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公开(公告)号：US20100013478A1
公开(公告)日：2010-01-21
申请号：US12439104
申请日：2007-09-28
IPC分类号： G01R33/48
CPC分类号： G01R33/4828 , G01R33/5607
摘要： A magnetic resonance imaging device includes magnetic field generating means and control means for controlling receiving means according to a predetermined pulse sequence, the predetermined pulse sequence including an unnecessary material suppressing sequence unit for canceling a signal from an unnecessary material which is not a measurement target and a main imaging sequence unit for measuring a nuclear magnetic resonance signal used to create an image of an examinee. The unnecessary material suppressing sequence unit generates at least two or more high frequency magnetic field pulses so that the longitudinal magnetization of the unnecessary material is made spatially uniform in the imaging space under application of a first high frequency magnetic field pulse in the main imaging sequence unit. The magnetic resonance imaging device further includes adjusting means for adjusting the flip angles of the two or more high frequency magnetic field pulses, and the control means applies the two or more high frequency magnetic field pulses at the flip angles adjusted by the adjusting means.
摘要翻译： 磁共振成像装置包括磁场产生装置和用于根据预定脉冲序列控制接收装置的控制装置，所述预定脉冲序列包括用于从不是测量目标的不必要材料消除信号的不必要材料抑制序列单元，以及 用于测量用于创建受检者的图像的核磁共振信号的主要成像序列单元。 不需要的材料抑制序列单元产生至少两个或更多个高频磁场脉冲，使得在主成像序列单元中施加第一高频磁场脉冲时，不需要的材料的纵向磁化在成像空间中在空间上均匀 。 磁共振成像装置还包括用于调节两个或多个高频磁场脉冲的翻转角的调节装置，并且控制装置以由调节装置调节的翻转角施加两个或更多个高频磁场脉冲。
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82.发明授权Magnetic resonance imaging device with multiple RF coils applying half-pulse waveforms for selective excitation of a local region 有权具有多个RF线圈的磁共振成像装置，其施加用于选择性激发局部区域的半脉冲波形公开(公告)号：US07498809B2
公开(公告)日：2009-03-03
申请号：US10540952
申请日：2003-12-24
IPC分类号： G01V3/00
CPC分类号： G01R33/483 , G01R33/4833
摘要： An MRI apparatus suitable for realizing selective excitation utilizing multiple RF transmitting coils (parallel transmission) is provided. This MRI apparatus is provided with, as an RF receiving coil or RF transmitting coil, an RF transmitting coil 104 comprising a loop coil 210, primary differential coil 220 and secondary differential coil 230 having a common central axis 201. Upon imaging, the coils 210, 220 and 230 constituting the RF transmitting coil 104 are simultaneously driven by RF signals with the same phase, and only the differential coils 220 and 230 are driven in the second half of irradiation time with phases different by 180° from the phases for the first half. Alternatively, two times of measurements are performed as a pair, in which, in the first measurement, the coils 210, 220 and 230 are simultaneously driven with RF signals of the same phase, then in the second measurement, only the differential coils 220 and 230 are driven with phases inverse to the phases for the first measurement, and the signals measured respectively are added. Such imaging or addition of the results of two times of the measurement provides a profile for exciting a local region. This enables selective excitation of only a desired region without using any RF pulse for signal suppression.
摘要翻译： 提供了适用于利用多个RF发射线圈（并行传输）实现选择性激励的MRI装置。 该MRI装置设置有作为RF接收线圈或RF发射线圈的RF发射线圈104，RF发射线圈104包括环路线圈210，初级差分线圈220和具有公共中心轴线201的次级差分线圈230.成像后，线圈210 构成RF发送线圈104的220,230同时由具有相同相位的RF信号驱动，并且仅在差分线圈220和230被驱动的照射时间的后半部分中，与第一相位相位相差180° 半。 或者，作为一对执行两次测量，其中在第一测量中，线圈210,220和230同时由相同相位的RF信号驱动，然后在第二测量中，仅差分线圈220和 230以与第一次测量的相位相反的相位驱动，并且分别测量所分别的信号。 这种成像或两次测量的结果的添加提供了用于激发局部区域的简档。 这使得仅选择性地激发期望的区域，而不使用任何用于信号抑制的RF脉冲。
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公开(公告)号：US20090012385A1
公开(公告)日：2009-01-08
申请号：US11664893
申请日：2005-10-12
IPC分类号： A61B5/055
CPC分类号： G01R33/56375 , A61B5/055 , A61B5/7257 , G01R33/4833 , G01R33/4835 , G01R33/56383
摘要： A magnetic resonance imaging apparatus including signal receiving means for detecting a nuclear magnetic resonance signal from an object, signal processing means for reconstructing an image by using the detected nuclear magnetic resonance signal and display means for displaying the image, a whole image of the examiner being obtained while each imaging site of the object is continuously or stepwise moved and disposed in the imaging space, is equipped with detecting means for detecting the gradient and size of each site of the object, inputting means for inputting reference information for carrying out magnetic resonance imaging corresponding to the gradient and size of each site of the object onto an image representing the gradient and size of each site of the object which is displayed on the display means, storage means for storing the input reference information, control means for controlling the imaging operation on the basis of the reference information stored in the storage means, and combining means for combining nuclear magnetic resonance signals obtained through the imaging operation carried out under the control to create the whole image.
摘要翻译： 一种磁共振成像装置，包括用于检测来自物体的核磁共振信号的信号接收装置，用于通过使用检测到的核磁共振信号重建图像的信号处理装置和用于显示图像的显示装置，检查器的整个图像为 在物体的每个成像部位被连续或逐步移动和放置在成像空间中时获得的装备有用于检测物体的每个部位的梯度和尺寸的检测装置，用于输入用于执行磁共振成像的参考信息的输入装置 对应于物体的每个位置的梯度和尺寸到表示显示在显示装置上的物体的每个位置的梯度和尺寸的图像，用于存储输入参考信息的存储装置，用于控制成像操作的控制装置 基于存储在存储装置中的参考信息， 以及用于组合通过在控制下执行的成像操作获得的核磁共振信号以组合整个图像的组合装置。
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公开(公告)号：US07450982B2
公开(公告)日：2008-11-11
申请号：US10549340
申请日：2004-03-12
申请人： Takayuki Abe , Tetsuhiko Takahashi
发明人： Takayuki Abe , Tetsuhiko Takahashi
IPC分类号： A61B5/055
CPC分类号： G01R33/5676 , G01R33/563
摘要： A magnetic resonance imaging system is provided wherein measurement data (k space data) is extracted easily (and instantaneously) after imaging a plurality of times phases, and an image can be displayed in dynamic MRA measurement employing a contrast medium. Dynamic measurement is carried out, including extracting the time phase evaluation values (e.g. the origin data in k space) in respective time phases and then automatically extracting a data set including a time phase where the time phase evaluation value reaches a specified threshold value.
摘要翻译： 提供了一种磁共振成像系统，其中在成像多个阶段之后容易地（并且瞬间）提取测量数据（k空间数据），并且可以使用造影剂在动态MRA测量中显示图像。 执行动态测量，包括在各个时间段中提取时间相位评估值（例如，k空间中的原始数据），然后自动提取包括时间相位评估值达到指定阈值的时间相位的数据集。
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公开(公告)号：US20080009710A1
公开(公告)日：2008-01-10
申请号：US11883700
申请日：2006-02-07
IPC分类号： A61B5/055
CPC分类号： G01R33/4836 , G01R33/446 , G01R33/4835
摘要： A magnetic resonance imaging method includes a step (1) for exciting atomic nuclei in a desired region of an object to be examined so as to cause nuclear magnetic resonance, a step (2) for detecting a nuclear magnetic resonance signal generated in the blood, and a step (3) for extracting a blood image of the object by the detected nuclear magnetic resonance signal. The desired region excited by the step (1) represents a plurality of regions arranged at a predetermined interval.
摘要翻译： 磁共振成像方法包括：步骤（1），用于激发待检测物体的期望区域中的原子核以引起核磁共振;步骤（2），用于检测在血液中产生的核磁共振信号， 以及用于通过检测到的核磁共振信号提取物体的血液图像的步骤（3）。 由步骤（1）激发的期望区域表示以预定间隔布置的多个区域。
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公开(公告)号：US07224163B2
公开(公告)日：2007-05-29
申请号：US10511964
申请日：2003-04-22
IPC分类号： G01V3/00
CPC分类号： G01R33/5611
摘要： A first pulse sequence is executed on an imaging portion of an object to be examined using a multiple receiving coils including a plurality of receiving coils to obtain sensitivity images 701 to 703, each of n in number, which is smaller than the number of examination image. When those sensitivity images are calculated, NMR signals are measured only in a low-frequency region of a k space. Next, a second pulse sequence is executed while phase encoding steps are thinned out to acquire examination images 704 and 705, each of m in number (m>n), of the object with each receiving coil. When sensitivity distributions 707 and 708 are generated on the basis of sensitivity images 701 to 703, if a sensitivity distribution on a slice corresponding to examination images 704 and 705 is not yet measured, it is calculated with a slice interpolation processing on the basis of sensitivity distributions 701 to 703, and an aliasing artifact in examination images 704 and 705 are removed using sensitivity distributions 707 and 708 with a matrix calculation.
摘要翻译： 使用包括多个接收线圈的多个接收线圈在待检查对象的成像部分上执行第一脉冲序列，以获得灵敏度图像701至703，每个n个数量小于检查图像的数量 。 当计算出这些灵敏度图像时，仅在k空间的低频区域中测量NMR信号。 接下来，执行第二脉冲序列，同时减少相位编码步骤以获取具有每个接收线圈的物体的数量（m> n）中的每一个的检查图像704和705。 当灵敏度分布707和708基于灵敏度图像701至703生成时，如果尚未测量与检查图像704和705相对应的切片上的灵敏度分布，则以基于灵敏度的切片内插处理来计算 分布701至703，并且使用具有矩阵计算的灵敏度分布707和708来去除检查图像704和705中的混叠伪影。
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公开(公告)号：US20060091884A1
公开(公告)日：2006-05-04
申请号：US10540952
申请日：2003-12-24
IPC分类号： G01V3/00
CPC分类号： G01R33/483 , G01R33/4833
摘要： An MRI apparatus suitable for realizing selective excitation utilizing multiple RF transmitting coils (parallel transmission) is provided. This MRI apparatus is provided with, as an RF receiving coil or RF transmitting coil, an RF transmitting coil 104 comprising a loop coil 210, primary differential coil 220 and secondary differential coil 230 having a common central axis 201. Upon imaging, the coils 210, 220 and 230 constituting the RF transmitting coil 104 are simultaneously driven by RF signals with the same phase, and only the differential coils 220 and 230 are driven in the second half of irradiation time with phases different by 180° from the phases for the first half. Alternatively, two times of measurements are performed as a pair, in which, in the first measurement, the coils 210, 220 and 230 are simultaneously driven with RF signals of the same phase, then in the second measurement, only the differential coils 220 and 230 are driven with phases inverse to the phases for the first measurement, and the signals measured respectively are added. Such imaging or addition of the results of two times of the measurement provides a profile for exciting a local region. This enables selective excitation of only a desired region without using any RF pulse for signal suppression.
摘要翻译： 提供了适用于利用多个RF发射线圈（并行传输）实现选择性激励的MRI装置。 该MRI装置具有作为RF接收线圈或RF发射线圈的RF发射线圈104，RF发射线圈104包括具有公共中心轴线201的环形线圈210，初级差分线圈220和次级差分线圈230。 在成像时，构成RF发射线圈104的线圈210,220和230由相同相位的RF信号同时驱动，并且只有差分线圈220和230在相位不同于180°的照射时间的后半段被驱动 从上半年的阶段。 或者，作为一对执行两次测量，其中在第一测量中，线圈210,220和230同时由相同相位的RF信号驱动，然后在第二测量中，仅差分线圈220和 230以与第一次测量的相位相反的相位驱动，并且分别测量所分别的信号。 这种成像或两次测量的结果的添加提供了用于激发局部区域的简档。 这使得仅选择性地激发期望的区域，而不使用任何用于信号抑制的RF脉冲。
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公开(公告)号：US06777934B2
公开(公告)日：2004-08-17
申请号：US10148469
申请日：2002-09-05
IPC分类号： G01V300
CPC分类号： G01R33/5611 , G01R33/5619
摘要： An MRI apparatus is provided for obtaining an image of a wide area using a multiple-coil, where a plural number of small receiving coils are arranged such that adjacent coils overlap spatially. An image is picked up while thinning a part of the measured data, such that the low spatial frequency region of the k space is dense and the high spatial frequency region thereof is sparse. The substantial sensitivity distribution of each small receiving coil is determined using data related to the low spatial frequency region, and an image is composed using the sensitivity distribution and the measured data to produce a high resolution image having no aliasing artifact in a short time.
摘要翻译： 提供一种MRI装置，用于使用多个线圈获得广域的图像，其中多个小的接收线圈被布置成使得相邻的线圈在空间上重叠。 拾取图像，同时使测量数据的一部分变薄，使得k空间的低空间频率区域是致密的，并且其高空间频率区域是稀疏的。 使用与低空间频率区域相关的数据来确定每个小接收线圈的实质灵敏度分布，并且使用灵敏度分布和测量数据构成图像以在短时间内产生不具有混叠伪影的高分辨率图像。
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89.发明授权Magnetic resonance imaging apparatus for detecting magnetic resonance signals by radio frequency receiving coils 失效用于通过射频接收线圈检测磁共振信号的磁共振成像装置
公开(公告)号：US5951474A
公开(公告)日：1999-09-14
申请号：US804925
申请日：1997-02-24
CPC分类号： G01R33/3415 , G01R33/34061 , G01R33/3678
摘要： RF receiving coil device used in a magnetic resonance imaging apparatus capable of acquiring a tomographic image of an object under examination positioned in a static magnetic field along a predetermined direction including quadrature detection coils for detecting an MR signal component along a direction perpendicular to a body axis direction of the object under examination and also perpendicular to a direction of the static magnetic field, and for detecting another MR-signal component along the body axis direction.
摘要翻译： RF接收线圈装置，其用于可以沿着预定方向获取位于静态磁场中的检查对象的断层图像，所述磁共振成像装置包括正交检测线圈，用于沿垂直于体轴的方向检测MR信号分量 检测对象的方向，也垂直于静磁场的方向，并且用于检测沿着身体轴线方向的另一个MR信号分量。
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公开(公告)号：US5559434A
公开(公告)日：1996-09-24
申请号：US516892
申请日：1995-08-18
CPC分类号： G01R33/34046 , G01R33/3642 , G01R33/3657 , G01R33/3678
摘要： An MRI RF coil including first and second ring elements having a plurality of peripheral segments connected in ring shape which are apart from each other along a common vertical axial line. The RF coil also includes a plurality of axial conductive segments for connecting the first and second ring elements electrically to each other at the contacts of the plurality of peripheral segments with a plurality of current loops being formed by neighboring axial conductive segments and two peripheral segments connected thereby. Further, at least one control signal feeding point is positioned at any one of the peripheral segments of the first or second ring elements.
摘要翻译： 一种MRI RF线圈，其包括第一和第二环形元件，所述第一和第二环形元件具有连接成环形的多个周边段，它们沿着共同的垂直轴线彼此分开。 RF线圈还包括多个轴向导电段，用于在多个周边段的触点处将第一和第二环形元件彼此电连接，多个电流环由相邻的轴向导电段形成，并且两个外围段连接 从而。 此外，至少一个控制信号馈送点位于第一或第二环形元件的任何一个外围段上。
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