公开(公告)号：US20100033180A1

公开(公告)日：2010-02-11

申请号：US12535784

申请日：2009-08-05

申请人： Stephan Biber ,  Thorsten Speckner

发明人： Stephan Biber ,  Thorsten Speckner

IPC分类号： G01R33/48 ,  G01R33/44

CPC分类号： G01R33/583 ,  G01R33/3415 ,  G01R33/3614

摘要： In a method for calibration of a magnetic resonance acquisition channel having a magnetic resonance acquisition antenna in a magnetic resonance system, in a test signal is emitted by the transmission antenna in the magnetic resonance system and is received by the acquisition antenna. Acquisition channel calibration data for the appertaining magnetic resonance acquisition channel are determined on the basis of the received test signal. The method can be implemented by a calibration data determination device for a magnetic resonance system as well as by a magnetic resonance system itself.

摘要翻译： 在用于在磁共振系统中具有磁共振采集天线的磁共振采集通道的校准方法中，测试信号由发射天线在磁共振系统中发射并由采集天线接收。 基于所接收的测试信号确定适用于磁共振获取通道的采集通道校准数据。 该方法可以由用于磁共振系统的校准数据确定装置以及磁共振系统本身来实现。

公开(公告)号：US20090012736A1

公开(公告)日：2009-01-08

申请号：US12166745

申请日：2008-07-02

申请人： Thomas Arnold ,  Swen Campagna

发明人： Thomas Arnold ,  Swen Campagna

IPC分类号： G01R33/58 ,  G01R33/28

CPC分类号： G01R33/583 ,  G01R33/543 ,  G01R33/56375 ,  G01R33/56383

摘要： A method for spatially-dependent adjustment of system parameters of a magnetic resonance apparatus given continuous movement of an examination subject through a measurement volume of the magnetic resonance apparatus includes the following steps: (a) starting a measurement in the measurement volume of the magnetic resonance apparatus with a system parameter set, wherein the examination subject is located at a first position, (b) acquisition of measurement data, (c) storage of the system parameter values of the system parameter set with a respective position of the examination subject in a magnetic resonance apparatus at the point in time of a use of the respective system parameter of the system parameter set during the measurement, (d) evaluation of the acquired measurement data in regards to the effect achieved with the employed system parameter values, (e) adaptation of the system parameter values of the system parameter set under consideration of the evaluation of the last measurement such that, assuming idealized relationships between the system parameters and the respective effect, the respective effect corresponds to a target value, (f) starting a new measurement in the measurement volume of the magnetic resonance apparatus with the system parameter set with the adapted system parameter values, wherein the examination subject is located at an altered position, and (g) repetition of the steps b) through f) until the examination subject to be examined was completely examined.

摘要翻译： 一种通过磁共振装置的测量体积给予检查对象的连续移动的磁共振装置的系统参数的空间相关调整方法包括以下步骤：（a）在磁共振测量体积中开始测量 具有系统参数设置的装置，其中所述检查对象位于第一位置，（b）获取测量数据，（c）将所述系统参数集的系统参数值与所述检查对象的相应位置的存储在 在使用测量期间设定的系统参数的各个系统参数的时间点的磁共振装置，（d）评估所获取的测量数据与采用的系统参数值的效果有关，（e） 适应系统参数值的系统参数值，考虑到最后测量的评估 t，使得假设系统参数和相应效果之间的理想化关系，各自的效果对应于目标值，（f）以具有适配系统的系统参数设置的磁共振装置的测量体积开始新的测量 参数值，其中检查对象位于改变的位置，（g）重复步骤b）至f），直到检查被检查被检查完毕。

公开(公告)号：US20080231280A1

公开(公告)日：2008-09-25

申请号：US12052835

申请日：2008-03-21

申请人： Helmut Greim ,  Steffen Wolf

发明人： Helmut Greim ,  Steffen Wolf

IPC分类号： G01R33/32

CPC分类号： G01R33/583 ,  G01R33/246 ,  G01R33/341 ,  G01R33/3642 ,  G01R33/3664 ,  G01R33/422 ,  G01R33/5612 ,  G01R33/5659

摘要： In a method and arrangement for local manipulation of a B1 field in a first region of an examination subject in an examination volume of a magnetic resonance system, a B1 measurement value that represents the B1 field in the sub-volume during an adjustment measurement is integrally determined, and in desired radio-frequency signal parameters for a subsequent magnetic resonance measurement are predetermined on the basis of the determined B1 measurement value. At least during the adjustment measurement, the B1 field is influenced within a second region counter to the manipulation intended in the first region by means of an auxiliary coil element which is arranged in or at the second region of the sub-volume remote from the first region.

摘要翻译： 在用于在磁共振系统的检查体积中的检查对象的第一区域中的B 1＆lt; 1＆gt;场的局部操纵的方法和装置中，B 1 <测量值 在调整测量期间代表子体积中的B 1 SUB字段被一体地确定，并且在所确定的用于随后的磁共振测量的所需射频信号参数中基于确定的B < SUB> 1 测量值。 至少在调整测量期间，B＆lt; 1＆gt;场在与第一区域内的操作相反的第二区域内受到辅助线圈元件的影响，该辅助线圈元件被布置在第二区域 子音量远离第一个区域。

公开(公告)号：US07403004B2

公开(公告)日：2008-07-22

申请号：US10595582

申请日：2004-10-07

申请人： Michael A. Morich ,  Gordon D. DeMeester ,  Zhiyong Zhai

发明人： Michael A. Morich ,  Gordon D. DeMeester ,  Zhiyong Zhai

IPC分类号： G01V3/00

CPC分类号： G01R33/583 ,  G01R33/4835

摘要： Multi-slice magnetic resonance imaging of a region of interest of an imaging subject (16) is performed using a radio frequency coil (40) arranged to generate a B1 magnetic field in the region of interest. One or more processors (44, 82, 88, 110) determine a B1 field value for each slice that is representative of the B1 field over a selected area of the slice, accounting for subject effects on the BI field, and determine an adjusted per-slice radio frequency excitation for each slice that adjusts the B1 field value for the slice to a selected value. A magnetic resonance imaging system (10, 44, 46, 50, 52) acquires magnetic resonance imaging data for each slice using the adjusted per-slice radio frequency excitation for that slice. A reconstruction processor (58) reconstructs the acquired magnetic resonance imaging data into a reconstructed image representation.

摘要翻译： 使用布置成在感兴趣区域中产生B 1磁场的射频线圈（40）来执行成像对象（16）感兴趣区域的多层磁共振成像。 一个或多个处理器（44,82,88,110）确定代表在片段的选定区域上的B1字段的每个片段的B1字段值，以考虑BI字段上的对象影响，并且确定每个 对于每个切片，将切片的B SUB字段值调整为选定的值，以实现 - 射线射频激励。 磁共振成像系统（10,44,46,50,52）使用针对该切片的调节的每切片射频激励获取每个切片的磁共振成像数据。 重建处理器（58）将所获取的磁共振成像数据重建为重建图像表示。

公开(公告)号：US20080150528A1

公开(公告)日：2008-06-26

申请号：US11614798

申请日：2006-12-21

申请人： Charles H. Cunningham ,  Krishna S. Nayak ,  John M. Pauly

发明人： Charles H. Cunningham ,  Krishna S. Nayak ,  John M. Pauly

IPC分类号： G01V3/14

CPC分类号： G01R33/583 ,  G01R33/246 ,  G01R33/446 ,  G01R33/4824 ,  G01R33/4835 ,  G01R33/5607 ,  G01R33/561

摘要： For in vivo magnetic resonance imaging at high field (≧3 T) it is essential to consider the homogeneity of the active B1 field (B1+), particularly if surface coils are used for RF transmission. A new method is presented for highly rapid B1+ magnitude mapping. It combines the double angle method with a B1-insensitive magnetization-reset sequence such that the choice of repetition time (TR) is independent of T1 and with a multi-slice segmented (spiral) acquisition to achieve volumetric coverage with adequate spatial resolution in a few seconds.

摘要翻译： 对于在高场（> = 3T）下的体内磁共振成像，必须考虑活性B 1区域（B 1 + 1）的均匀性，特别是如果 表面线圈用于RF传输。 提出了一种用于高度快速的B＆lt; 1＆gt; +幅度映射的新方法。 它将双重角度方法与B 1敏感磁化复位序列相结合，使得重复时间（TR）的选择与T 1> 1不相关， 切片分段（螺旋）采集，在几秒钟内实现足够的空间分辨率的体积覆盖。

公开(公告)号：US07282914B2

公开(公告)日：2007-10-16

申请号：US10560870

申请日：2004-06-30

申请人： Michael A. Morich ,  Paul R. Harvey ,  Zhiyong Zhai ,  Gordon D. DeMeester

发明人： Michael A. Morich ,  Paul R. Harvey ,  Zhiyong Zhai ,  Gordon D. DeMeester

IPC分类号： G01V3/00

CPC分类号： G01R33/28 ,  A61B5/055 ,  G01R33/288 ,  G01R33/583

摘要： An MRI apparatus is provided. The apparatus includes a main magnet for generating a main magnetic field in an examination region, a plurality of gradient coils for generating gradient fields within the main field, an RF transmit coil for transmitting RF signals into the examination region and exciting magnetic resonance in a subject disposed therein in accordance with a plurality of imaging parameters, the transmitted RF signals having a SAR associated therewith, and a SAR processor for maintaining the transmitted RF signals below a prescribed SAR level.

摘要翻译： 提供MRI装置。 该装置包括用于在检查区域中产生主磁场的主磁体，用于在主场内产生梯度场的多个梯度线圈，用于将RF信号发送到检查区域中的激励磁共振的RF发射线圈 根据多个成像参数设置在其中，所发送的RF信号具有与其相关联的SAR，以及SAR处理器，用于将发射的RF信号保持在规定的SAR水平以下。

公开(公告)号：US20070222449A1

公开(公告)日：2007-09-27

申请号：US10589136

申请日：2005-02-24

申请人： David Hoult

发明人： David Hoult

IPC分类号： G01V3/00

CPC分类号： G01R33/583 ,  G01R33/3415 ,  G01R33/365

摘要： In nuclear magnetic resonance experiments, Cartesian electronic feedback is used to reduce substantially in transmission and/or reception the deleterious effects of sample-mediated and direct interactions between coils in an array of transmitting and/or receiving coils. The feedback is also used with single or multiple coils to maintain at essentially constant values the relationship between an input transmitter voltage and the magnetic resonance flip angle, and the relationship between transverse nuclear magnetisation and the strength of the free induction decay signal presented by a receiver for analysis, regardless of factors such as sample electrical conductivity.

摘要翻译： 在核磁共振实验中，笛卡尔电子反馈被用于在传输和/或接收线圈阵列中基本上减少传输和/或接收样品介导和线圈间的直接相互作用的有害影响。 反馈也用于单个或多个线圈以将输入发射机电压和磁共振翻转角之间的关系维持在基本恒定的值，以及横向核磁化与由接收机呈现的自由感应衰减信号的强度之间的关系 用于分析，无论诸如样品电导率等因素。

公开(公告)号：US06867591B2

公开(公告)日：2005-03-15

申请号：US10741610

申请日：2003-12-19

申请人： Ian Nelson

发明人： Ian Nelson

IPC分类号： G01R33/28 ,  G01R33/58 ,  G01V3/00

CPC分类号： G01R33/583 ,  G01R33/281

摘要： A device for simulating a sample of gas having a specific level of polarization when measured by a NMR pickup coil includes an active circuit loosely coupled to the NMR pickup coil. The active circuit responds as a hyperpolarized gas having the specific level of polarization when measured by the NMR pickup coil.

摘要翻译： 一种用于模拟具有特定极化水平的气体样本的装置，其通过NMR拾取线圈测量时包括松散耦合到NMR拾取线圈的有源电路。 当由NMR拾取线圈测量时，有源电路作为具有特定极化水平的超极化气体作出响应。

公开(公告)号：US06759847B2

公开(公告)日：2004-07-06

申请号：US10269728

申请日：2002-10-11

申请人： Gerhard Brinker ,  Wolfgang Renz

发明人： Gerhard Brinker ,  Wolfgang Renz

IPC分类号： G01V300

CPC分类号： G01R33/583 ,  A61B5/0555 ,  G06F19/00

摘要： In a method for magnetic resonance imaging with adherence to SAR limit values, a patient is charged with a radio-frequency pulse sequence via at least one transmission antenna for the implementation of a measurement in a magnetic resonance tomography apparatus, and the magnetic resonance signals that are produced are acquired in a spatially resolved manner via at least one reception antenna and are further-processed for producing magnetic resonance images or spectra. SAR values are determined before the implementation of the measurement on the basis of patient data and the position of the patient relative to the transmission antenna for planned parameters of the measurement, and the parameters are modified as needed until the SAR values lie within the SAR limit values. The position of the patient relative to the transmission antenna is exactly determined by an imaging magnetic resonance pre-measurement. The method enables adherence to the SAR limit values without having to take large tolerances into consideration. No additional hardware whatsoever and no positioning rule for the user are required for the realization of the method.

摘要翻译： 在一种遵循SAR极限值的磁共振成像方法中，患者通过至少一个发射天线对射频脉冲序列进行充电，用于在磁共振断层摄影装置中执行测量，并且磁共振信号 通过至少一个接收天线以空间分辨的方式获取，并进一步处理以产生磁共振图像或光谱。 在实施测量之前，根据患者数据和患者相对于测量的计划参数的发射天线的位置来确定SAR值，并且根据需要修改参数，直到SAR值在SAR极限内 价值观。 患者相对于发射天线的位置由成像磁共振预测精确地确定。 该方法使得能够遵守SAR限制值，而不必考虑大容差。 实现该方法不需要额外的硬件和用户的定位规则。

公开(公告)号：US20020149365A1

公开(公告)日：2002-10-17

申请号：US09833003

申请日：2001-04-11

申请人： MARCONI MEDICAL SYSTEMS, INC.

发明人： Gordon D. DeMeester ,  Michael Burl ,  Michael A. Morich

IPC分类号： G01V003/00

CPC分类号： G01R33/583

摘要： A pair of quadrature radio frequency coils (32, 34) disposed adjacent an imaging region (10) are typically loaded differently due to factors such as subject geometry, subject mass, and a relative distance from the subject. A tip angle adjustment circuit (50) monitors a combined tip angle adjacent a mid-plane of the examination region, such as by analyzing delivered and reflected power to each of the coils. An adjustment circuit (54) adjusts relative RF power or amplitude to produce a selected, combined tip angle in the examination region.

摘要翻译： 与成像区域（10）相邻设置的一对正交射频线圈（32,34）通常由于诸如被摄体几何形状，被摄体质量以及与被摄体的相对距离等因素而不同地加载。 尖端角度调节电路（50）例如通过分析每个线圈的传送和反射功率来监视与检查区域的中间平面相邻的组合尖端角度。 调整电路（54）调整相对RF功率或振幅以在检查区域中产生选定的组合尖端角度。