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1. 发明授权

US4595879A Nuclear magnetic resonance flow imaging 失效
标题翻译：核磁共振流动成像
公开(公告)号：US4595879A
公开(公告)日：1986-06-17
申请号：US551244
申请日：1983-11-14
申请人： Arnold H. Lent , Waldo S. Hinshaw , Russell A. Compton
发明人： Arnold H. Lent , Waldo S. Hinshaw , Russell A. Compton
IPC分类号： G01F1/56 , G01R33/563 , G01R33/24
CPC分类号： G01F1/56 , G01R33/563
摘要： The effects of particle motion or flow within a sample may be measured by applying a motion-encoding gradient to the sample, along with spatial encoding gradients. The motion-encoding gradient applies two gradient fields of respective opposite sense to the spins of the sample so as to encode motion as a net phase component resulting from the two fields. Two image data sequences, one with motion encoding and one without, may be compared to measure the effects of motion, or a plurality of image data sequences may be taken, each with a different value motion-encoding gradient. A Fourier transformation performed on the sequence data in the latter case with respect to the variation in the motion-encoding gradient pulses will yield a plurality of images, each representing the amount of material which exhibits a different velocity.
摘要翻译：颗粒运动或样品内流动的影响可以通过对样品应用运动编码梯度以及空间编码梯度来测量。运动编码梯度对样本的自旋施加相应相反意义的两个梯度场，以便将运动编码为由两个场产生的净相位分量。可以比较具有运动编码和不具有运动编码的两个图像数据序列，以测量运动的效果，或者可以采用多个图像数据序列，每个图像数据序列具有不同的值运动编码梯度。对于后一种情况下针对运动编码梯度脉冲的变化执行的序列数据的傅立叶变换将产生多个图像，每个图像表示呈现不同速度的材料的量。

2. 发明授权

US4636728A Offset gradient fields in nuclear magnetic resonance imaging systems 失效
标题翻译：核磁共振成像系统中的偏移梯度场
公开(公告)号：US4636728A
公开(公告)日：1987-01-13
申请号：US621396
申请日：1984-06-18
申请人： Russell A. Compton , Waldo S. Hinshaw , David M. Kramer
发明人： Russell A. Compton , Waldo S. Hinshaw , David M. Kramer
IPC分类号： G01R33/38 , G01R33/385 , G01R33/20
CPC分类号： G01R33/385 , G01R33/381
摘要： The null point in the gradient field of an NMR imaging system is offset from its nominal position in the static magnetic field by application of a bias field to the gradient field. The bias field produces a substantially uniform offset in the field intensity at every point in the gradient field. Alternatively, null point offset may be achieved by controllably superimposing two gradient fields of separately located null points.
摘要翻译： NMR成像系统的梯度场中的零点通过向梯度场施加偏置场而偏离静态磁场中的标称位置。偏置场在梯度场中的每个点处的场强度中产生基本均匀的偏移。或者，可以通过可控地叠加分开定位的零点的两个梯度场来实现零点偏移。

3. 发明授权

US4695800A Non harmonic NMR spin echo imaging 失效
标题翻译：非谐波自旋回波成像
公开(公告)号：US4695800A
公开(公告)日：1987-09-22
申请号：US742161
申请日：1985-06-06
申请人： David M. Kramer , Russell A. Compton , Lawrence M. Strenk , James B. Murdoch
发明人： David M. Kramer , Russell A. Compton , Lawrence M. Strenk , James B. Murdoch
IPC分类号： G01R33/44 , A61B5/055 , A61B10/00 , G01R33/48 , G01R33/54 , G01R33/565 , H04N5/30 , G01R33/20
CPC分类号： G01R33/482 , G01R33/56554
摘要： A technique for producing multiple spin echo signals following an initial excitation pulse is provided. A first inverting pulse is applied a given time interval following the initial excitation pulse, resulting in the formation of the usual first spin echo signal after passage of the given time interval. At a later point in time, a second inverting pulse is applied. The time interval between the initial excitation pulse and this second inverting pulse is not required to be harmonically related to the first given time interval. This results in the production of at least a second, later occurring spin echo signal which does not contain harmonically-related artifact components of the earlier pulses and spin echo signals.
摘要翻译：提供了一种在初始激励脉冲之后产生多个自旋回波信号的技术。在初始激励脉冲之后的给定时间间隔施加第一反相脉冲，导致在给定时间间隔之后形成通常的第一自旋回波信号。在稍后的时间点，施加第二反相脉冲。初始激励脉冲与第二反相脉冲之间的时间间隔不需要与第一给定时间间隔谐波相关。这导致产生不包含较早脉冲和自旋回波信号的谐波相关伪像分量的至少第二个稍后发生的自旋回波信号。

4. 发明授权

US4665367A Multiplexed magnetic resonance imaging of volumetric regions 失效
标题翻译：体积区域的多重磁共振成像
公开(公告)号：US4665367A
公开(公告)日：1987-05-12
申请号：US766613
申请日：1985-08-16
申请人： David M. Kramer , Hong-Ning Yeung , Russell A. Compton
发明人： David M. Kramer , Hong-Ning Yeung , Russell A. Compton
IPC分类号： A61B10/00 , A61B5/055 , G01R33/48 , G01R33/54 , G01R33/20
CPC分类号： G01R33/4835 , G01R33/4828
摘要： In a magnetic resonance imaging system, a multiplexing technique is used to image volumetric regions by performing a number of scans within the recovery time of the spin systems. The multiple scans acquire signal information from sub-regional volumes by phase-encoding in the direction of the excitation gradient.
摘要翻译：在磁共振成像系统中，复用技术用于通过在旋转系统的恢复时间内执行多次扫描来对体积区域进行成像。多次扫描通过在激发梯度的方向上的相位编码从子区域体积获取信号信息。

5. 发明授权

US4616180A Nuclear magnetic resonance imaging with reduced sensitivity to motional effects 失效
标题翻译：核磁共振成像对运动效应的敏感性降低
公开(公告)号：US4616180A
公开(公告)日：1986-10-07
申请号：US551245
申请日：1983-11-14
申请人： Russell A. Compton
发明人： Russell A. Compton
IPC分类号： G01R33/561 , G01R33/563 , G01V3/00
CPC分类号： G01R33/561 , G01R33/563
摘要： The effects of motion in a given direction of particles being imaged in an NMR imaging system are substantially reduced by using gradients in the given direction produced by gradient pulse sequences which exhibit a zero value first moment relative to the point in time at which phase determination of the particles occurs. This point in time is generally taken at the time at which the longitudinal magnetization is translated to the transverse plane, as that is the phase reference for the NMR signals produced by the particles.
摘要翻译：在NMR成像系统中成像的颗粒的给定方向上的运动的影响通过使用由梯度脉冲序列产生的给定方向上的梯度来显着降低，该梯度脉冲序列相对于相位确定的时间点发生颗粒。这个时间点通常取决于纵向磁化平移到横向平面的时间，因为这是颗粒产生的NMR信号的相位参考。

6. 发明授权

US4673880A Phase sensitive detection in multislice magnetic resonance imaging systems 失效
标题翻译：多层磁共振成像系统中的相敏检测
公开(公告)号：US4673880A
公开(公告)日：1987-06-16
申请号：US766617
申请日：1985-08-16
申请人： Russell A. Compton , John T. Keller , Thomas R. McBride , David M. Kramer
发明人： Russell A. Compton , John T. Keller , Thomas R. McBride , David M. Kramer
IPC分类号： G01R33/36 , A61B5/055 , A61B10/00 , G01R33/32 , G01R33/44 , G01R33/48 , G01R33/58 , G01R33/20
CPC分类号： G01R33/583
摘要： In a magnetic resonance imaging system, the same reference signal is used for both radio frequency transmission and phase sensitive detection. The use of the same reference signal for both transmission and reception prevents phase unlock between the two events. However, this technique results in variation in the demodulated, frequency encoded information, which is corrected by digitally filtering the received signal information as a function of the demodulation frequency used.
摘要翻译：在磁共振成像系统中，相同的参考信号用于射频传输和相位敏感检测。对于发送和接收都使用相同的参考信号来防止两个事件之间的相位解锁。然而，该技术导致解调的频率编码信息的变化，其通过对接收到的信号信息进行数字滤波而被校正，这是所使用的解调频率的函数。

7. 发明授权

US4456881A Gradient-coil apparatus for a magnetic resonance system 失效
标题翻译：用于磁共振系统的梯度线圈装置
公开(公告)号：US4456881A
公开(公告)日：1984-06-26
申请号：US340546
申请日：1982-01-18
申请人： Russell A. Compton
发明人： Russell A. Compton
IPC分类号： A61B10/00 , A61B5/055 , G01R33/20 , G01R33/385 , H01F5/00 , H01F7/20 , G01R33/08
CPC分类号： H01F7/20 , G01R33/385
摘要： Apparatus for imposing a gradient magnetic field intensity on a static magnetic field intensity in a nuclear-magnetic-resonance (NMR) system. The gradient field has a predetermined error relationship with respect to a desired characteristic of the gradient field within a selected region. The selected region is substantially smaller in volume than the volume "enclosed" by a surface or surfaces on which electrical conductors are distributed to generate the gradient field. The surface current densities in a grid-like pattern of differential areas on the surfaces are chosen such that, within the selected region, the predetermined error relationship results. The gradient field intensity outside of the selected region generally does not have the characteristic desired within the region. The predetermined error relationship can be established in a linearly-varying field intensity in a spherical volume enclosed by a cylindrical surface. Generally hyperbolically-shaped electrical coils on the cylindrical surface can provide surface current densities required for a constant transverse-gradient (a linearly varying magnetic field intensity in a direction transverse to the axis of the cylinder).
摘要翻译：用于在核磁共振（NMR）系统中对静态磁场强度施加梯度磁场强度的装置。梯度场相对于选定区域内的梯度场的期望特性具有预定的误差关系。所选择的区域的体积比通过其上分布有电导体的表面或表面“封闭”的体积小得多，以产生梯度场。选择表面上的差分区域的格子状图案中的表面电流密度使得在所选择的区域内产生预定的误差关系。所选区域外的梯度场强通常不具有该区域内所需的特性。可以在由圆柱面包围的球形体积中的线性变化的场强中建立预定的误差关系。圆柱形表面上的通常双曲线形的电线圈可以提供恒定的横向梯度所需的表面电流密度（在垂直于圆柱体的轴线的方向上的线性变化的磁场强度）。

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