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1.发明申请公开(公告)号：US20160313434A1
公开(公告)日：2016-10-27
申请号：US14903636
申请日：2015-04-27
IPC分类号： G01R33/565 , G01R33/48
CPC分类号： G01R33/56572 , G01R33/385 , G01R33/4818 , G01R33/4822
摘要： A method of correcting warping of an acquired image in an MRI system, caused by non-linearities in gradient field profiles of gradient coils is set forth, comprising a) constructing a computer model representing conducting pathways for each gradient coil in said MRI system; b) calculating a predicted magnetic field at each point in space for each said gradient coil in said model; c) measuring actual magnetic field at each point in space for each said gradient coil in said MRI system; d) verifying accuracy of said model by comparing said predicted magnetic field to said actual magnetic field at each said point in space and in the event said model is not accurate then repeating a)-d), and in the event said model is accurate then; constructing a distortion map for mapping coordinates in real space to coordinates in warped space of said acquired image based on deviations of said predicted magnetic field from linearity; and unwarping said warping of the acquired image using said distortion map.
摘要翻译： 提出了一种校正由梯度线圈的梯度场分布中的非线性引起的MRI系统中的获取图像的翘曲的方法，包括：a）构建表示所述MRI系统中每个梯度线圈的导电路径的计算机模型; b）在所述模型中计算每个所述梯度线圈的每个空间点处的预测磁场; c）测量所述MRI系统中每个所述梯度线圈的每个空间点处的实际磁场; d）通过将所述预测磁场与空间中的每个所述点处的所述实际磁场进行比较并且在所述模型不准确然后重复a）-d）的情况下验证所述模型的精度，并且在所述模型是准确的情况下 ; 构建用于将所述获取图像的扭曲空间中的实空间中的坐标映射到所述预测磁场的偏离线性的坐标的失真图; 并且使用所述失真图来不理想所获取的图像的所述翘曲。
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2.发明授权公开(公告)号：US09529068B2
公开(公告)日：2016-12-27
申请号：US14903636
申请日：2015-04-27
IPC分类号： G01R33/565 , G01R33/48
CPC分类号： G01R33/56572 , G01R33/385 , G01R33/4818 , G01R33/4822
摘要： A method of correcting warping of an acquired image in an MRI system, caused by non-linearities in gradient field profiles of gradient coils is set forth, comprising a) constructing a computer model representing conducting pathways for each gradient coil in said MRI system; b) calculating a predicted magnetic field at each point in space for each said gradient coil in said model; c) measuring actual magnetic field at each point in space for each said gradient coil in said MRI system; d) verifying accuracy of said model by comparing said predicted magnetic field to said actual magnetic field at each said point in space and in the event said model is not accurate then repeating a)-d), and in the event said model is accurate then; constructing a distortion map for mapping coordinates in real space to coordinates in warped space of said acquired image based on deviations of said predicted magnetic field from linearity; and unwarping said warping of the acquired image using said distortion map.
摘要翻译： 提出了一种校正由梯度线圈的梯度场分布中的非线性引起的MRI系统中的获取图像的翘曲的方法，包括：a）构建表示所述MRI系统中每个梯度线圈的导电路径的计算机模型; b）在所述模型中计算每个所述梯度线圈的每个空间点处的预测磁场; c）测量所述MRI系统中每个所述梯度线圈的每个空间点处的实际磁场; d）通过将所述预测磁场与空间中的每个所述点处的所述实际磁场进行比较并且在所述模型不准确然后重复a）-d）的情况下验证所述模型的精度，并且在所述模型是准确的情况下 ; 构建用于将所述获取图像的扭曲空间中的实空间中的坐标映射到所述预测磁场的偏离线性的坐标的失真图; 并且使用所述失真图来不理想所获取的图像的所述翘曲。
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公开(公告)号：US09696392B2
公开(公告)日：2017-07-04
申请号：US14774501
申请日：2014-03-14
IPC分类号： G01R33/34 , G01R33/565 , G01R33/341 , G01R33/385 , G01R33/48 , G01R33/54 , G01R33/56
CPC分类号： G01R33/34046 , G01R33/34007 , G01R33/34084 , G01R33/341 , G01R33/3415 , G01R33/365 , G01R33/385 , G01R33/4818 , G01R33/482 , G01R33/546 , G01R33/5608 , G01R33/565
摘要： A method of data acquisition at a magnetic resonance imaging (MRI) system is provided. The system receives at least a portion of raw data for an image, and detects anomalies in the portion of raw data received. When anomalies are detected, the system can correct those anomalies dynamically, without waiting for a new scan to be ordered. The system can attempt to scan the offending portion of the raw data, either upon detection of the anomaly or at some point during the scan. The system can also correct anomalies using digital correction methods based on expected values. The anomalies can be detected based on variations from thresholds, masks and expected values all of which can be obtained using one of the ongoing scan, previously performed scans and apriori information relating to the type of scan being performed.
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4.发明申请公开(公告)号：US20170067979A1
公开(公告)日：2017-03-09
申请号：US15354287
申请日：2016-11-17
IPC分类号： G01R33/565 , G01R33/385 , G01R33/48
CPC分类号： G01R33/56572 , G01R33/385 , G01R33/4818 , G01R33/4822
摘要： A method of correcting warping of an acquired image in an MRI system, caused by non-linearities in gradient field profiles of gradient coils is set forth, comprising a) constructing a computer model representing conducting pathways for each gradient coil in said MRI system; b) calculating a predicted magnetic field at each point in space for each said gradient coil in said model; c) measuring actual magnetic field at each point in space for each said gradient coil in said MRI system; d) verifying accuracy of said model by comparing said predicted magnetic field to said actual magnetic field at each said point in space and in the event said model is not accurate then repeating a)-d), and in the event said model is accurate then; constructing a distortion map for mapping coordinates in real space to coordinates in warped space of said acquired image based on deviations of said predicted magnetic field from linearity; and unwarping said warping of the acquired image using said distortion map.
摘要翻译： 提出了一种校正由梯度线圈的梯度场分布中的非线性引起的MRI系统中的获取图像的翘曲的方法，包括：a）构建表示所述MRI系统中每个梯度线圈的导电路径的计算机模型; b）在所述模型中计算每个所述梯度线圈的每个空间点处的预测磁场; c）测量所述MRI系统中每个所述梯度线圈的每个空间点处的实际磁场; d）通过将所述预测磁场与空间中的每个所述点处的所述实际磁场进行比较并且在所述模型不准确然后重复a）-d）的情况下验证所述模型的精度，并且在所述模型是准确的情况下 ; 构建用于将所述获取图像的扭曲空间中的实空间中的坐标映射到所述预测磁场的偏离线性的坐标的失真图; 并且使用所述失真图来不理想所获取的图像的所述翘曲。
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公开(公告)号：US09797968B2
公开(公告)日：2017-10-24
申请号：US15321818
申请日：2014-09-15
CPC分类号： G01R33/4625 , A61B5/055 , G01R33/3621 , G01R33/4608 , G01R33/4616 , G01R33/54 , G01R33/565 , H03M1/183
摘要： A method of data acquisition at a magnetic resonance imaging (MRI) system is provided. The system receives at least a portion of raw data for an image, and detects anomalies in the portion of raw data received. When anomalies are detected, the system can correct those anomalies dynamically, without waiting for a new scan to be ordered. The system can attempt to scan the offending portion of the raw data, either upon detection of the anomaly or at some point during the scan. The system can also correct anomalies using digital correction methods based on expected values. The anomalies can be detected based on variations from thresholds, masks and expected values all of which can be obtained using one of the ongoing scan, previously performed scans and apriori information relating to the type of scan being performed.
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公开(公告)号：US09523751B2
公开(公告)日：2016-12-20
申请号：US14898545
申请日：2015-04-27
IPC分类号： G01V3/00 , G01R33/54 , H01F7/06 , G01R33/483 , G01R33/36
CPC分类号： G01R33/381 , G01R33/3664 , G01R33/385 , G01R33/3875 , G01R33/4833 , G01R33/543 , H01F7/064
摘要： A method of configuring a conducting grid of elements interconnected at intersecting nodes by switches is described. The method includes: constructing a background grid by connection of centroids of the cell shape of the conducting grid; identifying a subset of elements in the background grid that intersect the smooth pattern of loops; identifying a subset of elements in the conducting grid that intersect the subset of elements in the background grid; the subset of elements in the conducting grid forming a discretized pattern of loops representing the smooth pattern of loops; for each of the discretized pattern of loops identifying current-in and current-out nodes; altering the on-off state of individual switches in accordance with the discretized pattern of loops; opening the switch between each respective pair of current-in and current out nodes; and applying power to the conducting grid via at least one pair of the input and output current nodes such that the current flow through the elements generates the magnetic field profile.
摘要翻译： 描述了通过交换机在交叉节点处互连的元件的导电栅格的配置方法。 该方法包括：通过连接导电栅格的单元格形状的质心来构建背景网格; 识别背景网格中与循环平滑模式相交的元素的子集; 识别导电网格中与背景网格中的元素子集相交的元素的子集; 导电栅格中的元素的子集形成表示环的平滑图案的环的离散模式; 对于每个离散的模式的环路识别电流输入和电流输出节点; 根据循环的离散模式改变各个开关的开关状态; 在每个相应的一对电流输入和当前输出节点之间打开开关; 以及经由至少一对所述输入和输出电流节点向所述导电栅格施加电力，使得通过所述元件的电流产生所述磁场分布。
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公开(公告)号：US09989615B2
公开(公告)日：2018-06-05
申请号：US15354287
申请日：2016-11-17
IPC分类号： G01R33/565 , G01R33/385 , G01R33/48
CPC分类号： G01R33/56572 , G01R33/385 , G01R33/4818 , G01R33/4822
摘要： A method of correcting warping of an acquired image in an MRI system, caused by non-linearities in gradient field profiles of gradient coils is set forth, comprising a) constructing a computer model representing conducting pathways for each gradient coil in said MRI system; b) calculating a predicted magnetic field at each point in space for each said gradient coil in said model; c) measuring actual magnetic field at each point in space for each said gradient coil in said MRI system; d) verifying accuracy of said model by comparing said predicted magnetic field to said actual magnetic field at each said point in space and in the event said model is not accurate then repeating a)-d), and in the event said model is accurate then; constructing a distortion map for mapping coordinates in real space to coordinates in warped space of said acquired image based on deviations of said predicted magnetic field from linearity; and unwarping said warping of the acquired image using said distortion map.
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8.发明申请公开(公告)号：US20170067975A1
公开(公告)日：2017-03-09
申请号：US15351604
申请日：2016-11-15
IPC分类号： G01R33/381 , G01R33/3875 , G01R33/385
CPC分类号： G01R33/381 , G01R33/3664 , G01R33/385 , G01R33/3875 , G01R33/4833 , G01R33/543 , H01F7/064
摘要： A method of configuring a conducting grid of elements interconnected at intersecting nodes by switches is described. The method includes: constructing a background grid by connection of centroids of the cell shape of the conducting grid; identifying a subset of elements in the background grid that intersect the smooth pattern of loops; identifying a subset of elements in the conducting grid that intersect the subset of elements in the background grid; the subset of elements in the conducting grid forming a discretized pattern of loops representing the smooth pattern of loops; for each of the discretized pattern of loops identifying current-in and current-out nodes; altering the on-off state of individual switches in accordance with the discretized pattern of loops; opening the switch between each respective pair of current-in and current out nodes; and applying power to the conducting grid via at least one pair of the input and output current nodes such that the current flow through the elements generates the magnetic field profile.
摘要翻译： 描述了通过交换机在交叉节点处互连的元件的导电栅格的配置方法。 该方法包括：通过连接导电栅格的单元格形状的质心来构建背景网格; 识别背景网格中与循环平滑模式相交的元素的子集; 识别导电网格中与背景网格中的元素子集相交的元素的子集; 导电栅格中的元素的子集形成表示环的平滑图案的环的离散模式; 对于每个离散的模式的环路识别电流输入和电流输出节点; 根据循环的离散模式改变各个开关的开关状态; 在每个相应的一对电流输入和当前输出节点之间打开开关; 以及经由至少一对所述输入和输出电流节点向所述导电栅格施加电力，使得通过所述元件的电流产生所述磁场分布。
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公开(公告)号：US10185005B2
公开(公告)日：2019-01-22
申请号：US15546706
申请日：2015-02-23
申请人： Geron Andre Bindseil , Chad Tyler Harris , William Bradfield Handler , Blaine Alexander Chronik
发明人： Geron Andre Bindseil , Chad Tyler Harris , William Bradfield Handler , Blaine Alexander Chronik
IPC分类号： G01R33/385 , G01R33/38 , G01R33/381 , G01R33/44 , G01R33/421
摘要： A magnetic resonance imaging (MRI) system is provided. The system includes a main field magnet generating a main magnetic field B0. Moreover, the system further includes an integrated magnet device. The integrated magnet device has field-shift coils including primary field-shift coils and field-shift shield coils, the primary field shift coils being placed closer to an object to be imaged within the imaging volume than the field-shift shield coils. The gradient coils are placed between the primary field-shift coils and field-shift shield coils. At least one substrate layer is included to provide mechanical support for the field-shift coils and the gradient coils.
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公开(公告)号：US20160178718A1
公开(公告)日：2016-06-23
申请号：US14894212
申请日：2014-12-09
申请人： Geron André Bindseil , Chad Tyler Harris , William Bradfield Handler , Blaine Alexander Chronik
发明人： Geron André Bindseil , Chad Tyler Harris , William Bradfield Handler , Blaine Alexander Chronik
IPC分类号： G01R33/385 , H01F41/04
CPC分类号： H01F41/04 , G01R33/385 , G01R33/3854
摘要： A method of manufacturing electromagnet coils for use in a magnetic resonance imaging (MRI) system is provided. The method comprises forming a coil representation of a coil surface for the electromagnet coils; setting a plurality of performance metric requirements for a plurality of performance metrics for the electromagnet coils, the plurality of performance metrics including a magnetic field-shape metric and an eddy-field metric; forming a performance functional, based on the coil representation and the plurality of performance metrics, for generating a current density pattern over the coil surface; optimizing the performance functional based on the plurality of performance so metric requirements; generating a current density pattern over the coil surface based on the minimized performance functional; and obtaining coil windings from the current density pattern.
摘要翻译： 提供一种制造用于磁共振成像（MRI）系统的电磁线圈的方法。 该方法包括形成用于电磁线圈的线圈表面的线圈表示; 为所述电磁线圈的多个性能度量设置多个性能度量要求，所述多个性能度量包括磁场形状量度和涡流量度; 基于线圈表示和多个性能度量来形成用于在线圈表面上产生电流密度模式的性能功能; 根据公认要求的多个性能优化性能功能; 基于最小化的性能功能，在线圈表面上产生电流密度模式; 并从电流密度模式获得线圈绕组。
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