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。

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。

公开(公告)号：US4959613A

公开(公告)日：1990-09-25

申请号：US319728

申请日：1989-03-07

申请人： Etsuji Yamamoto ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Hideki Kohno

IPC分类号： G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/38 ,  G01R33/385

CPC分类号： G01R33/385

摘要： A field gradient generator in an NMR imaging apparatus comprises three sets of field gradient generating coils for respectively generating field gradients in three orthogonal directions in a space to be observed. Each set of coils includes a plurality of unit coils through which individual currents respectively flow. There are prepared a plurality of unit drivers which are for exclusive uses of the respective unit coils or are connected arbitrarily to each unit coil. Thereby, the lowering of an allowable operating voltage is implemented by use of a parallel operation of the unit drivers.

摘要翻译： NMR成像装置中的场梯度发生器包括三组场梯度产生线圈，用于分别在要观察的空间中的三个正交方向上产生场梯度。 每组线圈包括多个单独的线圈，各个电流分别通过该线圈流动。 准备了用于各单元线圈的专用的多个单元驱动器或者任意地连接到每个单元线圈。 因此，通过使用单元驱动器的并行操作来实现允许工作电压的降低。

公开(公告)号：US4740749A

公开(公告)日：1988-04-26

申请号：US56951

申请日：1987-06-03

申请人： Etsuji Yamamoto ,  Hideki Kohno

发明人： Etsuji Yamamoto ,  Hideki Kohno

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/32 ,  G01R33/48 ,  G01R33/54 ,  G01R33/56 ,  G06T1/00 ,  G01R33/20

CPC分类号： G01R33/482 ,  G01R33/56

摘要： In an imaging method called spin warp method in which a measuring sequence inclusive of nuclear spin excitation, application of phase-encoding gradient field, and measurement of NMR signals under the application of read-out gradient field, is repeated while changing the phase-encoding amount, and a data train thus obtained is subjected to the two-dimensional inverse Fourier transformation to reconstruct a magnetization distribution image of an object, wherein an NMR imaging method is characterized in that measurement of NMR signals is repeated a plural number of times for a particular phase-encoding amount only among many phase-encoding amounts, a plurality of NMR signals thus obtained are added up together and are averaged, and the data obtained by the addition and averaging is subjected to the two-dimensional inverse Fourier transformation.

摘要翻译： 在改变相位编码的同时，重复在包括核自旋激发，包含相位编码梯度场的测量序列和读出梯度场应用中的NMR信号测量的称为自旋翘曲方法的成像方法中 数量和这样获得的数据序列进行二维傅立叶逆变换，以重构物体的磁化分布图像，其中NMR成像方法的特征在于，对于一​​个或多个核磁共振信号的NMR信号的测量重复多次， 特定相位编码量仅在许多相位编码量之中，将这样获得的多个NMR信号相加在一起并将其平均，并且通过加法和平均获得的数据进行二维傅里叶逆变换。

公开(公告)号：US4672318A

公开(公告)日：1987-06-09

申请号：US696909

申请日：1985-01-31

申请人： Kensuke Sekihara ,  Etsuji Yamamoto ,  Shigeru Matsui ,  Hideki Kohno

发明人： Kensuke Sekihara ,  Etsuji Yamamoto ,  Shigeru Matsui ,  Hideki Kohno

IPC分类号： G01R33/20 ,  A61B5/055 ,  A61B10/00 ,  G01R33/24 ,  G01R33/38 ,  G01R33/387

CPC分类号： G01R33/24

摘要： 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.

摘要翻译： 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。