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公开(公告)号：US07652474B2
公开(公告)日：2010-01-26
申请号：US12151025
申请日：2008-05-02
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： Example systems, methods, and apparatus associated with conjugate symmetry in parallel imaging are provided. One example method includes controlling a parallel magnetic resonance imaging (pMRI) apparatus to acquire a first magnetic resonance (MR) signal from a first point in k-space using a phased array of receiving coils. The method also includes identifying a second point in k-space that is related to the first point by a conjugate symmetry relation. The relation may be, for example, a reflection, a rotation, and so on. The method also includes determining a second MR signal associated with the second point based, at least in part, on the first MR signal and the conjugate symmetry relation and then reconstructing an MR image based, at least in part, on both the first MR signal and the second MR signal.
摘要翻译： 提供了与并行成像中共轭对称性相关联的示例系统，方法和设备。 一个示例性方法包括控制并联磁共振成像（pMRI）装置，以使用接收线圈的相控阵列从k空间中的第一点获取第一磁共振（MR）信号。 该方法还包括通过共轭对称关系识别与第一点相关的k空间中的第二点。 该关系可以是例如反射，旋转等。 该方法还包括至少部分地基于第一MR信号和共轭对称关系确定与第二点相关联的第二MR信号，并且然后至少部分地基于第一MR信号和共轭对称关系重建MR图像 和第二MR信号。
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公开(公告)号：US07606612B2
公开(公告)日：2009-10-20
申请号：US11132989
申请日：2005-05-19
CPC分类号： A61B5/055
摘要： A system and method to perform parallel MR imaging are disclosed. The system comprises an MR imaging machine and a probe having at least two MR RF reception coils. Each coil of the probe is operationally connected to a separate receiver channel of the MR imaging machine. The MR imaging machine implements a partially parallel acquisition method to excite precessing nuclear spins, in and around an internal segment of a patient into which the probe is inserted, and to use the coils of the catheter to simultaneously sample a plurality of response signals to form reduced k-space data sets for each of the coils. The plurality of response signals represent nuclear magnetic resonance signals arising from the precessing nuclear spins. The reduced k-space data sets are further processed by the MR imaging machine to generate a full volume dataset of a region in and around the vessel.
摘要翻译： 公开了一种执行并行MR成像的系统和方法。 该系统包括MR成像机和具有至少两个MR RF接收线圈的探针。 探针的每个线圈可操作地连接到MR成像机的单独接收器通道。 MR成像机实现部分平行采集方法，以便在插入探头的患者的内部段内和周围激发进动的核自旋，并且使用导管的线圈同时采样多个响应信号以形成 减少每个线圈的k空间数据集。 多个响应信号表示从进动的核自旋产生的核磁共振信号。 缩小的k空间数据集由MR成像机进一步处理以产生血管内和周围区域的完整体积数据集。
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13.发明申请公开(公告)号：US20090092303A1
公开(公告)日：2009-04-09
申请号：US12150790
申请日：2008-05-01
IPC分类号： G06K9/00
CPC分类号： G01R33/5611 , G01R33/56308
摘要： Example methods, apparatus, and systems associated with dynamic parallel magnetic resonance imaging (DpMRI) are presented. One example system facilitates separating data associated with a dynamic portion of a dynamic magnetic resonance image from data associated with a static portion of the dynamic magnetic resonance image. The system computes reconstruction parameters for a DpMRI reconstruction processes for both the dynamic portion of the image and the static portion of the image. The example system produces a DpMRI image based on separate reconstructions of the dynamic portion of a dynamic magnetic resonance image and the static portion of a dynamic magnetic resonance image. The separate reconstructions may depend on separate sets of reconstruction parameters and on separated static data and dynamic data.
摘要翻译： 提出了与动态并联磁共振成像（DpMRI）相关的示例方法，设备和系统。 一个示例性系统有助于将与动态磁共振图像的动态部分相关联的数据与与动态磁共振图像的静态部分相关联的数据分离。 系统为图像的动态部分和图像的静态部分计算DpMRI重建过程的重建参数。 该示例系统基于动态磁共振图像的动态部分和动态磁共振图像的静态部分的单独重建产生DpMRI图像。 单独的重建可能取决于单独的重建参数集合和分离的静态数据和动态数据。
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公开(公告)号：US20080278160A1
公开(公告)日：2008-11-13
申请号：US12150839
申请日：2008-05-01
申请人： Mark A. Griswold , Martin Blaimer
发明人： Mark A. Griswold , Martin Blaimer
IPC分类号： G01R33/54
CPC分类号： G01R33/5611
摘要： Example systems, methods, and apparatus facilitate providing a k-space line that is missing in an under-sampled time frame. The missing line is computed by applying a GRAPPA-operator to a known k-space line in the under-sampled time frame. One example method includes controlling a dynamic parallel magnetic resonance imaging (DpMRI) apparatus to acquire a first under-sampled time interleaved frame having at least one first k-space line and controlling the DpMRI apparatus to acquire a second under-sampled time interleaved frame having at least one second k-space line that neighbors the first k-space line. The method includes assembling a reference data set from the first under-sampled time frame and the second under-sampled time frame and then determining the GRAPPA-operator from neighboring k-space lines in the reference data set.
摘要翻译： 示例系统，方法和装置有助于提供在欠采样时间帧内丢失的k空间线。 通过将GRAPPA运算符应用到欠采样时间帧中的已知k空间线来计算缺失线。 一个示例性方法包括控制动态并行磁共振成像（DpMRI）装置以获取具有至少一个第一k空间线的第一欠采样时间交织帧，并且控制DpMRI装置获取第二欠采样时间交织帧，其具有 与第一k空间线相邻的至少一个第二k空间线。 该方法包括从第一欠采样时间帧和第二欠采样时间帧组合参考数据集，然后从参考数据集中的相邻k空间线确定GRAPPA算子。
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公开(公告)号：US08717020B2
公开(公告)日：2014-05-06
申请号：US12603758
申请日：2009-10-22
CPC分类号： A61B5/055
摘要： Example systems, methods, and apparatus concern non-Cartesian CAIPIRINHA (Controlled Aliasing In Parallel Imaging Results IN Higher Acceleration). One example parallel magnetic resonance imaging (pMRI) apparatus includes a radio frequency (RF) manipulation logic configured to control the pMRI apparatus to perform a non-Cartesian CAIPIRINHA acquisition process in which under-sampled data is acquired using a non-Cartesian (e.g., radial) pattern. The apparatus also includes a reconstruction logic configured to reconstruct the under-sampled data as a function of phase shift applied by the non-Cartesian CAIPIRINHA acquisition process and coil sensitivities acquired during the non-Cartesian CAIPIRINHA acquisition process.
摘要翻译： 示例系统，方法和设备涉及非笛卡尔CAIPIRINHA（受控混叠并行成像在较高加速度下）。 一种示例性并行磁共振成像（pMRI）装置包括射频（RF）操纵逻辑，其被配置为控制pMRI装置执行非笛卡尔CAIPIRINHA获取过程，其中采用非笛卡尔（例如， 径向）图案。 该装置还包括重建逻辑，其被配置为根据非笛卡尔CAIPIRINHA采集过程应用的相移以及在非笛卡尔CAIPIRINHA采集过程期间获取的线圈灵敏度来重建欠采样数据。
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公开(公告)号：US08648593B2
公开(公告)日：2014-02-11
申请号：US13221999
申请日：2011-08-31
申请人： Jeffrey L. Duerk , Jeffrey L. Sunshine , Mark A. Griswold , Jamal J. Derakhshan , Sherif G. Nour
发明人： Jeffrey L. Duerk , Jeffrey L. Sunshine , Mark A. Griswold , Jamal J. Derakhshan , Sherif G. Nour
IPC分类号： G01V3/00
CPC分类号： G01R33/5613 , G01R33/5607 , G01R33/5614
摘要： Systems, methods, and other embodiments associated with controlling a magnetic resonance imaging (MRI) apparatus to perform a balanced steady state free precession (bSSFP) technique that includes magnetization preparation with differentiated velocity encoding and spoiling residual transverse magnetization are described. The example systems, methods, and other embodiments are also associated with acquiring a dark blood image in response to the bSSFP technique. A dark blood image is one in which NMR signal acquired from an object subjected to the bSSFP technique and magnetization preparation includes NMR signal from flowing spins and NMR signal from non-flowing spins in a desired ratio.
摘要翻译： 描述了与控制磁共振成像（MRI）装置执行平衡的稳态自由进动（bSSFP）技术相关联的系统，方法和其他实施例，其包括具有差分速度编码和破坏残余横向磁化的磁化准备。 示例系统，方法和其他实施例也与响应于bSSFP技术获取深色血液图像相关联。 深色血液图像是其中从经受bSSFP技术和磁化制备的物体获得的NMR信号包含来自流动自旋的NMR信号和来自非流动自旋的NMR信号以期望的比例。
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公开(公告)号：US08208986B2
公开(公告)日：2012-06-26
申请号：US12283196
申请日：2008-09-10
IPC分类号： A61B5/05
CPC分类号： G01R33/5614 , A61B5/055 , G01R33/5602 , G01R33/5607 , G01R33/56333
摘要： Systems, methods, and other embodiments associated with steady state dark blood magnetic resonance imaging MRI are described. One example method includes controlling an MRI apparatus to produce a steady state pulse sequence. The example method may also include controlling the MRI apparatus to generate radio frequency (RF) energy and magnetic gradients associated with the steady state pulse sequence. The steady state pulse sequence is different from conventional steady state pulses in that it is characterized by regularly spaced slice selection excitation pulses to excite a region to be imaged in an object to be imaged using a consistent repetition time (TR), a set of readout modules, and a set of a magnetization preparation modules. A magnetization preparation module is characterized by gradients associated with imaging not being active, gradients associated with slice selection being active, and RF pulses associated with slice selection being active.
摘要翻译： 描述与稳态暗血液磁共振成像MRI相关联的系统，方法和其它实施方案。 一个示例性方法包括控制MRI装置以产生稳态脉冲序列。 该示例性方法还可以包括控制MRI设备以产生与稳态脉冲序列相关联的射频（RF）能量和磁梯度。 稳态脉冲序列与常规稳态脉冲不同，其特征在于规则间隔的切片选择激励脉冲，以使用一致的重复时间（TR）来激发待成像物体中要被成像的区域，一组读出 模块和一组磁化准备模块。 磁化准备模块的特征在于与成像不相关的梯度，与切片选择相关的梯度是有效的，以及与切片选择相关联的RF脉冲是有效的。
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18.发明授权Dynamic pMRI using GRAPPA-operator with under-sampled time interleaved frames 有权使用具有欠采样时间交织帧的GRAPPA算子的动态pMRI公开(公告)号：US07863893B2
公开(公告)日：2011-01-04
申请号：US12150839
申请日：2008-05-01
申请人： Mark A. Griswold , Martin Blaimer
发明人： Mark A. Griswold , Martin Blaimer
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： Example systems, methods, and apparatus facilitate providing a k-space line that is missing in an under-sampled time frame. The missing line is computed by applying a GRAPPA-operator to a known k-space line in the under-sampled time frame. One example method includes controlling a dynamic parallel magnetic resonance imaging (DpMRI) apparatus to acquire a first under-sampled time interleaved frame having at least one first k-space line and controlling the DpMRI apparatus to acquire a second under-sampled time interleaved frame having at least one second k-space line that neighbors the first k-space line. The method includes assembling a reference data set from the first under-sampled time frame and the second under-sampled time frame and then determining the GRAPPA-operator from neighboring k-space lines in the reference data set.
摘要翻译： 示例系统，方法和装置有助于提供在欠采样时间帧内丢失的k空间线。 通过将GRAPPA运算符应用到欠采样时间帧中的已知k空间线来计算缺失线。 一个示例性方法包括控制动态并行磁共振成像（DpMRI）装置以获取具有至少一个第一k空间线的第一欠采样时间交织帧，并且控制DpMRI装置获取第二欠采样时间交织帧，其具有 与第一k空间线相邻的至少一个第二k空间线。 该方法包括从第一欠采样时间帧和第二欠采样时间帧组合参考数据集，然后从参考数据集中的相邻k空间线确定GRAPPA算子。
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19.发明申请DYNAMICALLY SELECTIVELY CONFIGURING WIRELESS TRANSMITTER ASSOCIATED WITH MRI DETECTOR COIL 有权与MRI检测器线圈相关的动态选择性配置无线发射器公开(公告)号：US20100253331A1
公开(公告)日：2010-10-07
申请号：US12417703
申请日：2009-04-03
CPC分类号： G01R33/3692
摘要： Systems, methods, and other embodiments associated with dynamically selectively configuring wireless transmitters associated with MRI detector coils are described. One example apparatus includes a detector coil to receive an NMR signal. The apparatus includes a dynamically configurable transmitter to transmit an RF transmission according to a configurable set of transmission parameters. The RF transmission is based on the NMR signal received by the MRI detector coil. The apparatus includes a tuning logic that cycles between an active state and a passive state under the control of a tuning program. While in the passive state, the tuning logic is to generate substantially no RF that could interfere with receiving the NMR signal at the MRI detector coil. While in the active state, the tuning logic is to configure the dynamically configurable transmitter to transmit according to the set of transmission parameters.
摘要翻译： 描述了与动态选择性地配置与MRI检测器线圈相关联的无线发射器相关联的系统，方法和其他实施例。 一个示例性装置包括用于接收NMR信号的检测器线圈。 该装置包括可动态配置的发射机，用于根据一组可配置的传输参数传输RF传输。 RF传输基于由MRI检测器线圈接收的NMR信号。 该装置包括在调谐程序的控制下在活动状态和被动状态之间循环的调谐逻辑。 在处于被动状态时，调谐逻辑是基本上不产生可能干扰在MRI检测器线圈处接收NMR信号的RF。 在处于活动状态时，调谐逻辑是配置可动态配置的发射机根据传输参数的集合进行传输。
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公开(公告)号：US07741843B2
公开(公告)日：2010-06-22
申请号：US12150848
申请日：2008-05-01
申请人： Mark A. Griswold , Martin Blaimer , Felix Breuer
发明人： Mark A. Griswold , Martin Blaimer , Felix Breuer
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： Example systems, methods, and apparatus associated with determining a phase-encoding direction for parallel MRI are described. One example, method includes selecting a set of projection directions along which an MRI apparatus is to apply RF energy to an object to be imaged. The method includes controlling the MRI apparatus to selecting a set of projection directions and to acquire MR signal from the object through a set of detectors. The method includes analyzing the MR signal to identify individual sensitivities for members of the set of detectors and selecting a phase-encoding direction for a pMRI session based on the individual sensitivities for the members. The method produces a concrete, tangible, and useful result by controlling the MRI apparatus to perform the pMRI session based on the selected phase-encoding direction.
摘要翻译： 描述了与确定并行MRI的相位编码方向相关联的示例系统，方法和装置。 一个示例性方法包括选择一组投影方向，MRI设备将沿着该方向向待成像对象施加RF能量。 该方法包括控制MRI装置选择一组投影方向，并通过一组检测器从对象获取MR信号。 该方法包括分析MR信号以识别该组检测器的成员的个体灵敏度，并且基于成员的个体灵敏度来选择pMRI会话的相位编码方向。 该方法通过控制MRI装置基于所选择的相位编码方向执行pMRI会话来产生具体的，有形的和有用的结果。
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