公开(公告)号：US5502386A

公开(公告)日：1996-03-26

申请号：US340100

申请日：1994-11-15

申请人： John Bourg ,  James Mitchell ,  Mark Mirotznik ,  Bradley Roth ,  Sankaran Subramanian ,  Murali Cherukuri ,  Paul G. Zablocky ,  Thomas J. Pohida ,  Paul D. Smith ,  Walter S. Friauf ,  Rolf G. Tschudin

发明人： John Bourg ,  James Mitchell ,  Mark Mirotznik ,  Bradley Roth ,  Sankaran Subramanian ,  Murali Cherukuri ,  Paul G. Zablocky ,  Thomas J. Pohida ,  Paul D. Smith ,  Walter S. Friauf ,  Rolf G. Tschudin

IPC分类号： G01R33/20 ,  A61B5/055 ,  G01N24/10 ,  G01R33/60

CPC分类号： G01R33/60

摘要： An EPR imager and spectrometer includes pulse generating system for generating broadband pulses having an RF carrier frequency that is not highly absorbed by biological samples. The pulse generating system includes up and down chirp convertors for frequency modulating a carrier frequency pulse and compressing the frequency modulated pulse to form a broadband excitation pulse of high energy. Such a machine could form the basis of a clinical imaging device capable of high sensitivity to free radical species in human patients.

公开(公告)号：US5486762A

公开(公告)日：1996-01-23

申请号：US291960

申请日：1994-08-15

申请人： Robert Freedman ,  Christopher E. Morriss

发明人： Robert Freedman ,  Christopher E. Morriss

IPC分类号： G01R33/44 ,  G01V3/32 ,  G01R33/20

CPC分类号： G01N24/081 ,  G01V3/32

摘要： When a pulsed nuclear magnetic resonance (NMR) well logging tool is traversing a wellbore, a NMR well logging method includes magnetizing the hydrogen nuclei in a formation traversed by the tool with a static magnetic field, waiting for a first period of time W.sub.1, energizing the formation with oscillating RF pulses, collecting a first plurality of spin echo signals, waiting a second period of time W.sub.2 which is different from the first period of time W.sub.1, energizing the formation with oscillating RF pulses, collecting a second plurality of spin echo signals, waiting a third period of time W.sub.3 which is different from both the second period of time W.sub.2 and the first period of time W.sub.1, energizing the formation with oscillating RF pulses, collecting a third plurality of spin echo signals, etc. The first, second and third, etc. plurality of spin echo signals corresponding to the different wait times are input to a signal processing apparatus disposed in the tool. Window sums of spin-echo signals are computed and transmitted uphole to a surface oriented signal processing apparatus. In response to the window sums, the surface signal processing apparatus determines an apparent formation T.sub.2 -distribution for each wait time in the multi-wait time pulse sequence. The apparent T.sub.2 -distributions are used to construct a cost function. When the cost function is minimized, the surface oriented signal processing apparatus determines estimates of the true T.sub.1 /T.sub.2 ratios and intrinsic T.sub.2 -distributions of the formations being logged. The surface signal processing apparatus uses the new T.sub.2 -distribution to generate new, more accurate, output record medium.

摘要翻译： 当脉冲核磁共振（NMR）测井仪器穿过井筒时，NMR测井方法包括在静电磁场中磁化由工具穿过的地层中的氢核，等待第一时间段W1，激励 采用振荡RF脉冲的形成，收集第一多个自旋回波信号，等待与第一时间段W1不同的第二时间段W2，以振荡RF脉冲激励地层，收集第二多个自旋回波信号 等待与第二时间段W2和第一时间段W1不同的第三时间段W3，用振荡RF脉冲激励地层，收集第三个多个自旋回波信号等。第一，第二时间 和第三等等，对应于不同等待时间的多个自旋回波信号被输入到设置在该工具中的信号处理装置。 自旋回波信号的窗口总和被计算并在井上传输到面向表面的信号处理装置。 响应于窗口和，表面信号处理装置在多等待时间脉冲序列中确定每个等待时间的表观形成T2分布。 明显的T2分布用于构建成本函数。 当成本函数最小化时，表面取向信号处理装置确定正在记录的地层的真实T1 / T2比值和固有T2分布的估计。 表面信号处理装置使用新的T2分布来生成新的更准确的输出记录介质。

公开(公告)号：US5469059A

公开(公告)日：1995-11-21

申请号：US175448

申请日：1993-12-30

申请人： Charles L. Dumoulin

发明人： Charles L. Dumoulin

IPC分类号： G01F1/716 ,  G01P5/00 ,  G01P15/08 ,  G01R33/563 ,  G01R33/20

CPC分类号： G01P5/001 ,  G01F1/716 ,  G01P15/08 ,  G01R33/563

摘要： A motion imaging method uses magnetic resonance to detect acceleration, and an velocity distribution within moving materials in a subject. Acceleration encoding is performed by computing differences of data obtained with modulated motion-encoding magnetic field gradient pulses. Distributions of velocity are measured responsive to a motion sensitive phase-encoding gradient pulse.

摘要翻译： 运动成像方法使用磁共振来检测被摄体内的移动材料内的加速度和速度分布。 通过计算通过调制的运动编码磁场梯度脉冲获得的数据的差异来执行加速编码。 响应于运动敏感相位编码梯度脉冲测量速度分布。

公开(公告)号：US5432446A

公开(公告)日：1995-07-11

申请号：US219860

申请日：1994-03-29

申请人： Jason P. MacInnis ,  Don T. Macune ,  Christopher E. Morriss ,  Richard W. Oldigs ,  John E. Smaardyk ,  Joseph M. Steiner, Jr.

发明人： Jason P. MacInnis ,  Don T. Macune ,  Christopher E. Morriss ,  Richard W. Oldigs ,  John E. Smaardyk ,  Joseph M. Steiner, Jr.

IPC分类号： G01R33/38 ,  G01R33/44 ,  G01V3/32 ,  G01R33/20

CPC分类号： G01R33/3808 ,  G01V3/32

摘要： NMR logging apparatus is provided which produces a strong, static and homogeneous magnetic field B.sub.0 in a Volume of an adjacent formation on one side of the tool to measure nuclear magnetic resonance characteristics thereof at two different depths of investigations. In the preferred embodiment, the tool has an RF antenna mounted on the outside of the metal body of the tool, directing focused oscillating magnetic fields B.sub.1 at said Volume to polarize or tip the magnetic moments of hydrogen nuclei of fluids within rock pores. The same antenna can be used to receive signals of proton precession in the Volume of interest immediately after transmission of the RF polarizing field B.sub.1. One of the NMR readings is employed to compensate for inaccuracies in the other NMR reading to provide an overall improved NMR log.

摘要翻译： 提供NMR测井装置，其在工具的一侧上的邻近地层的体积中产生强的，静态的和均匀的磁场B0，以在两个不同的调查深度测量其核磁共振特征。 在优选实施例中，该工具具有安装在工具的金属体的外侧上的RF天线，将聚焦的振荡磁场B1引导到所述体积以使岩石孔内的流体的氢核的磁矩偏振或尖端。 相同的天线可以在RF极化场B1的发射之后立即接收感兴趣的体积中的质子进动信号。 使用一个NMR读数来补偿其他NMR读数中的不准确性，以提供总体改进的NMR对数。

公开(公告)号：US5424644A

公开(公告)日：1995-06-13

申请号：US83652

申请日：1993-06-25

申请人： Heinz D. Zeiger

发明人： Heinz D. Zeiger

IPC分类号： G01R33/30 ,  G01R33/343 ,  G01R33/38 ,  G01R33/20

CPC分类号： G01R33/343 ,  G01R33/30 ,  G01R33/3808

摘要： A probehead is described for carrying out magnetic resonance imaging measurements on a sample. The sample is located inside a probehead transmission/detection unit in a magnetic field of a predetermined direction. Moreover, the sample may be turned relative to the direction about at least one axis. The transmission/detection unit is a split ring resonator. The split ring resonator may be turned about its resonator axis and may be coupled by coupling means for coupling rf energy to or from, respectively, the split ring resonator. The coupling means are arranged in a stationary position relative to the split ring resonator and are coaxial to the resonator axis.

摘要翻译： 描述了用于对样品进行磁共振成像测量的探头。 样品位于预定方向的磁场内的探头传输/检测单元内。 此外，样品可以相对于围绕至少一个轴线的方向转动。 发送/检测单元是分离环谐振器。 分裂环谐振器可以围绕其谐振器轴线转动，并且可以通过用于将rf能量分别耦合到分离环谐振器或从分离环谐振器耦合的耦合装置耦合。 耦合装置相对于开环谐振器布置在静止位置，并且与谐振器轴线同轴。

公开(公告)号：US5424643A

公开(公告)日：1995-06-13

申请号：US80564

申请日：1993-06-21

申请人： Michael A. Morich ,  John L. Patrick ,  Gordon D. DeMeester

发明人： Michael A. Morich ,  John L. Patrick ,  Gordon D. DeMeester

IPC分类号： G01R33/20 ,  A61B5/055 ,  G01R33/34 ,  G01R33/385 ,  G01R33/421 ,  G01R33/422

CPC分类号： G01R33/34 ,  G01R33/385 ,  G01R33/422 ,  G01R33/3856 ,  G01R33/4215

摘要： A magnetic resonance imaging machine includes a toroidal vacuum dewer (24) which contains a superconducting magnet (10). A radio frequency coil (32) is mounted within a cylindrical bore (26) of the vacuum dewer. A cylindrical, dielectric former (46) supports an RF shield (34), a z-gradient coil (50), an x-gradient coil (52), and a y-gradient coil (54). The x and y-gradient coils are each composed of four like spiral coil constructions. A metallic layer is cut with cut lines (64) to define a generally spiral coil winding pattern. In a high current density region (68) in which the coil windings are narrower than a preselected width, the cut lines (76) are thinner. In lower current density regions (70), the cut lines (78) are thicker. In lower current density regions, two cut lines are defined between adjacent coil windings such that the coil windings are limited to a maximum width. Conductive islands (80) defined in the lower current density areas which are large enough to support detrimental eddy currents are preferably removed or at least modified such that their ability to support detrimental eddy currents is curtailed.

摘要翻译： 磁共振成像机包括含有超导磁体（10）的环形真空脱水器（24）。 射频线圈（32）安装在真空脱水器的圆柱形孔（26）内。 圆柱形电介质成形器（46）支撑RF屏蔽（34），z-梯度线圈（50），x-梯度线圈（52）和y-梯度线圈（54）。 x和y梯度线圈由四个类似的螺旋线圈结构组成。 用切割线（64）切割金属层以限定大致螺旋线圈绕组图案。 在其中线圈绕组比预选宽度窄的高电流密度区域（68）中，切割线（76）更薄。 在较低电流密度区域（70）中，切割线（78）较厚。 在较低的电流密度区域中，在相邻的线圈绕组之间限定两个切割线，使得线圈绕组被限制到最大宽度。 限定在足够大以支持有害涡流的较低电流密度区域中的导电岛（80）优选地被去除或至少被修改，使得它们支持有害涡流的能力受到限制。

公开(公告)号：US5410248A

公开(公告)日：1995-04-25

申请号：US174924

申请日：1993-12-29

申请人： Charles L. Dumoulin

发明人： Charles L. Dumoulin

IPC分类号： G01P5/18 ,  A61B5/055 ,  G01N24/00 ,  G01P13/00 ,  G01P15/08 ,  G01R33/20 ,  G01R33/563

CPC分类号： G01R33/56308 ,  G01P15/08 ,  G01R33/56316

摘要： A motion imaging method uses magnetic resonance to detect velocity, and an acceleration distribution within moving materials in a subject. Velocity encoding is performed by computing differences of data obtained with modulated motion-encoding magnetic field gradient pulses. Distributions of acceleration are measured responsive to a motion sensitive phase-encoding gradient pulse.

摘要翻译： 运动成像方法使用磁共振来检测被摄体内的移动材料内的速度和加速度分布。 通过计算通过调制的运动编码磁场梯度脉冲获得的数据的差异来执行速度编码。 响应于运动敏感相位编码梯度脉冲来测量加速度的分布。

公开(公告)号：US5396208A

公开(公告)日：1995-03-07

申请号：US957469

申请日：1992-10-06

申请人： Johannes A. Overweg ,  Gerardus N. Peeren

发明人： Johannes A. Overweg ,  Gerardus N. Peeren

IPC分类号： A61B5/055 ,  G01R33/20 ,  G01R33/38 ,  G01R33/381 ,  G01R33/3815 ,  G01R33/3873 ,  G01V3/00

CPC分类号： G01R33/3873 ,  G01R33/3815 ,  G01R33/3806

摘要： An extremely efficient magnet system having a comparatively large angle of aperture can be obtained for magnetic resonance imaging by a reduction of fields of all orders in a common approach affecting active and passive as well as positive and negative oriented coil elements. Passive soft-magnetic ring segments are arranged in two pairs and located within a plurality of larger diameter active magnetic coils. The active coils include a central coil and outer coils wherein the outer coils are smaller than the central coil. The coils are in a helium Dewar vessel and arranged such that the system has an aperture of about 90.degree.. The central active coil may have a larger radius than the smaller outer coils.

摘要翻译： 通过影响有源和无源以及正和负取向线圈元件的共同方法，可以通过减少所有阶数的场来获得具有相对较大的孔径角度的非常有效的磁体系统。 无源软磁环段被布置成两对并且位于多个较大直径的有源磁性线圈内。 有源线圈包括中心线圈和外线圈，其中外线圈小于中心线圈。 线圈在氦杜瓦容器中并且布置成使得系统具有约90°的孔径。 中心有源线圈可以具有比较小的外部线圈更大的半径。

公开(公告)号：US5381092A

公开(公告)日：1995-01-10

申请号：US127978

申请日：1993-09-28

申请人： Robert Freedman

发明人： Robert Freedman

IPC分类号： G01R33/44 ,  G01V3/32 ,  G01R33/20

CPC分类号： G01V3/32 ,  G01N24/081

摘要： A wellbore apparatus adapted to be disposed in a wellbore is electrically connected to a surface apparatus disposed at a surface of the wellbore. When disposed in the wellbore, the wellbore apparatus receives a plurality of input signals from an earth formation traversed by the wellbore which are representative of characteristics of the earth formation. The wellbore apparatus includes a data compression apparatus which receives the input signals and compresses the input signals prior to transmission of the compressed input signals uphole to the surface apparatus. The data compression apparatus compresses the input signals by first subdividing the plurality of input signals into a plurality of groups, where the number of the plurality of groups is much less than the number of the plurality of input signals, and then generating one value for each group. Therefore, a plurality of values corresponding, respectively, to the plurality of groups represent the compressed input signals transmitted uphole to the surface apparatus. In addition, since the plurality of values is much less in number than the plurality of input signals, the telemetry requirements needed to transmit the plurality of values uphole, relative to the telemetry requirements needed to transmit the plurality of input signals uphole, is substantially reduced.

摘要翻译： 适于设置在井眼中的井眼装置电连接到设置在井筒表面的表面装置。 当井筒设置在井筒中时，井筒装置接收来自代表地层特征的由井筒穿过的地层的多个输入信号。 井筒装置包括数据压缩装置，其在将压缩的输入信号上传到表面装置之前接收输入信号并压缩输入信号。 数据压缩装置通过首先将多个输入信号细分成多个组来压缩输入信号，其中多个组的数量远小于多个输入信号的数量，然后为每个组产生一个值 组。 因此，分别对应于多个组的多个值表示在井上传输到表面装置的压缩输入信号。 另外，由于多个数值比多个输入信号少得多，因此相对于向井上发送多个输入信号所需的遥测要求而将多个值向上传输所需的遥测要求大大减少 。

公开(公告)号：US5375598A

公开(公告)日：1994-12-27

申请号：US173022

申请日：1993-12-27

申请人： Charles L. Dumoulin ,  Lorinda R. Opsahl

发明人： Charles L. Dumoulin ,  Lorinda R. Opsahl

IPC分类号： G01P5/18 ,  A61B5/055 ,  G01N24/00 ,  G01P13/00 ,  G01R33/20 ,  G01R33/563

CPC分类号： G01R33/56308 ,  G01R33/56316

摘要： A shear rate imaging method uses magnetic resonance to detect the distribution of velocities within a subject. Distributions are measured responsive to at least two different field-of-views. Differences of the velocity distribution obtained with one field-of-view and the second field-of-view are computed to give a component of shear rate. The method can be used to obtain velocity measurements in any of three mutually orthogonal directions responsive to field-of-view shifts in as many as three mutually orthogonal directions to give a total of nine shear rate components. Data for each component can be acquired independently or data acquisition can be multiplexed to reduce data acquisition requirements.

摘要翻译： 剪切速率成像方法使用磁共振来检测受试者内的速度分布。 响应于至少两个不同的视野而测量分布。 计算用一个视场和第二视场获得的速度分布的差异，得到剪切速率的分量。 该方法可以用于在三个相互正交的方向中的任一个中获得速度测量，其响应于多达三个相互正交的方向上的视场偏移，以得到总共九个剪切速率分量。 可以独立地获取每个组件的数据，或者可以多路复用数据采集以减少数据采集的要求。