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1.发明授权公开(公告)号：US08890525B2
公开(公告)日：2014-11-18
申请号：US13320766
申请日：2011-08-02
IPC分类号： G01V3/00 , G01R33/561 , G01R33/565
CPC分类号： G01R33/5616 , G01R33/56554
摘要： An MRI apparatus produces a plurality of echo signals by performing an EPI echo signal acquisition sequence including gradient magnetic fields in a phase encoding direction, and acquires a plurality of echo signals as first and second template data, respectively. The second template data is acquired using a sequence in which start timing of a gradient magnetic field in a readout direction is shifted from the case where acquisition of the first template data is performed. The phase error included in the echo signals is corrected by using the first and second template data.
摘要翻译： MRI装置通过执行包括相位编码方向上的梯度磁场的EPI回波信号获取序列来产生多个回波信号，并且分别获取多个回波信号作为第一和第二模板数据。 使用其中执行读取方向上的梯度磁场的开始定时与执行第一模板数据的获取的情况相移的顺序来获取第二模板数据。 通过使用第一和第二模板数据来校正回波信号中包括的相位误差。
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2.发明申请公开(公告)号：US20120146640A1
公开(公告)日：2012-06-14
申请号：US13320766
申请日：2011-08-02
IPC分类号： G01R33/48
CPC分类号： G01R33/5616 , G01R33/56554
摘要： According to one embodiment, an MRI apparatus (20) includes a first acquisition unit, a second acquisition unit and a correction unit (100). The first and second acquisition units produce a plurality of echo signals by performing echo signal acquisition sequence of EPI including application of a gradient magnetic field in a phase encoding direction, and acquire the plurality of echo signals as first and second template data, respectively. The second acquisition unit acquires the second template data under a sequence in which start timing of application of a gradient magnetic field in a readout direction is shifted from the case where acquisition of the first template data is performed. The correction unit (100) corrects phase error included in the echo signals by using the first and second template data.
摘要翻译： 根据一个实施例，MRI装置（20）包括第一获取单元，第二获取单元和校正单元（100）。 第一和第二采集单元通过执行包括在相位编码方向上施加梯度磁场的EPI的回波信号获取序列来产生多个回波信号，并分别获取多个回波信号作为第一和第二模板数据。 第二获取单元从执行读取方向的倾斜磁场的开始定时与执行第一模板数据的获取的情况相移的顺序获取第二模板数据。 校正单元（100）通过使用第一和第二模板数据来校正包含在回波信号中的相位误差。
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3.发明授权公开(公告)号：US08581581B2
公开(公告)日：2013-11-12
申请号：US13623920
申请日：2012-09-21
IPC分类号： G01V3/00
CPC分类号： G01R33/56341 , A61B5/055 , A61B5/7203 , G01R33/5616 , G01R33/56509 , G01R33/56518
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes an imaging unit and a strain correction unit. The imaging unit is configured to acquire frames of diffusion weighted image data corresponding to different b-values by diffusion weighted imaging with applying MPG pulses corresponding to the different b-values of which application axes are same. The strain correction unit is configured to calculate a strain correction coefficient for diffusion weighted image data to be a target of a strain correction based on diffusion weighted image data corresponding to a b-value different from a b-value corresponding to the diffusion weighted image data to be the target of the strain correction among the frames of the diffusion weighted image data to generate image data after the strain correction by the strain correction of the diffusion weighted image data to be the target of the strain correction using the calculated strain correction coefficient.
摘要翻译： 根据一个实施例，磁共振成像装置包括成像单元和应变校正单元。 成像单元被配置为通过扩散加权成像来获取与不同b值对应的扩散加权图像数据的帧，其中应用与应用轴相同的不同b值对应的MPG脉冲。 应变校正单元被配置为基于与对应于扩散加权图像数据的b值不同的b值的扩散加权图像数据来计算扩散加权图像数据的应变校正系数，作为应变校正的目标 作为扩散加权图像数据的帧之间的应变校正的目标，以通过利用计算的应变校正系数将扩散加权图像数据的应变校正作为应变校正的目标来生成应变校正后的图像数据。
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4.发明申请公开(公告)号：US20130009641A1
公开(公告)日：2013-01-10
申请号：US13615891
申请日：2012-09-14
IPC分类号： G01R33/48
CPC分类号： G01R33/54 , G01R33/3852 , G01R33/4818 , G01R33/56545 , G01R33/56554 , G01R33/56572
摘要： According to one embodiment, a control device (30) of a magnetic resonance imaging apparatus (20A) includes a condition setting unit (100) and a judging unit (102). The condition setting unit sets an imaging sequence performed by the magnetic resonance imaging apparatus based on conditions of the imaging sequence. The judging unit calculates a value of electric current supplied to a gradient magnetic field coil (26) of the magnetic resonance imaging apparatus based on the conditions of the imaging sequence, calculates a value of voltage applied to the gradient magnetic field coil based on “a mutual inductance by which the gradient magnetic field coil causes mutual induction” so that electric current flowing the gradient magnetic field coil becomes equal to the value of electric current calculated, and judges whether the imaging sequence is practicable or not based on the value of voltage.
摘要翻译： 根据一个实施例，磁共振成像设备（20A）的控制设备（30）包括条件设置单元（100）和判断单元（102）。 条件设定单元基于成像序列的条件设定由磁共振成像装置执行的成像序列。 判断单元根据摄像顺序的条件，计算供给到磁共振成像装置的倾斜磁场线圈（26）的电流值，根据相互的关系计算施加到倾斜磁场线圈的电压值 电感，梯度磁场线圈引起相互感应，使得流过梯度磁场线圈的电流等于计算出的电流值，并根据电压值判断摄像顺序是否可行。
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5.发明授权公开(公告)号：US09188656B2
公开(公告)日：2015-11-17
申请号：US13414073
申请日：2012-03-07
申请人： Masao Yui , Hiroshi Kusahara
发明人： Masao Yui , Hiroshi Kusahara
IPC分类号： G01R33/24 , G01R33/32 , G01R33/565 , G01R33/561
CPC分类号： G01R33/56518 , G01R33/5616
摘要： According to one embodiment, a magnetic resonance imaging apparatus includes a data acquisition unit, an eddy magnetic field measuring unit and an imaging unit. The data acquisition unit is configured to acquire magnetic resonance signals at mutually different timings with applying a gradient magnetic field for generating an eddy magnetic field. The eddy magnetic field measuring unit is configured to acquire eddy magnetic field information including a time constant of the eddy magnetic field based on phase information of the magnetic resonance signals acquired at the timings. The imaging unit is configured to perform imaging under an imaging condition or a data processing condition according to the eddy magnetic field information.
摘要翻译： 根据一个实施例，磁共振成像装置包括数据采集单元，涡流磁场测量单元和成像单元。 数据采集单元被配置为通过施加用于产生涡流磁场的梯度磁场在相互不同的定时获取磁共振信号。 涡电磁场测量单元被配置为基于在该定时获取的磁共振信号的相位信息来获取包括涡流磁场的时间常数的涡流磁场信息。 成像单元被配置为根据涡流磁场信息在成像条件或数据处理条件下执行成像。
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6.发明申请公开(公告)号：US20110095760A1
公开(公告)日：2011-04-28
申请号：US12521804
申请日：2009-02-13
IPC分类号： G01R33/48
CPC分类号： G01R33/56563 , A61B5/055 , G01R33/56518 , G01R33/56572
摘要： A magnetic resonance imaging apparatus has a storage unit and a processing unit. The storage unit stores correction data of a position coordinate, in which the position coordinate in the reconstruction FOV is caused to correspond to a position coordinate in a display FOV included in the reconstruction FOV based on an intensity of a gradient magnetic field. If both of a first position coordinate and a second position coordinate, which is further from the center of the reconstruction FOV, correspond to same position coordinate in the display FOV, the correction data is data for causing only the first position coordinate to correspond to the position coordinate in the display FOV. The processing unit corrects a reconstructed image based on the correction data and obtains an image of the display FOV.
摘要翻译： 磁共振成像装置具有存储单元和处理单元。 存储单元存储基于梯度磁场的强度，使重建FOV中的位置坐标与包括在重建FOV中的显示器FOV中的位置坐标相对应的位置坐标的校正数据。 如果距离重建FOV的中心更远的第一位置坐标和第二位置坐标都与显示器FOV中的相同位置坐标相对应，则校正数据是仅使第一位置坐标对应于 位置坐标在显示FOV。 处理单元基于校正数据校正重构图像，并获得显示器FOV的图像。
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7.发明授权公开(公告)号：US08368397B2
公开(公告)日：2013-02-05
申请号：US12521804
申请日：2009-02-13
IPC分类号： G01V3/00
CPC分类号： G01R33/56563 , A61B5/055 , G01R33/56518 , G01R33/56572
摘要： A magnetic resonance imaging apparatus has a storage unit and a processing unit. The storage unit stores correction data of a position coordinate, in which the position coordinate in the reconstruction FOV is caused to correspond to a position coordinate in a display FOV included in the reconstruction FOV based on an intensity of a gradient magnetic field. If both of a first position coordinate and a second position coordinate, which is further from the center of the reconstruction FOV, correspond to same position coordinate in the display FOV, the correction data is data for causing only the first position coordinate to correspond to the position coordinate in the display FOV. The processing unit corrects a reconstructed image based on the correction data and obtains an image of the display FOV.
摘要翻译： 磁共振成像装置具有存储单元和处理单元。 存储单元存储基于梯度磁场的强度，使重建FOV中的位置坐标与包括在重建FOV中的显示器FOV中的位置坐标相对应的位置坐标的校正数据。 如果距离重建FOV的中心更远的第一位置坐标和第二位置坐标都与显示器FOV中的相同位置坐标相对应，则校正数据是仅使第一位置坐标对应于 位置坐标在显示FOV。 处理单元基于校正数据校正重构图像，并获得显示器FOV的图像。
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