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公开(公告)号：US07002348B2
公开(公告)日：2006-02-21
申请号：US10939419
申请日：2004-09-14
申请人： Wingchi Edmund Kwok , Zhigang You , Jianhui Zhong
发明人： Wingchi Edmund Kwok , Zhigang You , Jianhui Zhong
IPC分类号： G01V3/00
CPC分类号： G01R33/3657 , G01R33/34023 , G01R33/3415
摘要： An RF coil construction for MRI is disclosed. The construction includes a device for cryogenically cooling receiver coils, at least two coil elements being cryogenically cooled by the device and forming an array. Each coil element includes at least two capacitors for tuning and matching the coil element. The construction also includes a circuit connected to each coil element for decoupling the coil element from the transmitter coil(s), and also for decoupling among coil elements.
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2.发明授权Optimized orthogonal gradient technique for fast quantitative diffusion MRI on a clinical scanner 有权用于临床扫描仪快速定量扩散MRI的优化正交梯度技术公开(公告)号：US06288540B1
公开(公告)日：2001-09-11
申请号：US09573940
申请日：2000-05-19
申请人： Zhong Chen , Jianhui Zhong , Wingchi Edmund Kwok
发明人： Zhong Chen , Jianhui Zhong , Wingchi Edmund Kwok
IPC分类号： G01V300
CPC分类号： G01R33/56341
摘要： A technique for MRI or the like employs optimized orthogonal gradients. For a device having a peak physical magnetic field gradient strength G0, the gradients are optimized if, in physical space, one gradient has a value −0.5G0 while the two gradients orthogonal thereto have the value G0. That is equivalent to an optimized orthogonal gradient space in which one gradient has a value 1.5G0 while the two gradients orthogonal thereto have the value zero. The gradients are cycled over a sequence of six gradient pulses to provide enough data to calculate the diffusion tensor.
摘要翻译： 用于MRI等的技术使用优化的正交梯度。 对于具有峰值物理磁场梯度强度G0的器件，如果在物理空间中，一个梯度具有值-0.5G0，而与其正交的两个梯度具有值G0，则梯度被优化。 这相当于一个优化的正交梯度空间，其中一个梯度具有值为1.5G0，而与其正交的两个梯度的值为零。 梯度在六个梯度脉冲的序列上循环，以提供足够的数据来计算扩散张量。
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3.发明授权Cryogenically cooled phased array RF receiver coil for magnetic resonance imaging 失效用于磁共振成像的低温相控阵射频接收器线圈公开(公告)号：US06825664B2
公开(公告)日：2004-11-30
申请号：US10405633
申请日：2003-04-03
申请人： Wingchi Edmund Kwok , Zhigang You , Jianhui Zhong
发明人： Wingchi Edmund Kwok , Zhigang You , Jianhui Zhong
IPC分类号： G01V300
CPC分类号： G01R33/3657 , G01R33/34023 , G01R33/3415
摘要： An RF coil construction for MRI is disclosed. The construction includes a device for cryogenically cooling receiver coils, at least two coil elements being cryogenically cooled by the device and forming an array. Each coil element includes at least two capacitors for tuning and matching the coil element. The construction also includes a circuit connected to each coil element for decoupling the coil element from the transmitter coil(s), and also for decoupling among coil elements.
摘要翻译： 公开了用于MRI的RF线圈结构。 该结构包括用于低温冷却接收器线圈的装置，至少两个线圈元件被器件低温冷却并形成阵列。 每个线圈元件包括用于调谐和匹配线圈元件的至少两个电容器。 该结构还包括连接到每个线圈元件的电路，用于将线圈元件与发射器线圈分离，并且还用于线圈元件之间的去耦。
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4.发明授权Interleaved water and fat dual-echo spin echo magnetic resonance imaging with intrinsic chemical shift elimination 失效具有固有化学位移消除的交错水和脂肪双回波自旋回波磁共振成像公开(公告)号：US06583623B1
公开(公告)日：2003-06-24
申请号：US09821087
申请日：2001-03-30
IPC分类号： G01V300
CPC分类号： G01R33/4828
摘要： In magnetic resonance imaging, a pulse sequence is used to obtain both water-only and fat-only signals within a single acquisition time. Pulses and readout gradients are applied to take a proton-density-weighted image of the water, a proton-density-weighted image of the fat, and a T2-weighted image of the water. Between the first water readout gradient and the fat readout gradient, a spoiling gradient is applied to spoil the first water echo. Between the fat readout gradient and the second water readout gradient, a refocusing gradient is applied to refocus the second water echo. The proton-density-weighted images of water and fat are combined to form water-plus-fat images free of in-plane and through-plane chemical-shift artifacts.
摘要翻译： 在磁共振成像中，脉冲序列用于在单个采集时间内获得纯水和仅脂肪信号。 应用脉冲和读出梯度来获取水的质子密度加权图像，脂肪的质子密度加权图像和水的T2加权图像。 在第一个水读数梯度和脂肪读数梯度之间，应用破坏梯度来破坏第一个水回波。 在脂肪读数梯度和第二水读数梯度之间，应用重聚焦梯度来重新聚焦第二水回波。 水和脂肪的质子密度加权图像被组合以形成没有平面内和平面上的化学位移假象的水加脂肪图像。
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5.发明申请Cryogenically cooled phased array RF receiver coil for magnetic resonance imaging 失效用于磁共振成像的低温相控阵射频接收器线圈公开(公告)号：US20050030032A1
公开(公告)日：2005-02-10
申请号：US10939419
申请日：2004-09-14
申请人： Wingchi Kwok , Zhigang You , Jianhui Zhong
发明人： Wingchi Kwok , Zhigang You , Jianhui Zhong
IPC分类号： G01R33/3415 , G01R33/36 , G01V3/00
CPC分类号： G01R33/3657 , G01R33/34023 , G01R33/3415
摘要： An RF coil construction for MRI is disclosed. The construction includes a device for cryogenically cooling receiver coils, at least two coil elements being cryogenically cooled by the device and forming an array. Each coil element includes at least two capacitors for tuning and matching the coil element. The construction also includes a circuit connected to each coil element for decoupling the coil element from the transmitter coil(s), and also for decoupling among coil elements.
摘要翻译： 公开了用于MRI的RF线圈结构。 该结构包括用于低温冷却接收器线圈的装置，至少两个线圈元件被器件低温冷却并形成阵列。 每个线圈元件包括用于调谐和匹配线圈元件的至少两个电容器。 该结构还包括连接到每个线圈元件的电路，用于将线圈元件与发射器线圈分离，并且还用于线圈元件之间的去耦。
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6.发明授权System and method for three-dimensional interleaved water and fat image acquisition with chemical-shift correction 失效用化学位移校正进行三维交错水和脂肪图像采集的系统和方法公开(公告)号：US06373249B1
公开(公告)日：2002-04-16
申请号：US09573845
申请日：2000-05-19
IPC分类号： G01V300
CPC分类号： G01R33/4828 , G01R33/4822
摘要： A magnetic imaging device, such as an MR scanner, is used to provide a modified three-dimensional gradient echo sequence having a spatial-spectral excitation in which phase-encoding lines are interleaved for the excitation of water and of fat. The phase-encoding lines are spaced by an interval equal to half of the repetition time. The resulting data are sorted for the reconstruction of water-only and fat-only images, which are realigned and combined to form water-fat combined images free of chemical shift artifacts.
摘要翻译： 使用诸如MR扫描仪的磁性成像装置来提供具有空间光谱激励的经修改的三维梯度回波序列，其中相位编码线被交织以激发水和脂肪。 相位编码线间隔等于重复时间的一半的间隔。 所得数据被排序用于仅重现和仅脂肪图像的重建，其被重新对齐并组合以形成没有化学位移伪影的水脂组合图像。
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公开(公告)号：US06528997B2
公开(公告)日：2003-03-04
申请号：US09811831
申请日：2001-03-20
申请人： Jianhui Zhong , Zhong Chen , Wingchi E. Kwok
发明人： Jianhui Zhong , Zhong Chen , Wingchi E. Kwok
IPC分类号： G01V300
CPC分类号： G01R33/4833 , G01R33/56
摘要： In nuclear magnetic resonance imaging of the human brain or the like, multiple quantum coherences, such as intermolecular double quantum coherence (iDQC) between water molecules, are used for soft tissue contrast. A group of pulse sequences are used in which, (a) The standard &bgr;=&pgr;/2 pulse in the original CRAZED sequence is replaced with a &pgr;/3 pulse. The maximum signal derived from iDQCs is increased by a factor of 3{square root over (3)}/4. (b) The position of the acquisition window is adjusted, and a large acquisition window (small bandwidth) is used to sample a broad range of time-domain signals. (c) Receiver dynamic range is optimized. (d) A two-step phase cycle scheme for iDQC-encode gradients is designed to remove additional undesired coherence pathways.
摘要翻译： 在人脑等的核磁共振成像中，使用多个量子相干性，例如水分子之间的分子间双量子相干（iDQC），用于软组织对比度。 使用一组脉冲序列，其中（a）原始CRAZED序列中的标准β= pi / 2脉冲被替换为pi / 3脉冲。 从iDQC导出的最大信号增加了3 {平方根超过（3/4）（b）调整采集窗口的位置，并使用大的采集窗口（小带宽）来采样宽范围 的时域信号（c）优化接收机动态范围（d）iDQC编码梯度的两步相循环方案被设计为消除额外的不期望的相干路径。
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