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121. 发明授权

US08159222B2 Method for radio-frequency nuclear magnetic resonance imaging 有权
标题翻译：射频核磁共振成像方法
公开(公告)号：US08159222B2
公开(公告)日：2012-04-17
申请号：US12449822
申请日：2008-05-02
申请人： Scott King , Jonathan Sharp
发明人： Scott King , Jonathan Sharp
IPC分类号： G01V3/14 , A61B5/05
CPC分类号： G01R33/3415 , G01R33/34061 , G01R33/482 , G01R33/4831 , G01R33/5612 , G01R33/5617
摘要： Accumulated spin magnetization phase within a RF MRI procedure can be used for providing an orderly k-space traversal. By operating a transmit array adapted to produce two B1 fields in alternation, where the B1 fields are substantially uniform in amplitude over a sample volume of the MRI setup, and the B1 fields have respective spatial phase distributions such that selection of a difference in spatial derivatives of the spatial phase distributions permits control over a size of a step in k-space applied by successive refocusing pulses for generating the B1 fields in alternation. Each alternating refocusing pulse issued within a T2 time causes a step through k-space in an encoding direction determined by the difference in spatial derivatives.
摘要翻译： RF MRI程序内的累积自旋磁化相可用于提供有序的k空间遍历。通过操作适于产生交替的两个B1场的发射阵列，其中B1场在MRI设置的采样体积上幅度基本上均匀，并且B1场具有相应的空间相位分布，使得选择空间导数的差异的空间相位分布允许通过连续重聚焦脉冲施加的k空间中的步长的尺寸的控制，以便交替地生成B1场。在T2时间内发出的每个交替重聚焦脉冲在由空间导数的差异确定的编码方向上产生通过k空间的步长。

122. 发明授权

US07852074B2 Apparatus and method for measuring cased hole fluid flow with NMR 有权
标题翻译：用NMR测量套管孔流体的装置和方法
公开(公告)号：US07852074B2
公开(公告)日：2010-12-14
申请号：US12099612
申请日：2008-04-08
申请人： Carl Edwards
发明人： Carl Edwards
IPC分类号： G01V3/00
CPC分类号： G01V3/32 , G01N24/081 , G01R33/4831 , G01R33/5617 , G01R33/56308
摘要： A method and apparatus useful to determine characteristics of fluid flow, such as fluid holdup and flow velocity. The apparatus comprises a flow tube, a permanent magnet, a first set of coils, and a second set of coils. The first set of coils creates a radio frequency magnetic field within the flow tube with a series of refocusing pulses. The second set of coils encodes velocity information onto the fluid molecules using rotating frame zeugmatography that is later decoded and used to estimate the fluid flow velocity.
摘要翻译：用于确定流体流动特性的方法和装置，例如流体滞留和流速。该装置包括流管，永磁体，第一组线圈和第二组线圈。第一组线圈在流管内产生一系列重聚焦脉冲的射频磁场。第二组线圈使用稍后解码并用于估计流体流速的旋转框架色谱法将速度信息编码到流体分子上。

123. 发明申请

US20100171499A1 RF BASED SPATIALLY SELECTIVE EXCITATION IN MRI 有权
标题翻译：基于RF的空间选择性激活MRI
公开(公告)号：US20100171499A1
公开(公告)日：2010-07-08
申请号：US12449835
申请日：2008-05-02
申请人： Jonathan Sharp , Scott King
发明人： Jonathan Sharp , Scott King
IPC分类号： G01R33/44
CPC分类号： G01R33/4831 , G01R33/34076 , G01R33/3415 , G01R33/3607 , G01R33/4833
摘要： Herein a method for slice selection is provided in an MRI process, the method involves controlling a transmit array by adding low flip angle RF pulses interspersed between refocusing pulses that are used to move a k-space weighting function with respect to one or more B 1 fields used to deposit energy according to a desired k-space weighting function. The low flip angle pulses deposit energy so that an envelope traced by the low flip angle pulses in the k-space weighting function is related to a desired spatially excited region of the sample volume, for example by a Fourier transform, if the phase encoding directions are linear axes that coordinatize the sample volume, and the B 1 fields have linear phase gradients.
摘要翻译：这里，在MRI处理中提供了切片选择的方法，该方法包括通过将用于相对于一个或多个B 1移动k空间加权函数的再聚焦脉冲之间散布的低翻转RF脉冲相加来控制发射阵列用于根据期望的k空间加权函数来存储能量的场。低翻转角脉冲沉积能量，使得通过k空间加权函数中的低翻转角脉冲跟踪的包络与样本体积的期望的空间激发区域有关，例如通过傅里叶变换，如果相位编码方向是使样本体积协调的线性轴，B 1场具有线性相位梯度。

124. 发明授权

US07466128B2 Multicoil NMR data acquisition and processing methods 有权
标题翻译：多核磁共振数据采集和处理方法
公开(公告)号：US07466128B2
公开(公告)日：2008-12-16
申请号：US11329313
申请日：2006-01-09
申请人： David O. Walsh
发明人： David O. Walsh
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/44 , G01R33/445 , G01R33/4831 , G01V3/14
摘要： A multicoil NMR data acquisition apparatus and processing method for performing three-dimensional magnetic resonance imaging in a static magnetic field without the application of controlled static magnetic field gradients. A preferred application relates specifically to the detection and localization of groundwater using the Earth's magnetic field. Multicoil arrays are used in both transmit and receive modes, and coherent data processing algorithms applied to the data to generate three-dimensional NMR spin density estimates. Disclosed are methods for acquiring NMR data using an array of at least two transmit and receive coils, and for processing such multicoil data to estimate the three-dimensional NMR spin density distributions.
摘要翻译：一种用于在不施加受控静态磁场梯度的情况下在静态磁场中进行三维磁共振成像的多芯NMR数据采集装置和处理方法。优选的应用具体涉及使用地球磁场的地下水的检测和定位。 Multicoil阵列用于发射和接收模式，并且将相干数据处理算法应用于数据以产生三维NMR自旋密度估计。公开了使用至少两个发射和接收线圈的阵列获取NMR数据的方法，并且用于处理这样的多芯片数据以估计三维NMR自旋密度分布。

125. 发明授权

US07411398B2 MRI apparatus using periodic gradients which change in periodicity within each repetition, in one spatial direction 有权
标题翻译： MRI装置使用周期性梯度，其在一个空间方向上在每次重复期间周期性改变
公开(公告)号：US07411398B2
公开(公告)日：2008-08-12
申请号：US11436373
申请日：2006-05-17
申请人： Rainer Kuth , Arnulf Oppelt
发明人： Rainer Kuth , Arnulf Oppelt
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/385 , G01R33/4831 , G01R33/56383 , G01R33/56572
摘要： A magnetic resonance apparatus has a transmission and reception coil system and a gradient coil system that is designed to generate a gradient field that is periodic in one spatial direction. The gradient field and/or the examination subject can be displaced in the spatial direction of the periodicity to generate a relative position change between the periodic gradient field and an examination subject, and the transmission and reception coil system comprises individually-activatable coil arrays to allow data to be acquired to fill in gaps or resolve ambiguous data entries that occur due to the gradient field being periodic.
摘要翻译：磁共振装置具有收发线圈系统和梯形线圈系统，其被设计成产生在一个空间方向上周期性的梯度场。梯度场和/或检查对象可以在周期的空间方向上移位以产生周期性梯度场和检查对象之间的相对位置变化，并且发射和接收线圈系统包括可单独激活的线圈阵列以允许要获取的数据以填补间隙或解决由于梯度字段是周期性而发生的模糊数据条目。

126. 发明申请

US20060273796A1 Magnetic resonance imaging apparatus 有权
标题翻译：磁共振成像装置
公开(公告)号：US20060273796A1
公开(公告)日：2006-12-07
申请号：US11436373
申请日：2006-05-17
申请人： Rainer Kuth , Arnulf Oppelt
发明人： Rainer Kuth , Arnulf Oppelt
IPC分类号： G01V3/00
CPC分类号： G01R33/3415 , G01R33/385 , G01R33/4831 , G01R33/56383 , G01R33/56572
摘要： A magnetic resonance apparatus has a transmission and reception coil system and a gradient coil system that is designed to generate a gradient field that is periodic in one spatial direction. The gradient field and/or the examination subject can be displaced in the spatial direction of the periodicity to generate a relative position change between the periodic gradient field and an examination subject, and the transmission and reception coil system comprises individually-activatable coil arrays to allow data to be acquired to fill in gaps or resolve ambiguous data entries that occur due to the gradient field being periodic.
摘要翻译：磁共振装置具有收发线圈系统和梯形线圈系统，其被设计成产生在一个空间方向上周期性的梯度场。梯度场和/或检查对象可以在周期的空间方向上移位以产生周期性梯度场和检查对象之间的相对位置变化，并且发射和接收线圈系统包括可单独激活的线圈阵列以允许要获取的数据以填补间隙或解决由于梯度字段是周期性而发生的模糊数据条目。

127. 发明申请

US20050242815A1 Magnetic gradient field projection 失效
标题翻译：磁梯度场投影
公开(公告)号：US20050242815A1
公开(公告)日：2005-11-03
申请号：US11175125
申请日：2005-07-06
申请人： Peter Morris , Abdullah Jamea
发明人： Peter Morris , Abdullah Jamea
IPC分类号： G01R33/20 , A61B5/055 , G01R33/38 , G01R33/385 , G01R33/44 , G01R33/483 , G01V3/00
CPC分类号： G01R33/3808 , G01N24/084 , G01R33/385 , G01R33/441 , G01R33/4831
摘要： The invention relates to the projection of magnetic gradient fields for use in Magnetic Resonance Imaging. The projection of a gradient outside of a field generating assembly allows imaging of samples which will not physically fit inside the coil confines. An apparatus and method for improving the linearity of the projected gradient field is disclosed. This is achieved by arranging the position of the magnetic field generating coil conductors such that the second derivative of a gradient component is equal to zero. In one practical example the linearity is improved by providing a first circular coil which is positioned so that its centre is offset along the axis of the field generating coil assembly by a distance equal to half the radius of the coil. In another example a pair of current carrying wires are selectively positioned offset from a region of interest.
摘要翻译：本发明涉及用于磁共振成像的磁梯度场的投影。场产生组件外部的梯度的投影允许对物理上不适合线圈限制的样本的成像。公开了一种用于提高投影梯度场的线性度的装置和方法。这是通过布置磁场产生线圈导体的位置使得梯度分量的二阶导数等于零来实现的。在一个实际的例子中，通过提供第一圆形线圈来提高线性度，该第一圆形线圈被定位成使得其中心沿着场产生线圈组件的轴线偏移距离等于线圈半径的距离。在另一示例中，一对载流导线选择性地定位为偏离感兴趣区域。

128. 发明申请

US20040130324A1 Azimuthal NMR imaging of formation properties from a wellbore 失效
标题翻译：来自井筒的地层特征的方位核磁共振成像
公开(公告)号：US20040130324A1
公开(公告)日：2004-07-08
申请号：US10717123
申请日：2003-11-19
申请人： Baker Hughes Incorporated
发明人： Carl M. Edwards
IPC分类号： G01V003/00
CPC分类号： G01V3/32 , G01N24/081 , G01R33/4831
摘要： A method and apparatus for performing NMR measurements suppressing contribution to NMR signals from within the borehole. Within the region of examination, the RF magnetic field has a spatially varying intensity. NMR signals (free induction decay or spin echo signals) are inverted to give spin density as a function of field intensity. This inversion is then mapped to spatial positions using the known RF field variation. The effect of signals arising from within the borehole can be suppressed. It is also possible to obtain an azimuthal image of the spin density.
摘要翻译：用于进行NMR测量的方法和装置，其抑制来自钻孔内的NMR信号的贡献。在检查范围内，RF磁场具有空间变化的强度。 NMR信号（自由感应衰减或自旋回波信号）被反转，以提供作为场强的函数的自旋密度。然后使用已知的RF场变化将该反演映射到空间位置。可以抑制由井内产生的信号的影响。也可以获得自旋密度的方位角图像。

129. 发明授权

US06538444B2 Two dimensional B1-gradient NMR imager 失效
公开(公告)号：US06538444B2
公开(公告)日：2003-03-25
申请号：US10156174
申请日：2002-05-28
申请人： Rex E. Gerald, II , Rafael L. Greenblatt , Jerome W. Rathke
发明人： Rex E. Gerald, II , Rafael L. Greenblatt , Jerome W. Rathke
IPC分类号： G01V300
CPC分类号： G01R33/307 , G01R33/4831
摘要： A two dimensional B1-gradient NMR imager and methods for non-invasive spectroscopic investigations and imaging of the internal distribution and speciation of materials of fluid, solid, and semisolid objects in two spatial dimensions utilizing a toroid cavity detector. An RF signal transmitter/receiver generates a magnetic field B1 within the toroid cavity and receives a sample response to the magnetic fields B0 and B1. A pivot angle position controller adjusts a pivot angle position of the toroid cavity and enclosed sample to vary an angle between the magnetic field B0 and the central axis of said toroid cavity. A positional rotation controller positions the toroid cavity and enclosed sample at variable angular orientations relative to an initial position and a plane formed by the externally applied static main magnetic field B0 and the central axis of the toroid cavity. A computer sequentially receives and processes sample responses to produce a two-dimensional image.

130. 发明授权

US5521504A Pulse sequence and method for creating a radio-frequency magnetic field gradient with a spatially independent phase for NMR experiments 失效
标题翻译：用于创建具有空间独立相的NMR实验的射频磁场梯度的脉冲序列和方法
公开(公告)号：US5521504A
公开(公告)日：1996-05-28
申请号：US177761
申请日：1994-01-04
申请人： David G. Cory , Frank H. Laukien , Werner E. Maas
发明人： David G. Cory , Frank H. Laukien , Werner E. Maas
IPC分类号： G01R33/46 , G01R33/48 , G01R33/483 , G01V3/00
CPC分类号： G01R33/446 , G01R33/46 , G01R33/4831
摘要： A composite RF pulse is created from a sequence of conventional homogeneous RF pulses and conventional gradient RF pulses and the composite pulse generates a gradient magnetic field with a spatially varying amplitude, but a spatially independent phase. In one embodiment of the invention, the pulse sequence consists of four conventional gradient RF pulses interspersed with two conventional homogeneous RF pulses. In another embodiment of the invention, a conventional gradient RF pulse is combined with a conventional homogeneous RF pulse and the pulse pair is repeated in order to generate an effective magnetic field with a spatially varying amplitude, but a spatially independent phase.
摘要翻译：复合RF脉冲是从传统的均匀RF脉冲序列和常规梯度RF脉冲序列产生的，并且复合脉冲产生具有空间变化幅度但空间上独立相位的梯度磁场。在本发明的一个实施例中，脉冲序列由散布有两个常规均匀RF脉冲的四个常规梯度RF脉冲组成。在本发明的另一个实施例中，传统的梯度RF脉冲与传统的均匀RF脉冲组合，并且重复脉冲对以便产生具有空间变化幅度但空间上独立相位的有效磁场。

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