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21. 发明授权

US4791369A Method of measuring magnetic field error of an NMR imaging apparatus and of correcting distortion caused by the error 失效
标题翻译：测量NMR成像设备的磁场误差并校正由误差引起的失真的方法
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。

22. 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。

23. 发明授权

US4625170A NMR imaging method and apparatus 失效
标题翻译： NMR成像方法和装置
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。

24. 发明授权

US5107216A Nuclear magnetic resonance imaging apparatus 失效
标题翻译：核磁共振成像装置
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。

25. 发明授权

US5065097A Testing method and apparatus by use of NMR 失效
标题翻译：使用NMR测试方法和装置
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.

26. 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。

27. 发明授权

US5195524A Flow imaging method by means of an MRI apparatus and apparatus for realizing same 失效
标题翻译：通过MRI装置和实现其的装置的流动成像方法
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。

28. 发明授权

US5162737A Multi-echo NMR imaging method 失效
标题翻译：多回波核磁共振成像方法
公开(公告)号：US5162737A
公开(公告)日：1992-11-10
申请号：US807625
申请日：1991-12-13
申请人： Tatsuo Nozokido , Etsuji Yamamoto , Hideki Kohno
发明人： Tatsuo Nozokido , Etsuji Yamamoto , Hideki Kohno
IPC分类号： G01R33/485 , G01R33/54 , G01R33/565
CPC分类号： G01R33/4828 , G01R33/485 , G01R33/56563
摘要： A multi-echo NMR imaging method of obtaining images separated from each other with respect to two kinds of chemical shifts, typically, a fat image and a water image, includes performing the measurement of an object to be examined through a multi-echo sequence in which phase differences of .theta..sub.1 .noteq.n.pi. and .theta..sub.2 =2n.pi. (n=.+-.1, .+-.2, ---) are respectively produced for first and second echoes between two kinds of spins to be separated from each other, deriving first and second complex images of the object from the first and second echoes, respectively, performing the measurement of a phantom exhibiting one of the chemical shifts through the multi-echo sequence and deriving third and fourth complex images of the phantom, eliminating phase errors due to a static magnetic field inhomogeneity from the first and second images using phase data of the third and fourth images respectively, and eliminating phase error due to a magnetic permeability distribution to the object.
摘要翻译：一种多回波核磁共振成像方法，通过多个回波序列来获得相对于两种化学位移（通常为脂肪图像和水分图像）彼此分离的图像，包括：分别产生用于从每一个分离出的两种旋转之间的第一和第二回波的θ1的相位差分别为n pi和theta 2 = 2n pi（n = + / - 1，+/- 2，...）另外，分别从第一和第二回波导出对象的第一和第二复合图像，执行通过多回波序列显示化学位移之一的体模的测量，并导出体模的第三和第四复合图像，消除分别使用第三和第四图像的相位数据从第一和第二图像的静态磁场不均匀性引起的相位误差，并消除由于对物体的磁导率分布引起的相位误差。

29. 发明授权

US5045791A Nuclear magnetic resonance imaging method 失效
标题翻译：核磁共振成像法
公开(公告)号：US5045791A
公开(公告)日：1991-09-03
申请号：US492121
申请日：1990-03-13
申请人： Etsuji Yamamoto , Hideki Kohno
发明人： Etsuji Yamamoto , Hideki Kohno
IPC分类号： A61B5/055 , G01R33/48 , G01R33/54 , G01R33/561
CPC分类号： G01R33/561 , G01R33/54
摘要： A three-dimensional NMR imaging method using phase encoding field gradients along two direction is disclosed. The measurement of an NMR signal is repeated in such a manner that among all combinations of a plurality of magnitudes of gradient prepared for the phase encoding field gradient along one of the two directions and a plurality of magnitudes of gradient prepared for the phase encoding field gradient along the other direction, combinations in which the magnitude of the phase encoding field gradient along the one direction is not larger than a predetermined value, are selected preceding the remaining combinations. A first image reconstruction processing is performed for data trains acquired on the basis of the precedently selected combinations, thereby obtaining a crude image. The crude image is displayed to confirm whether the location of measurement is proper or not. After the confirmation, the remaining combinations are successively selected to continue the measurement of the NMR signal and a second image reconstruction processing is performed for all of data trains acquired, thereby obtaining a detailed image.
摘要翻译：公开了使用沿两个方向的相位编码场梯度的三维NMR成像方法。 NMR信号的测量以这样的方式重复：在沿着两个方向中的一个方向为相位编码场梯度准备的多个梯度大小的所有组合和为相位编码场梯度准备的多个梯度的量值沿着另一方向，在剩余组合之前选择其中沿着一个方向的相位编码场梯度的幅度不大于预定值的组合。对基于先前选择的组合获取的数据列执行第一图像重构处理，从而获得粗图像。显示粗图像以确认测量位置是否适当。在确认之后，依次选择剩余的组合以继续NMR信号的测量，并对所获取的所有数据列执行第二图像重建处理，从而获得详细的图像。

30. 发明授权

US5032793A NMR gated imaging apparatus 失效
标题翻译： NMR门控成像装置
公开(公告)号：US5032793A
公开(公告)日：1991-07-16
申请号：US478739
申请日：1990-02-09
申请人： Etsuji Yamamoto , Hiroshi Kanda , Hideki Kohno
发明人： Etsuji Yamamoto , Hiroshi Kanda , Hideki Kohno
IPC分类号： A61B5/055 , A61B8/08 , G01R33/28 , G01R33/385 , G01R33/567 , G01S15/02
CPC分类号： G01R33/5673 , A61B5/055 , A61B5/7285 , A61B8/08 , G01R33/28 , G01R33/385 , G01S15/025
摘要： Disclosed is an NMR gated imaging apparatus in which an ultrasonic pulse signal is repeatedly transmitted toward the heart of a human body from an ultrasonic transducer to detect the position of the heart on the basis of the time of detection of a peak of an echo signal, and excitation and measurement of an NMR signal are executed only when a peak detector generates a detection output signal having a level included in a predetermined range. Thus, the NMR signal is repeatedly measured according to a programmable phase encoding amount at a limited phase of gated imaging.
摘要翻译：公开了一种NMR门控成像装置，其中超声脉冲信号从超声换能器重复地向人体的心脏发送，以根据检测到回波信号的峰值的时间来检测心脏的位置，只有当峰值检测器产生具有包括在预定范围内的电平的检测输出信号时，才执行NMR信号的激发和测量。因此，根据在门控成像的有限阶段的可编程相位编码量重复测量NMR信号。

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