ,  G01R33/422

摘要： A quadrature probe for nuclear magnetic resonance includes two sets of coils which are combined with an angle of 90.degree. therebetween. Four pieces of outer conductors and two pieces of ring-shaped inner conductors are capacitively coupled to each other through an insulator or an air gap. In the outer conductor(s) in at least one of a set of outer conductors disposed at positions symmetrical with respect to each other so as to form a first coil and a set of outer conductors disposed at positions symmetrical with respect to each other so as to form a second coil, a conductor member(s) for adjustment is attached in parallel to the arm portion(s) in that outer conductor(s) of that set. Alternatively, the arm portion(s) itself in that set is slidably attached to the wing portions in that set.

摘要翻译： 用于核磁共振的正交探针包括两组线圈，它们之间的角度为90°。 四条外导体和两片环形内导体通过绝缘体或气隙彼此电容耦合。 在设置在彼此对称的位置的一组外部导体中的至少一个中的外部导体中，以形成设置在彼此对称的位置处的第一线圈和一组外部导体，以便 为了形成第二线圈，用于调节的导体构件平行于该组的外导体中的臂部附接。 或者，该组中的臂部分本身可滑动地附接到该组中的翼部。

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：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。