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    • 4. 发明授权
    • High speed imaging method with three-dimensional NMR
    • 高速成像方法采用三维NMR
    • US4716369A
    • 1987-12-29
    • US746663
    • 1985-06-20
    • Kensuke SekiharaShigeru MatsuiHideki KohnoEtsuji YamamotoHidemi Shiono
    • Kensuke SekiharaShigeru MatsuiHideki KohnoEtsuji YamamotoHidemi Shiono
    • G01R33/485G01R33/561G01R33/20
    • G01R33/485G01R33/5615G01R33/5616
    • The present invention is an imaging method using three-dimensional NMR to which an echo-planar method is applied. After excitation of nuclear spins, the gradient magnetic field Gx for phase-encoding is applied and there is repeated a sequence of measuring and obtaining an echo train of spin-echoes with a constant gradient magnetic field Gx and a periodically-inverted gradient magnetic field Gy, as varying the amount of encoding, so as to obtain the three-dimensional imaging by the Fourier-conversion. Moreover, after the selective excitation of spins within an X-Y surface, a 180.degree. radio frequency pulse is applied. As varying the time difference .tau..sub..epsilon. between the interval from the excitation until the application of the 180.degree. radio frequency pulse and the interval from the application thereof until a peak of a first echo of an echo train, three-dimensional imaging is carried out with a chemical shift axis as one axis by repeating the sequence and accomplishing Fourier-conversion with .tau..sub..epsilon. as a numerical variable.
    • 本发明是使用采用回波平面法的三维NMR的成像方法。 在激励核自旋之后,施加用于相位编码的梯度磁场Gx,并且重复测量并获得具有恒定梯度磁场Gx和周期性反转梯度磁场Gy的自旋回波回波序列的序列 ,因为改变编码量,从而通过傅里叶变换获得三维成像。 此外,在X-Y表面中的自旋选择性激发之后,施加180°射频脉冲。 随着从激励到施加180°射频脉冲的间隔与从应用到应用的间隔直到回波列的第一回波的峰值之间的时间差τεε改变,三维成像是 化学位移轴作为一个轴,通过重复该序列,并以tauε作为数值变量进行傅里叶变换。
    • 5. 发明授权
    • Method of measuring the static magnetic field distribution in an NMR
inspection system
    • 在NMR检查系统中测量静态磁场分布的方法
    • US4672318A
    • 1987-06-09
    • US696909
    • 1985-01-31
    • Kensuke SekiharaEtsuji YamamotoShigeru MatsuiHideki Kohno
    • Kensuke SekiharaEtsuji YamamotoShigeru MatsuiHideki Kohno
    • G01R33/20A61B5/055A61B10/00G01R33/24G01R33/38G01R33/387
    • G01R33/24
    • A method of measuring a static magnetic field distribution in a nuclear magnetic resonance (NMR) inspection system which comprises magnetic field generator for producing a static magnetic field, inclination or gradient magnetic fields and a high-frequency magnetic field, a signal detector for sensing nuclear magnetic resonance signals from an inspection sample, a computer for processing output signals from the signal detector and an output device for providing a computational result of the computer, wherein a time interval t.sub.1 from the center of a 90.degree.-pulse high-frequency magnetic field to the center of a 180.degree.-pulse high-frequency magnetic field is made different by a time difference t.sub.0 from a time interval t.sub.2 from the center of the 180.degree.-pulse high-frequency magnetic field to a peak of a spin echo, so that static magnetic field distribution is calculated based on the computer output which corresponds to the difference of the two time intervals.
    • 一种在核磁共振(NMR)检查系统中测量静磁场分布的方法,其包括用于产生静磁场,倾斜或梯度磁场和高频磁场的磁场发生器,用于感测核的信号检测器 来自检查样本的磁共振信号,用于处理来自信号检测器的输出信号的计算机和用于提供计算机的计算结果的输出装置,其中从90°脉冲高频磁场的中心起的时间间隔t1 从180°脉冲高频磁场的中心到从180°脉冲高频磁场的中心到自旋回波的峰值的时间间隔t2由时间差t0变化到180°脉冲高频磁场的中心,因此 基于对应于两个时间间隔的差的计算机输出来计算静态磁场分布。
    • 6. 发明授权
    • Method of measuring magnetic field error of an NMR imaging apparatus and
of correcting distortion caused by the error
    • 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
    • US4791369A
    • 1988-12-13
    • US72035
    • 1987-07-10
    • Etsuji YamamotoHideki Kohno
    • Etsuji YamamotoHideki Kohno
    • A61B5/055A61B10/00G01R33/24G01R33/48G01R33/565G01R33/20
    • G01R33/24G01R33/56563G01R33/56518
    • 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.
    • 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。
    • 10. 发明授权
    • NMR imaging method
    • NMR成像方法
    • US4739265A
    • 1988-04-19
    • US846151
    • 1986-03-31
    • Etsuji YamamotoKensuke SekiharaHidemi ShionoHideki Kohno
    • Etsuji YamamotoKensuke SekiharaHidemi ShionoHideki Kohno
    • G01R33/485G01R33/565G01R33/20
    • G01R33/565G01R33/485G01R33/56527
    • 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.
    • 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。