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1. 发明授权

US5212450A Radio frequency volume resonator for nuclear magnetic resonance 失效
标题翻译：用于核磁共振的无线电频率共振器
公开(公告)号：US5212450A
公开(公告)日：1993-05-18
申请号：US603947
申请日：1990-10-25
申请人： Joseph Murphy-Boesch , Ravi Srinivasan , Lucas Carvajal
发明人： Joseph Murphy-Boesch , Ravi Srinivasan , Lucas Carvajal
IPC分类号： A61B5/055 , G01R33/34 , G01R33/36
CPC分类号： G01R33/34046
摘要： An RF resonator mounted on a dielectric support is operated in quadrature at a selected NMR frequency. The resonator consists of four axially distributed high frequency ring current paths on the support and at least four high frequency current paths interconnect each pair of adjacent ring paths. In the preferred embodiment at least sixteen equally spaced parallel segments connect each ring pair and are aligned with one another. The ring segments between the parallel segments together with the parallel segments form loops. At least one discrete capacitor is placed in each outer current loop thereby interrupting the loop. However, this is done so that no inner loop is interrupted by a capacitor. By using quadrature input/output coupling, either inductive or capacitive, a co-rotating mode is excited in the two outer loops through the inner loops providing a highly uniform field across the resonator.
摘要翻译：安装在电介质载体上的RF谐振器以选定的NMR频率正交地工作。谐振器由支撑上的四个轴向分布的高频环路电流路径组成，并且至少四个高频电流路径互连每对相邻环路径。在优选实施例中，至少十六个等间隔的平行段连接每个环对并且彼此对准。平行段之间的环段与平行段一起形成环。每个外部电流环中至少放置一个分立电容器，从而中断环路。然而，这样做是为了使内部环路不被电容器中断。通过使用正交输入/输出耦合，无论是电感还是电容耦合，在两个外环中通过内环激励同向旋转模式，从而在谐振器上提供高度均匀的场。

2. 发明授权

US5202635A Radio frequency volume resonator for nuclear magnetic resonance 失效
标题翻译：用于核磁共振的无线电频率共振器
公开(公告)号：US5202635A
公开(公告)日：1993-04-13
申请号：US642411
申请日：1991-01-17
申请人： Ravi Srinivasan , Joseph Murphy-Boesch
发明人： Ravi Srinivasan , Joseph Murphy-Boesch
IPC分类号： A61B5/055 , G01R33/34 , G01R33/36
CPC分类号： G01R33/34046
摘要： A radio frequency volume resonator mounted on a generally cylindrical dielectric support can be operated in quadrature at one or more NMR frequencies. The resonator consists of four axially distributed high frequency ring current paths and a dielectric support, at least four high frequency current paths interconnect each pair of adjacent ring paths, at least one discrete capacitor is placed in each current loop but arranged so that none of the ring current paths is interrupted by a capacitor.
摘要翻译：安装在大致圆柱形电介质支撑件上的射频体积谐振器可以在一个或多个NMR频率下正交地操作。谐振器由四个轴向分布的高频环路电流路径和介质支撑件组成，至少四个高频电流路径互连每对相邻环路径，至少一个分立电容器放置在每个电流环路中，但是布置成使得环路电流路径被电容器中断。

3. 发明授权

US5194811A Radio frequency volume resonator for nuclear magnetic resonance 失效
标题翻译：用于核磁共振的无线电频率共振器
公开(公告)号：US5194811A
公开(公告)日：1993-03-16
申请号：US561898
申请日：1990-08-02
申请人： Joseph Murphy-Boesch , Ravi Srinivasan
发明人： Joseph Murphy-Boesch , Ravi Srinivasan
IPC分类号： A61B5/055 , G01R33/34 , G01R33/36 , G01R33/46
CPC分类号： G01R33/3635 , G01R33/34046
摘要： A radio frequency volume resonator mounted on a dielectric support can be operated in quadrature at one or more NMR frequencies. The resonator consists of four axially distributed high frequency ring current paths on the dielectric support. At least four high frequency current paths interconnect each pair of adjacent ring paths. The ring segments with interconnecting segments form loops. At least one discrete capacitor is placed in each loop.
摘要翻译：安装在电介质载体上的射频体积谐振器可以在一个或多个NMR频率下正交地操作。谐振器由电介质支撑上的四个轴向分布的高频环路电流路径组成。至少四个高频电流路径互连每对相邻的环路径。具有互连段的环段形成环路。每个回路中至少放置一个分立电容器。

4. 发明申请

US20050166667A1 Rheometer for rapidly measuring small quantity samples 失效
标题翻译：用于快速测量小批量样品的流变仪
公开(公告)号：US20050166667A1
公开(公告)日：2005-08-04
申请号：US11090755
申请日：2005-03-25
申请人： Damian Hajduk , Eric Carlson , Ravi Srinivasan
发明人： Damian Hajduk , Eric Carlson , Ravi Srinivasan
IPC分类号： G01N19/00 , G01L1/16 , G01L1/24 , G01N3/02 , G01N3/24 , G01N11/14 , G01N11/16
CPC分类号： G01N3/24 , G01N11/16 , G01N2203/0051 , G01N2203/0286 , G01N2203/0623
摘要： The present invention relates to a miniature rheometer, a parallel rheometer, and improved force sensor elements which may advantageously be used in combination with the miniature rheometer and the parallel rheometer. The miniature rheometer is adapted to determine rheological characteristics of materials which are provided in the form of small quantity samples. The miniature rheometer comprises an actuating element, a sensing element and a feedback circuit to provide rebalance of the shear force applied by the sample to the sensing element, which insures an exceptional stiffness in determining the shear strain so as to allow measurements of high accuracy. The parallel rheometer of the present invention allows simultaneous measurements of a plurality of samples so as to allow of a plurality of samples within a short time period. The force sensor element according to the present invention allows simultaneous measurement of a shear force and a normal force applied to the sensor element. Moreover, a rheometer is provided which comprises a force sensor based on stress-optic material.
摘要翻译：本发明涉及微型流变仪，平行流变仪和改进的力传感器元件，其可有利地与微型流变仪和平行流变仪组合使用。微型流变仪适用于确定以少量样品形式提供的材料的流变特性。微型流变仪包括致动元件，感测元件和反馈电路，以提供由样品施加到感测元件的剪切力的重新平衡，这确保了确定剪切应变的特殊刚度，以便允许高精度的测量。本发明的并行流变仪允许多个样本的同时测量，以便在短时间内允许多个样本。根据本发明的力传感器元件允许同时测量施加到传感器元件的剪切力和法向力。此外，提供了一种流变仪，其包括基于应力光学材料的力传感器。

5. 发明授权

US06823507B1 Detection of memory-related errors in computer programs 失效
标题翻译：检测计算机程序中的内存相关错误
公开(公告)号：US06823507B1
公开(公告)日：2004-11-23
申请号：US09587924
申请日：2000-06-06
申请人： Ravi Srinivasan , Usha Kiran , Navin Kumar Sinha
发明人： Ravi Srinivasan , Usha Kiran , Navin Kumar Sinha
IPC分类号： G06F945
CPC分类号： G06F11/3604 , G06F8/443
摘要： A method, an apparatus, and a computer program product are disclosed for detecting memory-related errors in a computer program during compiling of the computer program. In the method, static analysis is performed upon a computer program. One or more conditions in the computer program are computed based on the static analysis. Each condition is a test for checking a memory access in the computer program and can be either a pre- or post-condition. The validity of each condition in the computer program is then evaluated. If the evaluation is determinate during compiling, the presence or absence of memory-related errors in the computer program is reported. A condition is determinate if the condition is valid or invalid during compiling. Otherwise, computer code based on the condition is generated for incorporation in the computer program for run-time detection of memory-related errors.
摘要翻译：公开了一种方法，装置和计算机程序产品，用于在计算机程序的编译期间检测计算机程序中的存储器相关错误。在该方法中，在计算机程序上执行静态分析。基于静态分析计算计算机程序中的一个或多个条件。每个条件都是用于检查计算机程序中的存储器访问的测试，可以是前一个或后一个条件。然后评估计算机程序中每个条件的有效性。如果评估在编译期间是确定的，则报告计算机程序中是否存在与内存有关的错误。条件在编译期间是否有效或无效。否则，生成基于条件的计算机代码，用于并入计算机程序中用于运行时检测与存储器相关的错误。

6. 发明授权

US06644101B2 Rheometer for rapidly measuring small quantity samples 失效
公开(公告)号：US06644101B2
公开(公告)日：2003-11-11
申请号：US10261945
申请日：2002-10-01
申请人： Damian Hajduk , Eric Carlson , Ravi Srinivasan
发明人： Damian Hajduk , Eric Carlson , Ravi Srinivasan
IPC分类号： G01N1110
CPC分类号： G01N3/24 , G01N11/16 , G01N2203/0051 , G01N2203/0286 , G01N2203/0623
摘要： The present invention relates to a miniature rheometer, a parallel rheometer, and improved force sensor elements which may advantageously be used in combination with the miniature rheometer and the parallel rheometer. The miniature rheometer is adapted to determine rheological characteristics of materials which are provided in the form of small quantity samples. The miniature rheometer comprises an actuating element, a sensing element and a feedback circuit to provide rebalance of the shear force applied by the sample to the sensing element, which insures an exceptional stiffness in determining the shear strain so as to allow measurements of high accuracy. The parallel rheometer of the present invention allows simultaneous measurements of a plurality of samples so as to allow of a plurality of samples within a short time period. The force sensor element according to the present invention allows simultaneous measurement of a shear force and a normal force applied to the sensor element. Moreover, a rheometer is provided which comprises a force sensor based on stress-optic material.

7. 发明授权

US06029082A Less-claustrophobic, quadrature, radio-frequency head coil for nuclear magnetic resonance 失效
标题翻译：用于核磁共振的不幽闭，正交，射频头线圈
公开(公告)号：US06029082A
公开(公告)日：2000-02-22
申请号：US976857
申请日：1997-11-24
申请人： Ravi Srinivasan , Haiying Liu , Robert A. Elek
发明人： Ravi Srinivasan , Haiying Liu , Robert A. Elek
IPC分类号： G01R33/34 , A61B5/055
CPC分类号： G01R33/34046 , G01R33/34084
摘要： A less-claustrophobic, quadrature, radio-frequency head coil (42) includes first and second broken end rings (90, 92) connected to each other in parallel by a plurality of leg conductors (94). At least two of the leg conductors are interconnected by a third arcuate conductor segment (98) axially displaced from planes of the first and second end rings to provide an opening (44) over a subject's face. The opening reduces patient claustrophobia and permits access to the patient for life-support devices or the practice of interventional medicine. The end rings have a fixed capacitance (C.sub.1, C.sub.2) between each pair of leg conductors. The fixed capacitance C.sub.1 between at least one pair of leg conductors and the fixed capacitance C.sub.2 between at least the pair of leg conductors adjacent the opening, where C.sub.2 >C.sub.1. A two-port feed (66, 68) circumferentially attached to the coil generally opposite the opening matches the individual linear modes. Thus, the radio frequency coil is able to maintain two preferred principal linear modes (A, B) across the open area of the coil.
摘要翻译：较不幽闭的正交射频头线圈（42）包括通过多个腿导体（94）并联连接的第一和第二断开端环（90,92）。至少两个腿导体通过从第一和第二端环的平面轴向移位的第三弓形导体段（98）互连，以在对象的表面上提供开口（44）。开幕式可减少患者幽闭恐惧症，并允许进入患者的生命支持设备或介入医学的实践。端环在每对腿导体之间具有固定电容（C1，C2）。在至少一对腿导体之间的固定电容C1和固定电容C2之间至少一对腿导体相邻开口，其中C2> C1。周向地连接到与开口相对的线圈的两端口馈送（66,68）与各个线性模式匹配。因此，射频线圈能够在线圈的开放区域上保持两个优选的主线性模式（A，B）。

8. 发明授权

US5777474A Radio-frequency coil and method for resonance imaging/analysis 失效
公开(公告)号：US5777474A
公开(公告)日：1998-07-07
申请号：US745893
申请日：1996-11-08
申请人： Ravi Srinivasan
发明人： Ravi Srinivasan
IPC分类号： G01R33/34 , G01R33/341 , G01R33/36 , G01R33/422 , G01V3/00
CPC分类号： G01R33/3628 , G01R33/34046 , G01R33/422 , G01R33/341 , G01R33/3635
摘要： An RF coil which includes an RF coil primary, an RF coil secondary, and coupling impedances that connect the two at several points along the coil peripheries. The coupling impedances are primarily reactive, and may be fixed or variable, depending on the purpose of use.

9. 发明授权

US5680047A Multipl-tuned radio frequency coil for simultaneous magnetic resonance imaging and spectroscopy 失效
标题翻译：用于同时磁共振成像和光谱学的多调谐射频线圈
公开(公告)号：US5680047A
公开(公告)日：1997-10-21
申请号：US514396
申请日：1995-08-11
申请人： Ravi Srinivasan , Haiying Liu , Robert A. Elek
发明人： Ravi Srinivasan , Haiying Liu , Robert A. Elek
IPC分类号： G01R33/48 , A61B5/055 , G01R33/36 , G01V3/00
CPC分类号： G01R33/3635
摘要： A magnetic resonance system is used to excite high .gamma. dipoles, such as hydrogen, and lower .gamma. dipoles, such as phosphorous, to resonate concurrently. A multiply-tuned radio frequency coil (40) is disposed around the region of interest. The multiply-tuned radio frequency coil is tuned to the resonance frequency of the high .gamma. dipoles and the resonance frequency of the low .gamma. dipoles. The coil has an inner coil section, defined by a first leg or ring (92) and a second leg or ring (94), which is tuned by added capacitance substantially to the resonance frequency of the low .gamma. dipole. A first outer coil section which is defined by a third leg or ring (90) and the first leg or ring. A second outer coil section defined by the second leg or ring (94) and a fourth leg or ring (96). The first and second outer sections, together with the inner coil section define a coil which has a co-rotating mode and a counter-rotating mode. Added capacitance is sized such that one of the co-rotating and counter-rotating modes is at the high .gamma. resonance frequencies. In this manner, a multiply-tuned radio frequency coil is defined which is simultaneously tuned to at least two resonance frequencies. Separate pick-ups (130, 132) for the high and low resonance frequencies enable both signals to be received (66, 70) simultaneously for reconstruction (74) into image representations.
摘要翻译：磁共振系统用于激发高伽马偶极子（例如氢）和较低伽马偶极子（例如磷），以同时谐振。多重调谐射频线圈（40）围绕感兴趣的区域设置。多调谐射频线圈被调谐到高伽马偶极子的共振频率和低伽马偶极子的共振频率。线圈具有由第一腿或环（92）和第二腿或环（94）限定的内部线圈段，其通过基本上与低伽马偶极子的谐振频率相加的电容来调谐。由第三腿或环（90）和第一腿或环限定的第一外部线圈段。由第二支腿或环（94）和第四支腿或环（96）限定的第二外线圈段。第一和第二外部部分与内部线圈部分一起限定具有同向旋转模式和反向旋转模式的线圈。增加的电容的尺寸使得同向旋转模式和反向旋转模式之一处于高伽马共振频率。以这种方式，定义了被调谐到至少两个谐振频率的多调谐射频线圈。用于高和低共振频率的单独拾取（130,132）使得两个信号能够同时被接收（66,70）用于重建（74）成图像表示。

10. 发明授权

US5664568A Split-top, neck and head vascular array for magnetic resonance imaging 失效
标题翻译：分裂顶部，颈部和头部血管阵列用于磁共振成像
公开(公告)号：US5664568A
公开(公告)日：1997-09-09
申请号：US512722
申请日：1995-08-08
申请人： Ravi Srinivasan , Robert G. Henderson , Robert A. Elek
发明人： Ravi Srinivasan , Robert G. Henderson , Robert A. Elek
IPC分类号： A61B5/055 , G01R33/34 , G01R33/36
CPC分类号： G01R33/3657 , G01R33/34046 , G01R33/34007 , G01R33/3685
摘要： A coil assembly (40) includes a first, birdcage type head coil assembly (42) dimensioned to receive a patient's head and a second, neck coil assembly (44) including an anterior coil portion (44a) and a posterior coil portion (44b) dimensioned to receive the patient's neck region. The head and neck coils are partially overlapped. A first cable extends (98a) from the anterior coil portion past the birdcage head coil assembly and a second coaxial cable (98b) extends from the posterior portion past the birdcage head coil assembly. A first decoupling circuit (104a) is disposed in the first coaxial cable beyond a guard ring (106) and a second decoupling circuit (104b) is disposed in the second coaxial cable adjacent the region of overlap between the head and neck coil assemblies. The decoupling circuits are positioned and tuned to prevent radio frequency communication along the coaxial cable sheath between the head and neck coil assemblies. The head and neck coil assemblies are mounted in the mechanical housing which is openable such that an upper half of the guard ring and the birdcage coil and the anterior coil are removable as a unit from the lower half of the guard ring and birdcage coil and the posterior neck coil to facilitate patient access.
摘要翻译：线圈组件（40）包括第一鸟笼型头部线圈组件（42），其尺寸设置成接收病人的头部;以及包括前部线圈部分（44a）和后部线圈部分（44b）的第二颈部线圈组件（44）尺寸用于接收患者的颈部区域。头颈部线圈部分重叠。第一缆线从前线圈部分延伸穿过鸟笼头线圈组件（98a），并且第二同轴电缆（98b）从后部延伸穿过鸟笼头线圈组件。第一去耦电路（104a）设置在第一同轴电缆中超过保护环（106），并且第二去耦电路（104b）设置在邻近头颈线圈组件之间的重叠区域的第二同轴电缆中。去耦电路被定位和调谐以防止头颈线圈组件之间沿同轴电缆护套的射频通信。头颈线圈组件安装在机械壳体中，其可打开，使得保护环的上半部分和鸟笼线圈和前线圈作为一个单元可从保护环和鸟笼线圈的下半部分移除，并且后颈线圈以方便患者进入。

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