公开(公告)号：US20150253396A1

公开(公告)日：2015-09-10

申请号：US14201222

申请日：2014-03-07

申请人： One Resonance Sensors, LLC

发明人： Kevin Derby

IPC分类号： G01R33/36

CPC分类号： G01N24/082 ,  G01N24/08 ,  G01R33/28 ,  G01R33/3642 ,  G01R33/583

摘要： A device and system for generating a broadband excitation signal and corresponding excitation field to a substance under test in an NMR system is presented. The excitation signal is generated, according to a broadband transmitter, to a coil in the NMR system. A corresponding broadband receiver is also presented that acquires a response signal resulting from a response field emanating from the substance under test. Neither the transmitter nor the receiver require that the frequency of operation be determined according to a particular configuration of electrical devices to determine a resonance characteristic that tunes to a particular operational frequency. Rather, the operational frequency is determined according to control and driver devices triggered according to command and control signals in the case of the transmitter, and according to reactive elements, that are not configured as a tuned circuit, in the case of the receiver.

摘要翻译： 提出了一种用于在NMR系统中产生宽带激发信号和对待测物质的相应激发场的装置和系统。 根据宽带发射机产生激励信号到NMR系统中的线圈。 还提出了相应的宽带接收机，其获取由被测物质产生的响应场产生的响应信号。 发射机和接收机都不要求根据电气设备的特定配置来确定操作频率，以确定调谐到特定工作频率的谐振特性。 相反，在接收机的情况下，根据在发射机的情况下根据命令和控制信号触发的控制和驱动器设备以及未被配置为调谐电路的无功元件来确定操作频率。

公开(公告)号：US20140347052A1

公开(公告)日：2014-11-27

申请号：US14453004

申请日：2014-08-06

申请人： KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MEDICAL SYSTEMS CORPORATION

发明人： Mitsukazu KAMATA ,  Masaaki UMEDA

IPC分类号： G01R33/565

CPC分类号： G01R33/5659 ,  G01R33/56518 ,  G01R33/56563 ,  G01R33/56572 ,  G01R33/583

摘要： According to one embodiment, a magnetic resonance imaging apparatus includes a phase image generating unit, an image value acquisition unit and a frequency shift calculation unit. The phase image generating unit executes a sequence including an application of a bipolar gradient pulse and thereby generates a first phase image. The image value acquisition unit acquires an image value of the first phase image. The frequency shift calculation unit determines an amount of frequency shift per unit amount of gradient magnetic field based on magnetic field strength of the bipolar gradient pulse and on the image value of the first phase image.

摘要翻译： 根据一个实施例，磁共振成像装置包括相位图像生成单元，图像值获取单元和频率偏移计算单元。 相位图像生成单元执行包括应用双极性梯度脉冲的序列，从而生成第一相位图像。 图像值获取单元获取第一相位图像的图像值。 频移计算单元基于双极性梯度脉冲的磁场强度和第一相位图像的图像值来确定每单位量的梯度磁场的频移量。

公开(公告)号：US08847593B2

公开(公告)日：2014-09-30

申请号：US13257317

申请日：2010-03-22

申请人： Peter Boernert ,  Kay Nehrke

发明人： Peter Boernert ,  Kay Nehrke

IPC分类号： G01V3/00

CPC分类号： G01R33/5612 ,  G01R33/246 ,  G01R33/5659 ,  G01R33/583 ,  G01R33/586

摘要： A method comprises: performing a number of B i field mapping sequences (24) using a set of radio frequency transmit coils (11) to acquire a B1 field mapping data set wherein said number is less than a number of radio frequency transmit coils in the set of radio frequency transmit coils; and determining coil sensitivities (30) for the set of radio frequency transmit coils based on the acquired B1 field mapping data set. In some embodiments, the performed B1 field mapping sequences are defined by (i) performing a linear transform (40) on the set of radio frequency transmit coils to generate a set of orthogonal virtual radio frequency transmit coils (42) and (ii) selecting (44) a sub-set (46) of the set of orthogonal virtual radio frequency transmit coils that define the performed B1 field mapping sequences.

摘要翻译： 一种方法包括：使用一组射频发射线圈（11）来执行多个B i场映射序列（24），以获取B1场映射数据集，其中所述数小于所述射频发射线圈的数量 射频发射线圈组; 以及基于所获取的B1场映射数据集来确定所述一组射频发射线圈的线圈灵敏度（30）。 在一些实施例中，所执行的B1场映射序列由（i）在射频发射线圈组上执行线性变换（40）来定义，以产生一组正交虚拟射频发射线圈（42）和（ii）选择 （44）定义所执行的B1场映射序列的所述一组正交虚拟射频发射线圈的子集（46）。

公开(公告)号：US08829903B2

公开(公告)日：2014-09-09

申请号：US13315388

申请日：2011-12-09

申请人： Bijay Kamleshbhai Shah ,  Eddy Benjamin Boskamp ,  Ricardo Becerra

发明人： Bijay Kamleshbhai Shah ,  Eddy Benjamin Boskamp ,  Ricardo Becerra

IPC分类号： G01V3/00

CPC分类号： G01R33/583 ,  G01R33/34076 ,  G01R33/3678

摘要： An MRI apparatus includes a magnetic resonance imaging (MRI) system having a plurality of gradient coils positioned about a bore of a magnet, an RF coil assembly having at least a first port and a second port, an RF transceiver system having a pulse module and configured to transmit RF signals to the first port and the second port, and a computer programmed to drive the RF coil assembly in quadrature through the at least first port and the second port, measure a B1 field using at least one flux probe at two or more angular orientations within the RF coil assembly, and characterize and optimize performance of the MRI system based on the measurements of the B1 field.

摘要翻译： MRI装置包括磁共振成像（MRI）系统，其具有围绕磁体的孔定位的多个梯度线圈，具有至少第一端口和第二端口的RF线圈组件，具有脉冲模块的RF收发器系统和 被配置为将RF信号发射到第一端口和第二端口，以及被编程为通过至少第一端口和第二端口正交地驱动RF线圈组件的计算机，使用至少一个通量探针在两个或两个 RF线圈组件内的更多角度取向，并且基于B1场的测量来表征和优化MRI系统的性能。

公开(公告)号：US08816688B2

公开(公告)日：2014-08-26

申请号：US13214348

申请日：2011-08-22

申请人： Kohei Adachi ,  Masatoshi Hanawa ,  Kazuya Okamoto

发明人： Kohei Adachi ,  Masatoshi Hanawa ,  Kazuya Okamoto

IPC分类号： G01V3/00

CPC分类号： G01R33/583 ,  G01R33/5659

摘要： A magnetic resonance imaging apparatus includes an imaging condition acquisition unit and an imaging unit. The imaging condition acquisition unit acquires at least one of optimum amplitude and optimum phase of a radio frequency transmission signal so as to reduce a deviation of data in at least one region of interest set in an object. The imaging unit acquires image data by imaging according to an imaging condition including at least one of optimum amplitude and optimum phase.

摘要翻译： 磁共振成像装置包括成像条件获取单元和成像单元。 成像条件获取单元获取射频发送信号的最佳幅度和最佳相位中的至少一个，以便减少在对象中设置的至少一个感兴趣区域中的数据的偏差。 成像单元根据包括最佳幅度和最佳相位中的至少一个的成像条件进行成像来获取图像数据。

公开(公告)号：US20140077805A1

公开(公告)日：2014-03-20

申请号：US14116228

申请日：2012-05-23

申请人： Yusuke Hoshino ,  Akiko Kanet ,  Shinji Kurokawa

发明人： Yusuke Hoshino ,  Akiko Kanet ,  Shinji Kurokawa

IPC分类号： G01R33/56

CPC分类号： G01R33/56 ,  G01R33/5617 ,  G01R33/583

摘要： The purpose of the present invention is to obtain an image with a desired contrast while minimizing specific absorption rate and without deteriorating image quality in a variable refocus flip angle sequence. To this end, Teequiv specified by a signal decay pattern SSP obtained by a flip angle changing pattern FAP is compared with a designated Teequiv, and the flip angle changing pattern FAP is changed according to the comparison result to search for the flip angle changing pattern FAP which gives a desired contrast. Then, the flip angle changing pattern FAP which is capable of realizing the designated Teequiv is determined. Then, imaging is performed using each flip angle constitutes the determined flip angle changing pattern FAP.

摘要翻译： 本发明的目的是获得具有期望对比度的图像，同时使比吸收率最小化并且不会使可变重聚焦翻转序列中的图像质量恶化。 为此，将通过翻转角度改变图案FAP获得的信号衰减图案SSP指定的Teequiv与指定的Teequiv进行比较，并且根据比较结果改变翻转角度改变图案FAP，以搜索翻转角度改变图案FAP 这给出了所需的对比度。 然后，确定能够实现指定的Teequiv的翻转角变化模式FAP。 然后，使用每个翻转角构成确定的翻转角改变图案FAP来执行成像。

公开(公告)号：US20140035579A1

公开(公告)日：2014-02-06

申请号：US13956576

申请日：2013-08-01

申请人： Dominik Paul

发明人： Dominik Paul

IPC分类号： G01R33/58

CPC分类号： G01R33/583 ,  G01R33/561 ,  G01R33/5617

摘要： In a method and magnetic resonance system for the acquisition of magnetic resonance data in a selected region of an examination subject, magnetic resonance data are acquired more than once using a magnetic resonance system, magnetic resonance data are acquired more than once from a selected partial region the portion of k-space filled with data corresponding to the selected region of the subject, and the multiply acquired magnetic resonance data are processed into a data set, the aforementioned partial region is selected so as to be located decentrally in k-space, meaning that it is asymmetrical relative to the center of k-space.

摘要翻译： 在用于在检查对象的选定区域中获取磁共振数据的方法和磁共振系统中，使用磁共振系统获得不止一次的磁共振数据，从选定的部分区域获取多于一次的磁共振数据 填充有与被检体的选定区域对应的数据的k空间的部分和乘法获取的磁共振数据被处理为数据组，上述部分区域被选择为在k空间中分散定位，意思是 它相对于k空间的中心是不对称的。

公开(公告)号：US08581585B2

公开(公告)日：2013-11-12

申请号：US12864789

申请日：2009-02-02

申请人： Koichi Arai

发明人： Koichi Arai

IPC分类号： G01V3/00

CPC分类号： G01R33/583 ,  G01R33/543 ,  G01R33/546

摘要： This aims to shorten the time period, which is required for optimizing a radio-frequency magnetic field pulse intensity, thereby to shorten the measurement time period of an MRI entirety.In the operation for optimizing the radio-frequency magnetic field pulse intensity, an initial state for applying radio-frequency magnetic field pulses is intentionally created for a short time period, thereby to shorten the radio-frequency magnetic field pulse interval for the repeated applications.The radio-frequency magnetic field pulses are repeatedly applied at a predetermined time interval sufficiently shorter than the relaxing time period of the radio-frequency magnetic field pulses, and the state in which the magnetic resonance signal intensity becomes a threshold value or less is set to an initial state.

摘要翻译： 这旨在缩短优化射频磁场脉冲强度所需的时间段，从而缩短MRI整体的测量时间周期。 在用于优化射频磁场脉冲强度的操作中，有意地在短时间内创建用于施加射频磁场脉冲的初始状态，从而缩短重复应用的射频磁场脉冲间隔。 以与射频磁场脉冲的放松时间相比足够短的预定时间间隔重复施加射频磁场脉冲，将磁共振信号强度变为阈值以下的状态设定为 初始状态。

公开(公告)号：US20130249554A1

公开(公告)日：2013-09-26

申请号：US13990089

申请日：2011-11-28

申请人： Arjan Willem Simonetti ,  Henri Gwenael Herigault

发明人： Arjan Willem Simonetti ,  Henri Gwenael Herigault

IPC分类号： G01R33/58

CPC分类号： G01R33/583 ,  G01R33/4828 ,  G01R33/5607 ,  G01R33/56527

摘要： The invention relates to a method of MR imaging of at least a portion of a body (10) of a patient positioned in an examination volume of a MR device (1). It is an object of the invention to provide a method that enables improved fat saturation. The method of the invention comprises the steps of: subjecting the portion of the body (10) to a calibration sequence comprising RF pulses and switched magnetic field gradients controlled in such a manner that a calibration signal data set is acquired by means of a multi-point Dixon technique at a first image resolution; deriving calibration parameters from the calibration signal data set; subjecting the portion of the body (10) to an imaging sequence comprising RF pulses and switched magnetic field gradients controlled in such a manner that a diagnostic signal data set is acquired at a second image resolution which is higher than the first image resolution; and reconstructing a diagnostic MR image from the diagnostic signal data set, wherein the MR device (1) is operated according to the derived calibration parameters during acquisition of the diagnostic signal data set and/or during reconstruction of the diagnostic MR image. Moreover, the invention relates to a MR device (1) for carrying out the method and to a computer program to be run on a MR device (1).

摘要翻译： 本发明涉及一种定位在MR装置（1）的检查体积中的患者的身体（10）的至少一部分的MR成像方法。 本发明的目的是提供一种能够改善脂肪饱和度的方法。 本发明的方法包括以下步骤：使身体（10）的一部分经受包括RF脉冲和切换磁场梯度的校准序列，该校正序列以如下方式进行控制：校准信号数据集通过多 点Dixon技术在第一个图像分辨率; 从校准信号数据集导出校准参数; 使所述身体（10）的所述部分经受包括RF脉冲和切换磁场梯度的成像序列，所述成像序列以使得以比所述第一图像分辨率高的第二图像分辨率获取诊断信号数据集的方式被控制; 以及从所述诊断信号数据集重构诊断MR图像，其中在所述诊断信号数据集的获取期间和/或在所述诊断MR图像的重建期间，所述MR装置（1）根据所导出的校准参数进行操作。 此外，本发明涉及一种用于执行该方法的MR设备（1）和一个在MR设备（1）上运行的计算机程序。

公开(公告)号：US20130187651A1

公开(公告)日：2013-07-25

申请号：US13731349

申请日：2012-12-31

申请人： KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA MEDICAL SYSTEMS CORPORATION

发明人： Hidetaka KONTA ,  Kiyomi OOSHIMA ,  Masashi OOKAWA

IPC分类号： G01R33/565 ,  G01R33/58

CPC分类号： G01R33/565 ,  G01R33/543 ,  G01R33/5611 ,  G01R33/56383 ,  G01R33/583

摘要： In one embodiment, an MRI apparatus (20) includes a reference scan setting unit (100), a reference scan execution unit, and an image generation unit. The reference scan setting unit calculates a signal acquisition region of “a reference scan in which MR signals used for generation of a sensitivity distribution map of each coil element are acquired”, depending on an imaging region of a main scan of parallel imaging. The reference scan execution unit executes the reference scan on the calculated signal acquisition region. The image generation unit generates image data according to “MR signals acquired by the main scan” and “the sensitivity distribution map generated based on MR signals acquired by the reference scan”.

摘要翻译： 在一个实施例中，MRI装置（20）包括参考扫描设置单元（100），参考扫描执行单元和图像生成单元。 参考扫描设置单元根据并行成像的主扫描的成像区域，计算“采集用于生成每个线圈元件的灵敏度分布图的MR信号的参考扫描”的信号获取区域。 参考扫描执行单元对所计算的信号获取区域执行基准扫描。 图像生成单元根据“通过主扫描获取的MR信号”和“基于通过基准扫描获取的MR信号生成的灵敏度分布图”来生成图像数据。