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公开(公告)号：US06876201B2
公开(公告)日：2005-04-05
申请号：US10468963
申请日：2002-02-25
IPC分类号： G01R33/3415 , G01R33/561 , G01V3/00
CPC分类号： G01R33/5611 , G01R33/3415
摘要： A magnetic resonance imaging apparatus includes a magnetic field generation means for applying gradient magnetic fields and a radio-frequency magnetic field to a patient placed in a static magnetic field in a predetermined pulse sequence; a multiple RF receiving coil comprising at least three RF receiving coils for receiving the nuclear magnetic resonance signals generated from the patient; and an image reconstruction means for reconstructing an image by processing the received nuclear magnetic resonance signals, wherein the image reconstruction means includes a coil selection means for selecting a plurality of RF receiving coil groups that are preset by combining the plurality of RF receiving coils according to imaging conditions, a synthesization means for synthesizing the measured data received by the respective RF receiving coils of each of the plurality of selected RF receiving coil groups, and a calculation means for eliminating aliasing artifacts by executing a matrix calculation as to the synthesized data.
摘要翻译： 磁共振成像装置包括磁场产生装置，用于以预定的脉冲序列向放置在静态磁场中的患者施加梯度磁场和射频磁场; 多个RF接收线圈，其包括用于接收从患者产生的核磁共振信号的至少三个RF接收线圈; 以及图像重建装置，用于通过处理所接收的核磁共振信号来重建图像，其中图像重建装置包括线圈选择装置，用于选择通过组合多个RF接收线圈来预设的多个RF接收线圈组，根据 成像条件，用于合成由多个选择的RF接收线圈组中的每一个的相应RF接收线圈接收的测量数据的合成装置，以及用于通过执行关于合成数据的矩阵计算来消除混叠伪像的计算装置。
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32.发明授权公开(公告)号：US09714994B2
公开(公告)日：2017-07-25
申请号：US13881207
申请日：2011-10-28
IPC分类号： G01V3/00 , G01R33/48 , G01R33/565 , G01R33/28
CPC分类号： G01R33/48 , G01R33/28 , G01R33/4824 , G01R33/56572
摘要： In order to approximate the gradient magnetic field pulse waveform shape with high accuracy and improve the image quality at the time of imaging cross-section change or oblique imaging, an MRI apparatus of the present invention divides the waveform shape of the gradient magnetic field pulse into a plurality of sections, defines an approximation function for each section, and corrects the k-space coordinates at which the echo signal is arranged using the parameter of the approximation function. In addition, an optimal parameter of the approximation function of the waveform shape of the gradient magnetic field pulse is searched for using the measured signal.
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公开(公告)号：US08594766B2
公开(公告)日：2013-11-26
申请号：US12278237
申请日：2007-02-01
IPC分类号： A61B5/05
CPC分类号： G01R33/56375 , A61B5/055 , A61B5/7207 , A61B5/7257 , G01R33/5615 , G01R33/5616 , G01R33/5617 , G01R33/56383
摘要： In the continuous moving table imaging, high-speed imaging such as the echo planar method is implemented without deteriorating image quality, realizing a high-speed table movement, namely, high-speed imaging.In the magnetic resonance imaging apparatus, an imaging control means for controlling a magnetic field generation means, a transfer means, and a signal processing means executes an imaging sequence for applying multiple readout gradient magnetic fields to measure multiple nuclear magnetic resonance signals, after one-time application of an exciting RF pulse, while moving the transfer means. On this occasion, a positional deviation of the readout gradient magnetic fields given to the multiple nuclear magnetic resonance signals, caused by the movement of the transfer means, is calculated in advance as correction data, so that the measured nuclear magnetic resonance signals are corrected by the correction data.
摘要翻译： 在连续移动台成像中，采用回波平面方式的高速成像，而不会降低图像质量，实现高速表移动，即高速成像。 在磁共振成像装置中，用于控制磁场产生装置，传送装置和信号处理装置的成像控制装置执行用于施加多个读出梯度磁场以测量多个核磁共振信号的成像序列， 在移动传送装置的同时应用激发的RF脉冲。 在这种情况下，预先计算由转印装置的移动引起的给予多个核磁共振信号的读出梯度磁场的位置偏差作为校正数据，以便测量的核磁共振信号由 校正数据。
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34.发明申请公开(公告)号：US20130207654A1
公开(公告)日：2013-08-15
申请号：US13881207
申请日：2011-10-28
CPC分类号： G01R33/48 , G01R33/28 , G01R33/4824 , G01R33/56572
摘要： In order to approximate the gradient magnetic field pulse waveform shape with high accuracy and improve the image quality at the time of imaging cross-section change or oblique imaging, an MRI apparatus of the present invention divides the waveform shape of the gradient magnetic field pulse into a plurality of sections, defines an approximation function for each section, and corrects the k-space coordinates at which the echo signal is arranged using the parameter of the approximation function. In addition, an optimal parameter of the approximation function of the waveform shape of the gradient magnetic field pulse is searched for using the measured signal.
摘要翻译： 为了以高精度近似梯度磁场脉冲波形形状，并且在成像截面变化或倾斜成像时提高图像质量，本发明的MRI装置将梯度磁场脉冲的波形形状分为 多个部分定义每个部分的近似函数，并且使用近似函数的参数来校正排列回波信号的k空间坐标。 此外，使用测量信号搜索梯度磁场脉冲的波形形状的近似函数的最佳参数。
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35.发明授权Parallel imaging in non-cartesian magnetic resonance imaging (MRI) and MRI apparatus realizing the same 有权并行成像在非笛卡尔磁共振成像（MRI）和MRI设备中实现相同公开(公告)号：US08207734B2
公开(公告)日：2012-06-26
申请号：US12529396
申请日：2008-03-03
IPC分类号： G01V3/00
CPC分类号： G01R33/5611 , G01R33/4824 , G01R33/5615
摘要： An MRI apparatus capable of performing a high-speed operation for removing aliasing from the data measured by non-Cartesian imaging in a real space with a small amount of operation is provided. Non-Cartesian data sampling is performed by thinning the number of data by using multiple receiver coils having different sensitivity distribution from each other. Image reconstruction means creates orthogonal data by gridding non-orthogonal data obtained by each receiver coil on a grid having an equal spatial resolution to and a narrower field of view than a target image, subjects it to Fourier transform and creates the first image data containing aliasing components. The second image data is created by using the first image data created for each receiver coil and a sensitivity distribution of each receiver coil.
摘要翻译： 提供了一种MRI装置，其能够执行用于以少量操作在实际空间中通过非笛卡尔成像测量的数据去除混叠的高速操作。 通过使用具有彼此不同的灵敏度分布的多个接收器线圈来稀疏数据来执行非笛卡尔数据采样。 图像重建装置通过网格化由每个接收器线圈获得的非正交数据在具有与目标图像相等的空间分辨率和较窄视场的网格上产生正交数据，使其进行傅里叶变换，并创建包含混叠的第一图像数据 组件。 通过使用为每个接收器线圈创建的第一图像数据和每个接收器线圈的灵敏度分布来创建第二图像数据。
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公开(公告)号：US20110200243A1
公开(公告)日：2011-08-18
申请号：US13124527
申请日：2009-10-13
IPC分类号： G06K9/20
CPC分类号： G01R33/4824 , G01R33/56518 , G01R33/56572
摘要： Disclosed is a magnetic resonance imaging apparatus comprising static magnetic field generation means, gradient magnetic field generation means, high-frequency magnetic field generation means, reception means, signal processing means, and control means which controls the gradient magnetic field generation means, the high-frequency magnetic field generation means, the reception means, and the signal processing means, wherein said apparatus comprises: approximation means that approximates the output error of the gradient magnetic field using a combination of multiple parameter values with respect to each direction of the gradient magnetic field; evaluation means that evaluates the combinations of multiple parameter values based on the image quality of a magnetic resonance image that is reconstructed while taking into account the output error of the gradient magnetic field that has been approximated by the approximation means; and determination means that, based on the result of the evaluation by the evaluation means, determines a desired combination among the combinations of multiple parameter values.
摘要翻译： 公开了一种磁共振成像装置，包括静磁场产生装置，梯度磁场产生装置，高频磁场产生装置，接收装置，信号处理装置和控制梯度磁场产生装置的控制装置， 频率磁场产生装置，接收装置和信号处理装置，其中所述装置包括：近似装置，其使用相对于梯度磁场的每个方向的多个参数值的组合近似梯度磁场的输出误差 ; 评估装置，其基于重构的磁共振图像的图像质量来评估多个参数值的组合，同时考虑已经由近似装置近似的梯度磁场的输出误差; 并且确定意味着基于评估装置的评估结果确定多个参数值的组合之间的期望组合。
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公开(公告)号：US07847546B2
公开(公告)日：2010-12-07
申请号：US11996865
申请日：2006-07-25
IPC分类号： G01V3/00
CPC分类号： G01R33/561 , G01R33/4824 , G01R33/56375 , G01R33/56383 , G01R33/56518 , G01R33/56563 , G01R33/56572
摘要： An MRI apparatus includes an imaging means being provided with a means for generating magnetic fields respectively of a static magnetic field, a gradient magnetic field, and an RF magnetic field, and a means for receiving an echo signal generated from a subject, the imaging means being for measuring echo data associated with at least one measurement trajectory in k-space, while varying angles with respect to a coordinate axis in the k-space of the measurement trajectory, so as to collect at least one measured data for each of the angles; and an image reconstruction means for rearranging the measured data in the k-space and reconstructing an image; wherein, the image reconstruction means calculates a phase for correction based on standard data selected from the measured data for each of the angles, prior to rearranging the measured data in the k-space, and performs a phase correction as to the measured data, by using the phase for correction being calculated. With the procedure above, it is possible to reduce an artifact caused by the nonlinearity of the gradient magnetic field and/or inhomogeneities of the magnetic field, without extending the imaging time.
摘要翻译： MRI装置包括成像装置，其具有分别产生静磁场，梯度磁场和RF磁场的磁场的装置，以及用于接收从被摄体产生的回波信号的装置，所述成像装置 用于测量与k空间中的至少一个测量轨迹相关联的回波数据，同时相对于测量轨迹的k空间中的坐标轴改变角度，以便针对每个角度收集至少一个测量数据 ; 以及图像重建装置，用于重新排列k空间中的测量数据并重构图像; 其特征在于，所述图像重构单元在重新排列所述k空间内的测量数据之前，根据从所测量的每个角度的数据中选出的标准数据，计算出校正相位，并对所述测量数据进行相位修正， 使用校正相位进行计算。 通过上述过程，可以减少由梯度磁场的非线性引起的伪影和/或磁场的不均匀性，而不会延长成像时间。
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38.发明申请公开(公告)号：US20100039110A1
公开(公告)日：2010-02-18
申请号：US12529396
申请日：2008-03-03
CPC分类号： G01R33/5611 , G01R33/4824 , G01R33/5615
摘要： An MRI apparatus capable of performing a high-speed operation for removing aliasing from the data measured by non-Cartesian imaging in a real space with a small amount of operation is provided. Non-Cartesian data sampling is performed by thinning the number of data by using multiple receiver coils having different sensitivity distribution from each other. Image reconstruction means creates orthogonal data by gridding non-orthogonal data obtained by each receiver coil on a grid having an equal spatial resolution to and a narrower field of view than a target image, subjects it to Fourier transform and creates the first image data containing aliasing components. The second image data is created by using the first image data created for each receiver coil and a sensitivity distribution of each receiver coil.
摘要翻译： 提供了一种MRI装置，其能够执行用于以少量操作在实际空间中通过非笛卡尔成像测量的数据去除混叠的高速操作。 通过使用具有彼此不同的灵敏度分布的多个接收器线圈来稀疏数据来执行非笛卡尔数据采样。 图像重建装置通过网格化由每个接收器线圈获得的非正交数据在具有与目标图像相等的空间分辨率和较窄视场的网格上产生正交数据，使其进行傅里叶变换，并创建包含混叠的第一图像数据 组件。 通过使用为每个接收器线圈创建的第一图像数据和每个接收器线圈的灵敏度分布来创建第二图像数据。
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公开(公告)号：US07635979B2
公开(公告)日：2009-12-22
申请号：US11919383
申请日：2006-04-25
IPC分类号： G01V3/00
CPC分类号： A61B5/055 , A61B5/7257 , G01R33/56375 , G01R33/56383
摘要： In performing the moving table imaging, an MRI apparatus and a method thereof are provided, which minimizes image degradation and reduces imaging time. When an image of a wide range of a test object is taken, the imaging is repeated while changing the gradient magnetic field intensity in a phase-encode direction, as well as changing the size of field of view FOV in the readout direction by changing the readout gradient magnetic field intensity in reading out the data, according to the phase-encode amount. In a part where the FOV is expanded, data acquisition frequency is lowered, and consequently, the total imaging time is reduced. The data sampling time may be changed along with the change of the FOV, and therefore, a process for achieving a unique matrix size in the readout direction is rendered unnecessary, and a spatial resolution can be maintained.
摘要翻译： 在执行移动台成像时，提供了MRI装置及其方法，其使图像劣化最小化并减少成像时间。 当拍摄大范围的测试对象的图像时，在相位编码方向改变梯度磁场强度的同时重复成像，并且通过改变读出方向来改变视场FOV的大小 根据相位编码量读出数据时的读出梯度磁场强度。 在FOV扩展的部分，数据采集频率降低，因此总成像时间减少。 可以随着FOV的变化而改变数据采样时间，因此，不需要在读出方向上实现唯一的矩阵尺寸的处理，并且可以保持空间分辨率。
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公开(公告)号：US07622926B2
公开(公告)日：2009-11-24
申请号：US11721707
申请日：2005-12-22
IPC分类号： G01V3/00
CPC分类号： G01R33/56509 , G01R33/4824 , G01R33/561 , G01R33/5614 , G01R33/5616
摘要： Provided is a magnetic resonance imaging apparatus capable of highly precisely detecting and compensating body motions within a short processing time during radial scanning. The magnetic resonance imaging apparatus includes a control unit that applies radiofrequency magnetic fields and magnetic field gradients to a subject lying down in a static magnetic field and that detects magnetic resonance signals generated from the subject, and an arithmetic unit that handles the signals. The arithmetic unit performs subject's body motion detection in an image space, uses an image, which is reconstructed using the low-frequency portion of the k-space data of the image, as criterial data, produces templates by moving the criterial data in advance by predetermined magnitudes of rotations and predetermined magnitudes of translations, and uses the produced templates to perform the body motion detection.
摘要翻译： 提供一种磁共振成像装置，其能够在径向扫描期间在短的处理时间内高精度地检测和补偿身体运动。 磁共振成像装置包括：控制单元，其对位于静态磁场中的被摄体进行射频磁场和磁场梯度，并且检测从被检体产生的磁共振信号;以及运算单元，其处理该信号。 算术单元在图像空间中进行被摄体的身体运动检测，使用利用图像的k空间数据的低频部分重构的图像作为标准数据，通过预先移动标准数据来生成模板 预定的旋转角度和预定的平移量，并且使用所产生的模板来执行身体运动检测。
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