公开(公告)号：US20140062475A1

公开(公告)日：2014-03-06

申请号：US13603210

申请日：2012-09-04

申请人： Kevin Matthew Koch ,  Eric M. Printz

发明人： Kevin Matthew Koch ,  Eric M. Printz

IPC分类号： G01R33/56 ,  G01R33/341

CPC分类号： G01R33/56563 ,  G01R33/243

摘要： A method includes receiving a forward spatial encoding polarity magnetic resonance (MR) coil image and a reverse spatial encoding polarity MR coil image generated from data obtained with a magnetic field gradient that is reversed with respect to the magnetic field gradient with which the forward spatial encoding polarity MR coil image is acquired. The method also includes performing an iterative shift map calculation algorithm to determine a pixel shift map corresponding to a minimized difference between the forward and reverse spatial encoding polarity MR coil images, converting the pixel shift map into a magnetic field shift map by determining a magnetic field value corresponding to each pixel in the pixel shift map, and providing the magnetic field shift map as an input to a shim calculation process that includes determining a level of at least one shim current.

摘要翻译： 一种方法包括接收正向空间编码极性磁共振（MR）线圈图像和由相对于磁场梯度反转的磁场梯度获得的数据产生的反向空间编码极性MR线圈图像，所述磁场梯度与前向空间编码 获取极性MR线圈图像。 该方法还包括执行迭代移位映射计算算法以确定对应于正向和反向空间编码极性MR线圈图像之间的最小差异的像素移位图，通过确定磁场来将像素移位图转换为磁场移位图 对应于像素移位图中的每个像素的值，以及提供磁场移动图作为包括确定至少一个平均电流的电平的垫片计算处理的输入。

公开(公告)号：US20130147476A1

公开(公告)日：2013-06-13

申请号：US13324850

申请日：2011-12-13

申请人： Shmaryu Shvartsman ,  James Dempsey ,  Gordon DeMeester

发明人： Shmaryu Shvartsman ,  James Dempsey ,  Gordon DeMeester

IPC分类号： G01R33/58 ,  G01R33/341

CPC分类号： G01R33/3875 ,  G01R33/3642 ,  G01R33/3806 ,  G01R33/385 ,  G01R33/4808 ,  G01R33/481 ,  G01R33/4812 ,  G01R33/4814

摘要： Active resistive shim coil assemblies may be used in magnetic resonance imaging (MRI) systems to reduce in-homogeneity of the magnetic field in the imaging volume. Disclosed embodiments may be used with continuous systems, gapped cylindrical systems, or vertically gapped systems. Disclosed embodiments may also be used with an open MRI system and can be used with an instrument placed in the gap of the MRI system. An exemplary embodiment of the active resistive shim coil assembly of the present disclosure includes active resistive shim coils each operable to be energized by separate currents through a plurality of power channels. In some embodiments, the disclosed active resistive shim coil assemblies allow for various degrees of freedom to shim out field in-homogeneity.

摘要翻译： 有源电阻衬片线圈组件可用于磁共振成像（MRI）系统，以减小成像体积中磁场的均匀性。 公开的实施例可以与连续系统，间隙圆柱形系统或垂直间隙系统一起使用。 公开的实施例也可以与开放式MRI系统一起使用，并且可以与放置在MRI系统的间隙中的仪器一起使用。 本公开的有源电阻衬片线圈组件的示例性实施例包括有源电阻衬垫线圈，其可操作以由通过多个功率通道的分离电流激励。 在一些实施例中，所公开的主动阻抗衬片线圈组件允许不同程度的自由度来均匀地摆放场。

公开(公告)号：US20130127461A1

公开(公告)日：2013-05-23

申请号：US13679772

申请日：2012-11-16

申请人： Stefan Popescu

发明人： Stefan Popescu

IPC分类号： G01R33/341 ,  G01R33/48

CPC分类号： G01R33/341 ,  G01R33/3621 ,  G01R33/3692 ,  G01R33/48

摘要： A receive apparatus in a strong magnetic alternating field is disposed in a magnetic resonance tomography (MRT) system. The MRT system includes at least one receive apparatus for a magnetic resonance high frequency (MR-HF) signal. The receive apparatus includes a receive coil element for receiving the MR-HF signal, an optical modulator, in which an electrical control input is coupled to the receive coil element, and an optical output for outputting an output signal of the modulator. The optical modulator forms an optical demodulation device for the MR-HF signal. The optical modulator is coupled to a laser light source via an optical input that is configured to generate a laser light. A light intensity of the laser light varies periodically with a predetermined frequency.

摘要翻译： 强磁场中的接收装置设置在磁共振断层摄影（MRT）系统中。 MRT系统包括用于磁共振高频（MR-HF）信号的至少一个接收装置。 接收装置包括用于接收MR-HF信号的接收线圈元件，其中电控制输入耦合到接收线圈元件的光调制器和用于输出调制器的输出信号的光输出。 光调制器形成用于MR-HF信号的光解调装置。 光调制器经由被配置为产生激光的光输入端耦合到激光光源。 激光的光强度以预定频率周期性地变化。

公开(公告)号：US20130082709A1

公开(公告)日：2013-04-04

申请号：US13584126

申请日：2012-08-13

申请人： Alan R. RATH ,  Wai Ha WONG ,  Weston A. ANDERSON

发明人： Alan R. RATH ,  Wai Ha WONG ,  Weston A. ANDERSON

IPC分类号： G01R33/48 ,  G01R33/341

CPC分类号： G01R33/34076 ,  G01R33/5616

摘要： A magnetic resonance imaging (MRI) apparatus comprises a plurality of cylindrical electromagnetic coils arranged in a coaxial configuration around a sample region. The coils are used to capture resonance signals from a sample at different times according to a geometric echo effect. The measurements can then be combined to produce an MRI signal.

摘要翻译： 磁共振成像（MRI）装置包括以样品区域周围的同轴构造布置的多个圆柱形电磁线圈。 线圈用于根据几何回波效应在不同时间从样品捕获共振信号。 然后可以将测量结合以产生MRI信号。

公开(公告)号：US20130076352A1

公开(公告)日：2013-03-28

申请号：US13627042

申请日：2012-09-26

申请人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

发明人： Kai Tobias Block ,  Stephan Kannengiesser ,  Marcel Dominik Nickel

IPC分类号： G01R33/58 ,  G01R33/341

CPC分类号： G01R33/5611

摘要： In a method to select an undersampling scheme of k-space and an associated set of reconstruction kernels to acquire reduced magnetic resonance (MR) data sets with multiple coils, a calibration data set is acquired for each of the respective coils, a noise covariance is determined from autocorrelations and correlations of the noise of the various coils. At least one set of reconstruction kernels is calculated for each of the multiple undersampling schemes from the calibration data sets of the various coils. For each set of reconstruction kernels, a characteristic value is calculated from the noise covariance and the respective reconstruction kernels of the coils, with the characteristic value being proportional to a spatial mean value of a signal noise of an MR image. A selected undersampling scheme and a selected set of reconstruction kernels are selected based on the calculated characteristic values.

摘要翻译： 在选择k空间的欠采样方案和相关联的一组重建内核以获取具有多个线圈的减小的磁共振（MR）数据集的方法中，针对各个线圈获取校准数据集，噪声协方差为 根据各种线圈的噪声的自相关性和相关性确定。 根据各种线圈的校准数据集，对于多个欠采样方案中的每一个计算至少一组重构内核。 对于每组重建内核，根据噪声协方差和线圈的相应重建内核计算特征值，其特征值与MR图像的信号噪声的空间平均值成比例。 基于所计算的特征值来选择所选的欠采样方案和所选择的重构内核集合。

公开(公告)号：US20130049755A1

公开(公告)日：2013-02-28

申请号：US13593546

申请日：2012-08-24

申请人： Timothy James HOLLIS ,  Fengshun Tan

发明人： Timothy James HOLLIS ,  Fengshun Tan

IPC分类号： G01R33/341

CPC分类号： G01R33/385 ,  G01R33/3854 ,  G01R33/4215 ,  H01F6/06

摘要： A gradient coil is provided. The gradient coil comprises: a first layer comprised of a first plurality of turns of wires; and a second layer of coil comprised of a second plurality of turns of wires. Each turn of wire in the first and second plurality of turns of wires circles along the side walls of a cylindrical substrate and each turn of wire in the first and second plurality of turns of wires include a first portion wound along the inner side wall of the substrate and a second portion wound along the outer side wall of the substrate.

摘要翻译： 提供梯度线圈。 梯度线圈包括：第一层，由第一多圈线组成; 以及由第二多圈线组成的第二层线圈。 第一和第二多圈线中的线的每一圈都沿着圆柱形基板的侧壁圆周，并且第一和第二多圈线中的每根线都包括沿着第一和第二多个线的内侧壁缠绕的第一部分 衬底和沿衬底的外侧壁缠绕的第二部分。

公开(公告)号：US20130009645A1

公开(公告)日：2013-01-10

申请号：US13636979

申请日：2011-03-25

申请人： Takashi Miki

发明人： Takashi Miki

IPC分类号： G01R33/341

CPC分类号： G01R33/307 ,  G01R33/34092 ,  G01R33/3804 ,  G01R33/3875

摘要： A compact flow-through NMR analyzer with high NMR signal detection sensitivity is provided. The flow-through NMR analyzer comprises: a solution feeding pipe 18 for flowing a sample fed from a solution feeding pump 6; a superconducting magnet 7 that encloses a housing space, which is surrounded by a side wall of the solution feeding pipe 18, around an axis of the solution feeding pipe 18 such that a static magnetic field is generated along the axis of the solution feeding pipe 18; a vacuum container 12 which houses the superconducting magnet 7 in a cooled state and which encloses the housing space around the axis of the solution feeding pipe 18; and an RF coil 22 which applies high-frequency electromagnetic waves to the sample inside the housing space and which detects an NMR signal from the sample. The RF coil 22 is integrally formed with the side wall of the solution feeding pipe 18 in a region of the solution feeding pipe 18 that is enclosed by the superconducting magnet 7 and the magnetic field correcting coil 4c.

摘要翻译： 提供具有高NMR信号检测灵敏度的紧凑型流通NMR分析仪。 流通式NMR分析仪包括：用于使从溶液供给泵6供给的样品流动的溶液供给管18; 围绕溶液供给管18的轴线包围由溶液供给管18的侧壁包围的容纳空间的超导磁体7，使得沿着溶液供给管18的轴线产生静磁场 ; 真空容器12，其将超导磁体7容纳在冷却状态并围绕溶液供给管18的轴线包围容纳空间; 以及将高频电磁波施加到容纳空间内的样品并检测来自样品的NMR信号的RF线圈22。 RF线圈22与溶液供给管18的侧壁一体地形成在由超导磁体7和磁场校正线圈4c包围的溶液供给管18的区域中。

公开(公告)号：US20120280685A1

公开(公告)日：2012-11-08

申请号：US13465864

申请日：2012-05-07

申请人： J. Rock Hadley ,  Dennis L. Parker ,  Glen R. Morrell

发明人： J. Rock Hadley ,  Dennis L. Parker ,  Glen R. Morrell

IPC分类号： G01R33/341 ,  G01R33/54

CPC分类号： G01R33/3456 ,  G01R33/34 ,  G01R33/34076 ,  G01R33/3415

摘要： Systems, devices and methods provide an RF coil which produces a field having linear phase variation across an imaging volume. In one embodiment, a coil comprises multiple microstrip elements configured to have an increased effective electrical length. This increase in electrical length allows for a larger linear phase shifts over the length of the microstrip element which in turn increases linear phase variation capabilities. This may be accomplished by increasing the effective dielectric properties of the microstrip element. Increasing the effective dielectric may be accomplished by utilizing distributed capacitors along the length of a microstrip element (e.g. lumped element capacitors), by altering the materials used to fabricate the microstrip element, etc. Additionally, increasing the effective dielectric may be accomplished using a combination of these means. Embodiments may further enable linear phase variation along the imaging volume at high frequencies, such as frequencies utilized for 3 T and above MRI devices.

摘要翻译： 系统，装置和方法提供RF线圈，其产生在成像体积上具有线性相位变化的场。 在一个实施例中，线圈包括配置成具有增加的有效电长度的多个微带元件。 电长度的这种增加允许在微带线元件的长度上产生较大的线性相移，这又增加了线性相位变化能力。 这可以通过增加微带元件的有效介电性能来实现。 通过改变用于制造微带线元件的材料等，通过利用沿着微带元件（例如集总元件电容器）的长度的分布式电容器来实现增加有效电介质。另外，增加有效电介质可以使用组合 的这些手段。 实施例还可以在诸如用于3T及以上MRI装置的频率的高频下沿成像体积进行线性相位变化。

公开(公告)号：US20120161772A1

公开(公告)日：2012-06-28

申请号：US13171422

申请日：2011-06-28

申请人： Stephan Biber ,  Markus Vester

发明人： Stephan Biber ,  Markus Vester

IPC分类号： G01R33/341

CPC分类号： G01R33/3415 ,  G01R33/34007 ,  G01R33/34015 ,  G01R33/34023

摘要： The present embodiments relates to a magnetic resonance tomography system having a coil system. The coil system includes an upper part having at least one antenna and a lower part having at least one antenna. The upper part of the coil arrangement is disposed above a bore for receiving an examination subject. The lower part of the coil arrangement is disposed below a field of view of the magnetic resonance tomography system. The lower part of the coil arrangement is closer to the examination subject than the upper part of the coil arrangement.

摘要翻译： 本实施例涉及具有线圈系统的磁共振断层摄影系统。 线圈系统包括具有至少一个天线的上部和具有至少一个天线的下部。 线圈装置的上部设置在用于接收检查对象的孔的上方。 线圈装置的下部设置在磁共振断层摄影系统的视场的下方。 线圈装置的下部比线圈装置的上部更靠近检查对象。

公开(公告)号：US20120081115A1

公开(公告)日：2012-04-05

申请号：US13376615

申请日：2010-05-17

申请人： Arne Reykowski

发明人： Arne Reykowski

IPC分类号： G01R33/48 ,  G01R33/341

CPC分类号： G01R33/3415 ,  G01R33/3657 ,  G01R33/3664

摘要： A radiofrequency (RF) coil assembly (18,18′) for use in a magnetic resonance system (10) includes a radiofrequency coil (42) and a plurality of memory resistive elements (46,56,62,72) which each retains a selected resistive state after a control signal is removed. A detune circuit (44), part of the radiofrequency coil assembly, includes a memory resistive element (46) which switches the radiofrequency coil between a tuned and detuned state. Connected between the radiofrequency coil and a pre-amplifier (52), a blanking circuit (54) includes a memory resistive element (56) to short circuit an input of the pre-amplifier. A multiplexing circuit (60) includes a plurality of memory resistive elements (62) to selectively couple the selected outputs of the radiofrequency coils to a receiver (26). A biasing circuit (27) generates the control signal to set the memory resistive elements (46,56) to a first resistive state during a transmit mode and to a second resistive state during a receive mode magnetic resonance system.

摘要翻译： 用于磁共振系统（10）的射频（RF）线圈组件（18,18'）包括射频线圈（42）和多个存储电阻元件（46,56,62,72），每个存储电阻元件保持 控制信号被去除后选择的电阻状态。 射频线圈组件的一部分的失谐电路（44）包括在调谐和失谐状态之间切换射频线圈的存储电阻元件（46）。 消声电路（54）连接在射频线圈和前置放大器（52）之间，包括用于使前置放大器的输入短路的存储器电阻元件（56）。 多路复用电路（60）包括多个存储电阻元件（62），用于选择性地将所选射频线圈的输出耦合到接收器（26）。 偏置电路（27）产生控制信号，以在发射模式期间将存储电阻元件（46,56）设置为第一电阻状态，并在接收模式磁共振系统期间产生第二电阻状态。