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1. 发明授权

US4875010A Circuit for detecting AC magnetic field due to magnetic resonance with a variable resistance for noise suppression 失效
标题翻译：用于通过可变电阻检测由于磁共振引起的交流磁场的噪声抑制电路
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。

2. 发明授权

US4777443A Inspection apparatus based on nuclear magnetic resonance 失效
标题翻译：基于核磁共振的检测装置
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。

3. 发明授权

US4853636A NMR imaging method 失效
标题翻译： NMR成像方法
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。

4. 发明授权

US5426365A Method and system for determining electromotive force or impressed current distribution in an object based on magnetic field distribution measured outside the object 失效
标题翻译：基于在物体外部测量的磁场分布来确定物体中的电动势或外加电流分布的方法和系统
公开(公告)号：US5426365A
公开(公告)日：1995-06-20
申请号：US13425
申请日：1993-02-04
申请人： Kensuke Sekihara , Yukiko Ogura
发明人： Kensuke Sekihara , Yukiko Ogura
IPC分类号： A61B5/05 , A61B5/04 , A61B5/053 , G01R33/00 , G01R33/02 , G01R33/035 , G01R33/10
CPC分类号： G01R33/02 , A61B5/04008 , A61B5/0536
摘要： In a magnetic field generation source measuring method and system for determining a magnetic field generation source in an object to be examined from a magnetic field in the interior of the object measured at the exterior of the object, the object is represented by a model in which the object is divided into a plurality of cells. The resistance values of each cell in x, y and z directions are determined from information concerning the electric conductivity of the interior of the object beforehand measured. Supposing the distribution of electromotive forces in the object as a current source, a return current generated in accordance with the electromotive force distribution in the object is determined by use of estimated values of the intensities of the current source in the x, y and z directions and the resistance values. A vector of the sum of a current of the current source and the return current is determined for all of the cells. The second power of the absolute value of a difference between the vector of the sum and a current vector determined from the magnetic field in the interior of the object measured at the exterior of the object is subjected to summation for all of the cells. The estimated values of the current source intensities, which minimize the summation, are determined as an electromotive force distribution in the object.
摘要翻译：在用于在物体外部测量的物体内部的磁场中确定待检测物体中的磁场产生源的磁场产生源测量方法和系统中，该对象由以下模型表示：其中，该对象被分成多个单元。 x，y和z方向上的每个单元的电阻值由预先测量的物体内部的电导率的信息确定。假设物体中的电动势作为电流源的分布，通过使用x，y和z方向上的电流源的强度的估计值来确定根据物体中的电动势分布产生的返回电流和电阻值。为所有单元确定电流源的电流和返回电流之和的向量。在对象外部测量的对象内部的磁场确定的和矢量的矢量和当前矢量之间的差的绝对值的第二功率对所有单元进行求和。将求和的最小值的电流源强度的估计值确定为物体中的电动势分布。

5. 发明授权

US5276574A Magnetic head 失效
标题翻译：磁头
公开(公告)号：US5276574A
公开(公告)日：1994-01-04
申请号：US744515
申请日：1991-08-13
申请人： Mitsuo Abe , Yukiko Ogura , Masakatsu Saito , Toshio Tsuchiya
发明人： Mitsuo Abe , Yukiko Ogura , Masakatsu Saito , Toshio Tsuchiya
IPC分类号： G11B5/127 , G11B5/187 , G11B5/31 , G11B5/255
CPC分类号： G11B5/3106 , G11B5/1871 , G11B5/1878
摘要： Disclosed herein is a magnetic head in which the sliding surface is constructed of a transducing gap, a pair of soft magnetic metal films opposite to each other through the transducing gap, and a substrate holding the soft magnetic metal film. The substrate is 20-200 times as wear-resistant as the soft magnetic metal film. The magnetic head has a gap depth of 1-5 .mu.m and produces an overall high head output.
摘要翻译：这里公开了一种磁头，其中滑动表面由换能间隙，通过换能间隙彼此相对的一对软磁金属膜构成，以及保持软磁金属膜的基板。基材的耐磨性为软磁金属膜的20-200倍。磁头的间隙深度为1-5（my）m，产生一个整体较高的磁头输出。

6. 发明授权

US5243984A Method and apparatus for determining biocurrent distribution within subject 失效
标题翻译：用于确定主体内生物流分布的方法和装置
公开(公告)号：US5243984A
公开(公告)日：1993-09-14
申请号：US928782
申请日：1992-08-13
申请人： Yukiko Ogura , Kensuke Sekihara , Hisaaki Ochi
发明人： Yukiko Ogura , Kensuke Sekihara , Hisaaki Ochi
IPC分类号： A61B5/04 , A61B5/0402 , A61B5/0476 , A61B5/0488 , G01N27/00 , G01N27/72 , G06F17/00 , G06K9/00
CPC分类号： G06K9/0057 , A61B5/04005 , A61B5/0476
摘要： A living body is replaced by a 3-D network. Admittance connected to lines forming the 3-D network is calculated. Position rt and magnitude qt=(jtx,jty,jtz) of a current dipole are assumed, and current sources jtx, jty and jtz are connected in parallel with lines coupled to a node. Node equations are formulated, and an admittance matrix Y is derived. An inverse matrix Y' of Y is calculated, and body surface potential generated by the current sources is calculated by using the inverse matrix Y'. Then, rt and qt minimizing cost function which is sum total of squares of differences between measured values of body surface potential and the above described calculated values for all measuring points are derived. Thereby potential distribution on the body surface can be calculated with due regard to the shape of the living body and conductivity distribution in the living body on the basis of the assumed current dipole. On the basis of measured data of potential distribution on the body surface, therefore, the position and magnitude of the current dipole can be estimated with high precision.

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