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。

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：US4739265A

公开(公告)日：1988-04-19

申请号：US846151

申请日：1986-03-31

申请人： Etsuji Yamamoto ,  Kensuke Sekihara ,  Hidemi Shiono ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Kensuke Sekihara ,  Hidemi Shiono ,  Hideki Kohno

IPC分类号： G01R33/485 ,  G01R33/565 ,  G01R33/20

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

摘要： A method for providing spin density distribution images of an object, discriminated with respect to plural chemical shifts. This method is performed by repeating a measurement sequence in a spin warp imaging method, of the spin data plural times, with a time difference .DELTA..tau. between a time interval .tau..sub.1 from spin excitation to a 180.degree. RF pulse and a time interval .tau..sub.2 from the 180.degree. RF pulse to a peak of a spin echo, altering .DELTA..tau. in the ways corresponding the number of chemical shifts to be discriminated from one another, subjecting the respective spin data to two-dimensional Fourier transform to provide plural sets of spin data for respective coordinates in a spatial domain, and solving simultaneous equations of the sets of spin data to provide spin densities corresponding to the respective chemical shifts.

摘要翻译： 一种用于提供对象的自旋密度分布图像的方法，其被鉴别为多个化学位移。 该方法通过在旋转数据成像方法中重复自旋数据多次的测量序列，其中从自旋激发到180°RF脉冲的时间间隔τ1与时间间隔τ2之间的时间差DELTAτ 从180°RF脉冲到自旋回波的峰值，以相应于要彼此区分的化学位移数的方式改变DELTA tau，对各自旋转数据进行二维傅里叶变换以提供多组旋转 用于空间域中的各个坐标的数据，以及求解自旋数据组的联立方程以提供对应于各个化学位移的自旋密度。

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。

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。

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。

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：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。

公开(公告)号：US4752735A

公开(公告)日：1988-06-21

申请号：US946957

申请日：1986-12-29

申请人： Takashi Onodera ,  Shigeru Matsui ,  Hideki Kohno

发明人： Takashi Onodera ,  Shigeru Matsui ,  Hideki Kohno

IPC分类号： A61B5/055 ,  A61B10/00 ,  G01R33/24 ,  G01R33/387 ,  G01R33/565 ,  G01R33/20

CPC分类号： G01R33/56518 ,  G01R33/24

摘要： Method for measuring the time dependence of an oscillating field gradient and representatively its integral function with respect to time for imaging method using the field gradient such as rapid chemical shift imaging method echo planar method, etc. A uniform specimen is placed within a coil of an NMR device, in which nuclear spins are excited; a phase encoding field gradient is applied thereto; and signals are sampled under application of the field gradient to be measured. These steps are repeated and an integral function of the field gradient with respect to time is obtained by using the peak position in the series of data obtained by this repetition.

摘要翻译： 用于使用诸如快速化学位移成像方法回波平面法等场梯度的成像方法来测量振荡场梯度的时间依赖性和代表性的其积分函数的方法。将均匀的样本放置在 其中核自旋激发的NMR装置; 应用相位编码场梯度; 并且在应用待测量的场梯度下对信号进行采样。 重复这些步骤，通过使用通过该重复获得的一系列数据中的峰值位置获得相对于时间的场梯度的积分函数。