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11. 发明授权

US4727325A NMR imaging method 失效
标题翻译： NMR成像方法
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。

12. 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。

13. 发明授权

US4683433A Imaging method and apparatus using nuclear magnetic resonance 失效
标题翻译：使用核磁共振的成像方法和装置
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。

14. 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。

15. 发明授权

US4211926A Tomographic imaging system 失效
标题翻译：断层成像系统
公开(公告)号：US4211926A
公开(公告)日：1980-07-08
申请号：US901241
申请日：1978-04-28
申请人： Chitose Nakaya , Hideki Kohno , Hidemi Shiono , Kensuke Sekihara , Shinji Yamamoto , Teruichi Tomura , Takayuki Hayakawa
发明人： Chitose Nakaya , Hideki Kohno , Hidemi Shiono , Kensuke Sekihara , Shinji Yamamoto , Teruichi Tomura , Takayuki Hayakawa
IPC分类号： G01N23/04 , A61B6/03 , A61B8/00 , G06Q50/22 , G06Q50/24 , G06T11/00 , G03B41/16
CPC分类号： A61B6/032
摘要： In a system in which the tomographic image of an object under investigation is produced on the basis of the amount of absorption of radiation by the object when a source of radiation and a plurality of radiation sensitive detectors with the object interposed therebetween are rotated around the object, the output signal from at least one of the plural detectors is used to correct the radiation absorption amount. Another selected one of the plural detectors may be used for checking whether the object is positioned within a useful detection view.
摘要翻译：在这样一个系统中，在被照明物体插入其间的物体的多个辐射敏感探测器围绕物体旋转时，基于物体的辐射吸收量产生被研究对象的断层图像使用来自多个检测器中的至少一个的输出信号来校正辐射吸收量。多个检测器中的另一选择的一个可以用于检查对象是否位于有用的检测视图内。

16. 发明授权

US4485480A Radiation image photographing apparatus 失效
标题翻译：辐射摄影装置
公开(公告)号：US4485480A
公开(公告)日：1984-11-27
申请号：US366781
申请日：1982-04-08
申请人： Hideki Kohno , Hidemi Shiono , Kensuke Sekihara , Shigenobu Yanaka , Takaji Suzuki
发明人： Hideki Kohno , Hidemi Shiono , Kensuke Sekihara , Shigenobu Yanaka , Takaji Suzuki
IPC分类号： G01N23/04 , A61B6/00 , A61B6/02 , H05G1/60 , G03B41/16
CPC分类号： A61B6/4476 , H05G1/60
摘要： A radiation-image photographing apparatus comprises a radiation source, a radiation detector disposed in opposition to the radiation source for detecting radiation through an object to be examined and to generate an electrical signal proportional to the amount of incident radiation, a scanning device for changing the relative, positional relationship between the radiation source and the radiation detector, an analog-to-digital converter for converting the output signal from the radiation detector to a digital quantity, a memory for storing the digital signal, an arithmetic unit, and a display unit. A plurality of measurements of a two-dimensional radiation absorption distribution of the object disposed between the radiation source and the radiation detector is obtained while the relative positional relationship between the radiation source and the radiation detector is being changed, and a linear arithmetic operation is performed on the plurality of image measurements, or a set of data passing a point within the object to be photographed, thereby displaying a cross-sectional image on a given cross-section approximately parallel to the radiation detector plane within the object to be examined.
摘要翻译：辐射图像拍摄装置包括辐射源，与辐射源相对设置的放射线检测器，用于检测通过待检查物体的辐射并产生与入射辐射量成比例的电信号;扫描装置，用于改变辐射源和辐射检测器之间的相对位置关系，用于将来自辐射检测器的输出信号转换为数字量的模拟 - 数字转换器，用于存储数字信号的存储器，运算单元和显示单元。在辐射源和辐射检测器之间的相对位置关系正在改变的同时，获得放置在辐射源和放射线检测器之间的物体的二维辐射吸收分布的多个测量值，并进行线性算术运算或多个图像测量中的一组数据，或者通过要拍摄的对象内的点的一组数据，从而在与被检查对象内的放射线检测器平面近似平行的给定横截面上显示横截面图像。

17. 发明授权

US4672320A Imaging apparatus and method using nuclear magnetic resonance 失效
标题翻译：使用核磁共振的成像装置和方法
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。

18. 发明授权

US4625171A Imaging apparatus using nuclear magnetic resonance 失效
标题翻译：使用核磁共振成像设备
公开(公告)号：US4625171A
公开(公告)日：1986-11-25
申请号：US579967
申请日：1984-02-14
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 , G01R33/565 , G06T1/00 , G01R33/20
CPC分类号： G01R33/56563 , G01R33/56518
摘要： An NMR imaging apparatus for reconstructing a cross section of a body to be inspected, by the projection-reconstruction method. That is, an apparatus for forming the above cross section in such a manner that the nuclear magnetic resonance is caused by the to-be-inspected body in the resulting magnetic field of a static magnetic field and a rotatable gradient field, a projection of the to-be-inspected body is detected at each rotational positions of the gradient field, and the cross section is reconstructed using the above projection. The apparatus comprises memories for previously storing therein data indicating the distorsion of magnetic field such as the non-uniformity of the static magnetic field and the non-linearity of the gradient field, in order to perform the coordinate calculation in the back projection, using the data stored in the memories.
摘要翻译：一种用于通过投影重建方法重建被检体的横截面的NMR成像装置。也就是说，一种用于形成上述横截面的装置，使得核磁共振是在静磁场和可旋转梯度场的所得磁场中被被检查体引起的，在梯度场的每个旋转位置处检测被检查体，并且使用上述投影重建横截面。该装置包括用于预先存储表示磁场变形的数据的存储器，例如静态磁场的不均匀性和梯度场的非线性度，以便在后投影中执行坐标计算，使用存储在存储器中的数据。

19. 发明授权

US4212062A Tomographic imaging system 失效
标题翻译：断层成像系统
公开(公告)号：US4212062A
公开(公告)日：1980-07-08
申请号：US919627
申请日：1978-06-27
申请人： Hideki Kohno , Hidemi Shiono , Chitose Nakaya , Kensuke Sekihara , Teruichi Tomura , Shinji Yamamoto , Takayuki Hayakawa , Isao Horiba , Shigenobu Yanaka
发明人： Hideki Kohno , Hidemi Shiono , Chitose Nakaya , Kensuke Sekihara , Teruichi Tomura , Shinji Yamamoto , Takayuki Hayakawa , Isao Horiba , Shigenobu Yanaka
IPC分类号： G01N23/04 , A61B6/03 , G06Q50/22 , G06Q50/24 , G06T11/00 , G06F15/34
CPC分类号： A61B6/032 , G06T11/006 , Y10S378/901
摘要： A tomographic imaging system is disclosed in which the quantity of absorption or transmittance of a transmissive radiation by or through a certain tomographic cross-section of an object under consideration is detected and the distribution of radiation absorption or transmittance in the cross-section is reconstructed through a convolution operation. A weighting function used in the convolution operation is prepared with a predetermined one of its positive orders the value of which is an integration of the weighting function from the predetermined positive order to positive infinity and a predetermined one of its negative orders the value of which is in integration of the weighting function from the predetermined negative order to negative infinity.
摘要翻译：公开了一种断层图像成像系统，其中检测由所考虑的物体的特定断层摄影横截面或通过所考虑的物体的某些断层摄影横截面的透射辐射的吸收或透射率，并且通过以下方式重建横截面中的辐射吸收或透射率的分布：卷积运算在卷积运算中使用的加权函数以其正值中的预定的一个准备，该值的正值为加权函数从预定的正阶数到正无穷大的积分，以及负值的预定值，其值是将加权函数从预定的负数整合到负无穷大。

20. 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。

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