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公开(公告)号：US09198599B2
公开(公告)日：2015-12-01
申请号：US13642573
申请日：2011-04-20
IPC分类号： A61B5/055 , G01R33/56 , G01R33/561 , A61B5/00 , G06T5/00
CPC分类号： A61B5/055 , A61B5/0042 , A61B2576/026 , G01R33/5608 , G01R33/5613 , G06T5/009 , G06T2207/10088
摘要： Image processing techniques which enable various contrast control, by quantitatively handling a degree of phase enhancement in a contrast control as a post-processing of the image reconstruction. A complex operation is performed on each pixel value of a complex image obtained by an MRI, thereby generating an image with desired contrast. Intensity is controlled by increasing or decreasing the argument of the pixel value of each pixel by a constant amount, and the degree of phase enhancement is controlled by multiplying the phase (argument) of each pixel by a constant.
摘要翻译： 通过定量处理对比度控制中的相位增强程度作为图像重构的后处理，可以实现各种对比度控制的图像处理技术。 对通过MRI获得的复合图像的每个像素值执行复杂操作，从而生成具有期望对比度的图像。 通过将每个像素的像素值的自变量增加或减小恒定量来控制强度，并且通过将每个像素的相位（自变量）乘以常数来控制相位增强的程度。
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公开(公告)号：US20130049753A1
公开(公告)日：2013-02-28
申请号：US13642573
申请日：2011-04-20
IPC分类号： G01R33/56
CPC分类号： A61B5/055 , A61B5/0042 , A61B2576/026 , G01R33/5608 , G01R33/5613 , G06T5/009 , G06T2207/10088
摘要： The present invention provides an image processing technique which enables various contrast control, by quantitatively handling a degree of phase enhancement in a contrast control as a post-processing of the image reconstruction. A complex operation is performed on each pixel value of a complex image obtained by an MRI, thereby generating an image with desired contrast. Intensity is controlled by increasing or decreasing the argument of the pixel value of each pixel by a constant amount, and the degree of phase enhancement is controlled by multiplying the phase (argument) of each pixel by a constant.
摘要翻译： 本发明提供一种图像处理技术，其能够通过定量地处理对比度控制中的相位增强程度来进行各种对比度控制，作为图像重构的后处理。 对通过MRI获得的复合图像的每个像素值执行复杂操作，从而生成具有期望对比度的图像。 通过将每个像素的像素值的自变量增加或减小恒定量来控制强度，并且通过将每个像素的相位（自变量）乘以常数来控制相位增强的程度。
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3.发明授权公开(公告)号：US09476956B2
公开(公告)日：2016-10-25
申请号：US13984537
申请日：2012-01-19
申请人： Yo Taniguchi , Suguru Yokosawa , Yoshitaka Bito
发明人： Yo Taniguchi , Suguru Yokosawa , Yoshitaka Bito
IPC分类号： G01R33/56 , A61B5/055 , G01R33/565 , G01R33/561
CPC分类号： G01R33/56 , A61B5/055 , G01R33/5614 , G01R33/5616 , G01R33/56554 , G01R33/56572
摘要： In order to improve image quality, a technique for obtaining information for eliminating distortions of the k-space in the readout direction and the phase encoding direction caused by the waveform distortion of the gradient magnetic field pulse is provided. A pulse sequence for the main scan is used to repeatedly measure echoes with changing the time integral value of the dephasing pulse for the readout gradient magnetic field. In the above measurement, the phase encoding pulse is not made zero, but two-dimensional data are measured in the same manner as that of the main scan. By using the measured two-dimensional data, correction information for eliminating distortions of the k-space in the readout direction and the phase encoding direction caused by the waveform distortion of the gradient magnetic field pulse is calculated in each of the readout direction and the phase encoding direction.
摘要翻译： 为了提高图像质量，提供了一种用于获得用于消除由梯度磁场脉冲的波形失真引起的读出方向和相位编码方向上的k空间的失真的信息的技术。 用于主扫描的脉冲序列用于通过改变读出梯度磁场的去相位脉冲的时间积分值来重复测量回波。 在上述测量中，相位编码脉冲不为零，而是以与主扫描相同的方式测量二维数据。 通过使用所测量的二维数据，在每个读出方向和相位上计算用于消除由梯度磁场脉冲的波形失真引起的读出方向上的k空间的失真和相位编码方向的校正信息 编码方向。
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公开(公告)号：US20110112393A1
公开(公告)日：2011-05-12
申请号：US13054155
申请日：2009-07-22
IPC分类号： A61B5/055
CPC分类号： G01R33/56518 , A61B5/055 , A61B5/7257 , G01R33/5616 , G01R33/56341 , G01R33/56563
摘要： In the diffusion-weighted imaging, amounts of distortion and amounts of phase offset of k-space data due to a temporally changing magnetic field error induced by eddy currents and vibrations associated with application of a diffusion-weighted gradient magnetic field pulse are corrected with good precision to improve image quality. Characteristic data for correcting distortion of k-space data are calculated for every position in the slice direction as peak shifts of projections observed between the cases of applying and not applying an MPG pulse. As the characteristic data, amounts of distortion in the read-out direction and the phase encoding direction and phase offset amounts in a slice plane are calculated.
摘要翻译： 在扩散加权成像中，由于由涡流引起的瞬时变化的磁场误差和与施加扩散加权梯度磁场脉冲相关的振动引起的k空间数据的失真量和相位偏移量被校正为良好 精度提高图像质量。 针对切片方向上的每个位置计算用于校正k空间数据的失真的特征数据，作为施加和不施加MPG脉冲的情况之间观察到的投影的峰值偏移。 作为特征数据，计算读取方向上的失真量和切片平面中的相位编码方向和相位偏移量。
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公开(公告)号：US07723987B2
公开(公告)日：2010-05-25
申请号：US12071896
申请日：2008-02-27
申请人： Yoshitaka Bito , Yo Taniguchi , Toru Shirai , Shinji Kurokawa
发明人： Yoshitaka Bito , Yo Taniguchi , Toru Shirai , Shinji Kurokawa
IPC分类号： G01V3/00
CPC分类号： G01R33/4833 , G01R33/4835 , G01R33/561
摘要： A magnetic resonance measurement technique is provided which shortens the measurement time while suppressing artifacts caused by body movement of a measuring object and enables high-speed imaging. An excitation pulse which excites a plurality of slice planes and an excitation pulse which excites slice planes perpendicular to the slice planes are applied and a plurality of substantially parallel linear crossing areas are simultaneously measured. Spatial information of a linear direction of the crossing areas is acquired by modulating a magnetic resonance signal from the crossing areas by a gradient magnetic field. A spatial information of a direction perpendicular to the linear direction is acquired by changing the position of the plane and an image is reconstructed.
摘要翻译： 提供一种磁共振测量技术，其可以在抑制由测量对象的身体移动引起的伪像的同时缩短测量时间并且能够进行高速成像。 激励激发多个切片平面的激励脉冲和激发与切片平面垂直的切片平面的激励脉冲，同时测量多个基本上平行的线性交叉区域。 交叉区域的线性方向的空间信息是通过梯度磁场调制来自交叉区域的磁共振信号而得到的。 通过改变平面的位置并且重建图像来获取垂直于线性方向的方向的空间信息。
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公开(公告)号：US5808467A
公开(公告)日：1998-09-15
申请号：US653315
申请日：1996-05-24
申请人： Hisaaki Ochi , Yo Taniguchi , Kenichi Okajima , Yoshitaka Bito , Etsuji Yamamoto
发明人： Hisaaki Ochi , Yo Taniguchi , Kenichi Okajima , Yoshitaka Bito , Etsuji Yamamoto
IPC分类号： G01R33/3415 , G01V3/00
CPC分类号： G01R33/3415
摘要： In the inspection system using nuclear magnetic resonance comprising magnetic field generators such as a static magnetic field, a gradient magnetic field, and an RF magnetic field, an RF probe for detecting an NMR signal from a subject, and a calculator for operating a detected signal by the RF probe, a RF probe for detection comprises a plurality of coils arranged in the predetermined direction and includes a plurality of switching elements and the inspection system selects two or more coils from the plurality of coils for each measurement of NMR signals, turns the switching elements connected to the selected coils ON, turns the switching elements connected to coils other than the selected coils OFF, changes a combination of two or more coils for each measurement of NMR signals, and changes the sensitivity distribution of the RF probe in the predetermined direction according to the Wavelet basis function for each measurement of NMR signals.
摘要翻译： 在使用包括诸如静磁场，梯度磁场和RF磁场的磁场发生器的核磁共振的检查系统中，用于检测来自被检体的NMR信号的RF探针和用于操作检测信号的计算器 通过RF探头，用于检测的RF探针包括沿预定方向布置的多个线圈，并且包括多个开关元件，并且检查系统从每个测量NMR信号中选择来自多个线圈的两个或更多个线圈， 连接到所选择的线圈的开关元件接通，将与所选线圈以外的线圈相连的开关元件断开，对每个NMR信号的测量改变两个或更多个线圈的组合，并将RF探针的灵敏度分布改变为预定的 根据每个NMR信号测量的小波基函数的方向。
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公开(公告)号：US08614574B2
公开(公告)日：2013-12-24
申请号：US12993905
申请日：2009-05-22
CPC分类号： A61B5/055 , A61B5/7285 , A61B5/7289 , A61B5/7292 , G01R33/288 , G01R33/543 , G01R33/5614 , G01R33/56325 , G01R33/5635
摘要： A magnetic resonance imaging apparatus is provided, which is capable of reducing SAR while maintaining S/N ratio and image contrast in a GrE-type pulse sequence, regardless of whether a synchronous imaging is performed or not.The present invention controls a flip angle as to each measurement set 409 that is obtained by division according to the size of phase encoding and a body motion cycle of a subject in the GrE-type pulse sequence. In a set 501 which measures echoes with phase encoding having a minimum absolute value, the flip angle is maximized as to the RF pulse having a minimum phase encoding amount and at least one RF pulse irradiated immediately before. As for the other RF pulses, the flip angle varies within a range less than the maximum, irrespective of the non-imaging mode, the imaging mode, or the size of phase encoding.
摘要翻译： 提供一种磁共振成像装置，其能够在保持GrE型脉冲序列中的S / N比和图像对比度的同时减小SAR，而不管是否执行同步成像。 本发明通过根据GrE型脉冲序列中的对象的相位编码的大小和体动周期进行分割而获得的每个测量组409来控制翻转角。 在测量具有最小绝对值的相位编码回波的组501中，对于具有最小相位编码量的RF脉冲和紧接着照射的至少一个RF脉冲，翻转角度最大化。 对于其他RF脉冲，翻转角度在小于最大值的范围内变化，而与非成像模式，成像模式或相位编码的大小无关。
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公开(公告)号：US08188739B2
公开(公告)日：2012-05-29
申请号：US12519197
申请日：2007-06-29
申请人： Toru Shirai , Yoshitaka Bito , Yo Taniguchi , Satoshi Hirata
发明人： Toru Shirai , Yoshitaka Bito , Yo Taniguchi , Satoshi Hirata
IPC分类号： G01V3/00
CPC分类号： G01R33/485 , G01R33/483 , G01R33/5602 , G01R33/5607
摘要： A method for obtaining the most appropriate amplitude of signal suppression pulse, which suppresses unnecessary signals from the substance not subjected to measurement, highly accurately, swiftly and stably, and an MRI apparatus that enables the optimization are provided.A pulse amplitude adjusting means equipped in the MRI apparatus acquires signals while changing the amplitude of signal suppression pulse and calculates signal absolute values and phase values, and computes reference signals, which are polarized signal absolute values, based on the changes in signal phase values. This reference signals are subjected to polynomial fitting. A value which makes this fitting curve is 0 or closes to 0 is set as the optimal pulse amplitude.
摘要翻译： 提供了一种用于获得信号抑制脉冲的最适当振幅的方法，其能够高度准确，快速且稳定地抑制不被测量的物质的不必要的信号，并且提供能够进行优化的MRI装置。 装备在MRI装置中的脉冲幅度调整装置在改变信号抑制脉冲的振幅的同时获取信号，并且计算信号绝对值和相位值，并且基于信号相位值的变化来计算作为极化信号绝对值的参考信号。 该参考信号经过多项式拟合。 使该拟合曲线为0或接近0的值被设定为最佳脉冲幅度。
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公开(公告)号：US20120093385A1
公开(公告)日：2012-04-19
申请号：US13380201
申请日：2010-06-22
申请人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito
发明人： Suguru Yokosawa , Yo Taniguchi , Yoshitaka Bito
IPC分类号： G06K9/62
CPC分类号： A61B5/055 , A61B5/0037 , A61B5/0042 , A61B5/4528 , A61B5/4533 , A61B2576/026 , G01R33/4833 , G01R33/543 , G01R33/546
摘要： There is provided a technique for, in a medical imaging apparatus enabling imaging of an arbitrary plane in a three-dimensional space, enabling automatic calculation of a slice position and automatic calculation of an extracting slice in MPR, without prolonging examination time. Two-dimensional scout scan similar to that used for manual setting of a slice position is performed, and the obtained scout images are processed to calculate a recommended slice position. Algorithms for the processing and various image processing procedures used for the processing are stored beforehand for every type of imaging region and every type of examination.
摘要翻译： 本发明提供一种技术，在能够对三维空间中的任意平面进行成像的医疗成像装置中，能够自动计算切片位置并自动计算MPR中的提取切片，而不延长检查时间。 执行类似于用于手动设置切片位置的二维侦察扫描，并且对所获得的侦察图像进行处理以计算推荐切片位置。 用于处理的算法和用于处理的各种图像处理程序预先存储在每种类型的成像区域和每种类型的检查中。
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公开(公告)号：US20080009703A1
公开(公告)日：2008-01-10
申请号：US11797878
申请日：2007-05-08
申请人： Yoshitaka Bito , Hisaaki Ochi , Yo Taniguchi , Satoshi Hirata , Toru Shirai
发明人： Yoshitaka Bito , Hisaaki Ochi , Yo Taniguchi , Satoshi Hirata , Toru Shirai
IPC分类号： A61B5/05
CPC分类号： G01R33/485 , G01R33/5608
摘要： A magnetic resonance imaging system capable of conducting spectroscopic imaging with an improved SNR without degrading the spatial resolution includes edge-preserving filter processing means for spectroscopic imaging. The edge-preserving filter processing means executes processing including the steps of calculating spectral similarity in spatial neighborhoods (spatially neighboring voxels) at each voxel in spectroscopic imaging data, calculating a spectral weight according to the spectral similarity, and conducting weighted smoothing for compounding spectra of spatial neighborhoods (spatially neighboring voxels) according to the spectral weight.
摘要翻译： 能够在不降低空间分辨率的情况下以改善的SNR进行光谱成像的磁共振成像系统包括用于分光成像的边缘保留滤波处理装置。 边缘保留滤波处理装置执行处理，其包括以下步骤：计算分光成像数据中的每个体素的空间邻域（空间相邻体素）中的频谱相似度，根据频谱相似度计算频谱权重，以及进行加权平滑化， 根据光谱权重的空间邻域（空间相邻体素）。
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