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。

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。

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.

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。

公开(公告)号：US5150052A

公开(公告)日：1992-09-22

申请号：US656993

申请日：1991-02-15

申请人： Mary E. Meyerand

发明人： Mary E. Meyerand

IPC分类号： G01R33/483

CPC分类号： G01R33/4831

摘要： A method and apparatus for nuclear magnetic resonance imaging of NMR chemical spectra is disclosed. A chemically nonhomogeneous sample is placed within a static uniform magnetic field. A spatially uniform radio frequency excitation field B.sub.1 is imposed on the sample at a nonzero angle relative to the static magnetic field. A spatially nonuniform radio frequency detection field is superimposed on the static magnetic fields in the same region as the excitation field. The spatially nonuniform radio frequency detection field has a cusp shape surrounding a point of negligible radio frequency detection sensitivity. The point of negligible radio frequency detection sensitivity is sequentially positioned at each of a plurality of different positions within the sample. Signals corresponding to radio frequency energy absorption or radiation by the sample volume at each position are detected. A spatial distribution of the chemical compounds within the sample is calculated based on the NMR spectra detected.

摘要翻译： 公开了一种用于核磁共振成像NMR方法和装置。 将化学非均质样品置于静态均匀磁场内。 空间均匀的射频激励场B1相对于静磁场以非零的角度施加在样本上。 空间不均匀的射频检测场叠加在与激励场相同的区域上的静态磁场上。 空间不均匀射频检测场具有围绕射频检测灵敏度可忽略的点的尖点形状。 可忽略的射频检测灵敏度的点依次位于样本内的多个不同位置的每个位置。 检测对应于每个位置处的样品体积的射频能量吸收或辐射的信号。 基于所检测的NMR光谱计算样品中化合物的空间分布。

公开(公告)号：US4718431A

公开(公告)日：1988-01-12

申请号：US914235

申请日：1986-10-02

申请人： Winfried Hartl ,  Arnulf Oppelt ,  Helmut Sturm

发明人： Winfried Hartl ,  Arnulf Oppelt ,  Helmut Sturm

IPC分类号： A61B10/00 ,  A61B5/055 ,  A61M25/095 ,  G01R33/28 ,  G01R33/34 ,  G01R33/341 ,  G01R33/465 ,  G01R33/483 ,  G01R33/58 ,  H01F7/20 ,  A61B5/05

CPC分类号： G01R33/341 ,  G01R33/465 ,  G01R33/4831 ,  G01R33/58

摘要： A coil for conducting examination of a patient in a nuclear magnetic resonance apparatus has a flat surface coil for spectroscopic in vivo examination of the patient and a calibration substance disposed within the coil. The coil is placed in the patient during examination, and the calibration subject supplies a nuclear magnetic resonance signal measurable by the coil as a reference.

摘要翻译： 用于在核磁共振装置中进行患者检查的线圈具有用于患者的体内体内检查的平面线圈和设置在线圈内的校准物质。 线圈在检查期间放置在患者身上，校准对象提供由线圈测量的核磁共振信号作为参考。

公开(公告)号：US4682107A

公开(公告)日：1987-07-21

申请号：US715244

申请日：1985-03-25

申请人： Max R. Bendall ,  David T. Pegg

发明人： Max R. Bendall ,  David T. Pegg

IPC分类号： G01R33/20 ,  G01N24/08 ,  G01R33/341 ,  G01R33/44 ,  G01R33/465 ,  G01R33/483

CPC分类号： G01R33/341 ,  G01R33/465 ,  G01R33/4831

摘要： In a method of operating a nuclear magnetic resonance (NMR) spectrometer in relation to a sample comprising two types of nuclei, a sequence of radiofrequency pulses and delay periods is applied using two different radiofrequency coils, one for each type of nucleus, each coil providing an inhomogeneous radiofrequency field, so that the two coils generate separate but overlapping sensitive volumes for each of the two types of nuclear species, whereby signal intensity is substantially limited to the overlap volume.

摘要翻译： 相对于包含两种类型的核的样品来操作核磁共振（NMR）光谱仪的方法，使用两种不同的射频线圈施加射频脉冲和延迟周期序列，每种类型的核一个，每个线圈提供 两个线圈对于两种类型的核物种中的每一种产生分开但重叠的灵敏体积，由此信号强度基本上限于重叠体积。

公开(公告)号：US4590947A

公开(公告)日：1986-05-27

申请号：US665355

申请日：1984-10-26

申请人： Norbert Krause

发明人： Norbert Krause

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/34 ,  G01R33/341 ,  G01R33/483 ,  A61B5/05

CPC分类号： G01R33/341 ,  G01R33/4831

摘要： An apparatus for generating a magnetic high-frequency field and/or for receiving corresponding high-frequency signals in nuclear spin resonance apparatus, particularly in medical technology, comprises a coil winding which can be arranged within an at least partially homogeneous magnetic field region of a magnetic field which is generated by a base field magnet and is oriented along an axis, at least in the vicinity of a body or body parts to be examined. This apparatus improves the ability to localize the atomic nuclei emitting the resonance signals. For this purpose, a high-frequency coil winding of substantially rectangular shape is provided, wherein at least two parallel longitudinal conductor sections of the winding are made substantially longer than the transverse conductor sections which connect them to each other and extend transversely. The longitudinal conductor sections are arranged at least largely perpendicularly to the orientation direction of the magnetic field of the base field magnet, and the transverse conductor sections are preferably spaced at a greater distance from the body to be examined than the longitudinal conductor sections.

摘要翻译： 一种用于在核自旋谐振装置中产生磁高频场和/或用于接收对应的高频信号的装置，特别是医疗技术中的一种装置，包括线圈绕组，该线圈绕组可布置在一个至少部分均匀的磁场区域 至少在被检查物体或身体部位的附近，由场磁体产生的并且沿轴线取向的磁场。 该装置提高了定位发射谐振信号的原子核的能力。 为此，提供了一种基本为矩形的高频线圈绕组，其中绕组的至少两个平行的纵向导体部分比使它们彼此连接并横向延伸的横向导体部分大得长。 纵向导体部分至少大致垂直于基极磁体的磁场的取向方向布置，并且横向导体部分优选地与被检体相比比纵向导体部分间隔开更大的距离。