公开(公告)号：US5297033A

公开(公告)日：1994-03-22

申请号：US756896

申请日：1991-09-09

申请人： Yoshitaka Bito ,  Kensuke Sekihara ,  Ryuichi Suzuki

发明人： Yoshitaka Bito ,  Kensuke Sekihara ,  Ryuichi Suzuki

IPC分类号： G01R33/54 ,  A61B5/055 ,  G01R33/32 ,  G01R33/565 ,  G06T1/00 ,  G06F15/42 ,  G01R33/20

CPC分类号： G01R33/56545

摘要： This invention relates to a data processing method for suppressing truncation artifacts mixed into two-dimensional images in nuclear magnetic resonance imaging. Two-dimensional measurement data arrays are obtained on a space frequency domain by the combination of phase encoding and a readout gradient magentic field, and a data position providing the greatest value of the one-dimensional data array constituting the two-dimensional measurement data array is obtained in the readout direction so as to estimate the origin of the space frequency axis in the readout direction. A high-pass filter using the estimated origin as a reference is applied to each one-dimensional data array, and data extrapolation is made for each one-dimensional data array to obtain a data array having an expanded region. Nuclear spin images are obtained by inverse Fourier transformation of these data arrays.

摘要翻译： 本发明涉及一种用于抑制核磁共振成像中混入二维图像的截断伪影的数据处理方法。 通过相位编码和读出梯度磁场的组合，在空间频域上获得二维测量数据阵列，提供构成二维测量数据阵列的一维数据阵列的最大值的数据位置是 在读出方向上获得，以便估计沿读出方向的空间频率轴的原点。 将使用估计的原点作为参考的高通滤波器应用于每个一维数据阵列，并且对于每个一维数据阵列进行数据外推以获得具有扩展区域的数据阵列。 核旋转图像通过这些数据阵列的逆傅里叶变换获得。

公开(公告)号：US09194923B2

公开(公告)日：2015-11-24

申请号：US13702652

申请日：2011-06-06

申请人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Yukio Kaneko

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Yukio Kaneko

IPC分类号： G01V3/00 ,  G01R33/341 ,  A61B5/055 ,  G01R33/565 ,  G01R33/54 ,  G01R33/24 ,  G01R33/561

CPC分类号： G01R33/341 ,  A61B5/055 ,  G01R33/246 ,  G01R33/54 ,  G01R33/5612 ,  G01R33/5659

摘要： B1 distribution is calculated in a short time with a high degree of precision, and a high quality image is obtained. In the RF shimming for irradiating electromagnetic waves using an RF coil having multiple channels, the absolute values of subtraction images between multiple reconstructed images are used to calculate a transmitting sensitivity distribution which is necessary for calculating inter-channel phase difference and amplitude ratio of RF pulses provided to the respective channels. Those multiple reconstructed images are obtained by executing the imaging sequence after applying a prepulse at different flip angles respectively. Assuming an image obtained with a minimum flip angle as a reference image, for instance, the subtraction images are created between the reference image and the other respective images. It is also possible that multiple subtraction images being obtained are divided by one another, and the transmitting sensitivity distribution is created on the basis of the division result.

摘要翻译： 在短时间内以高精度计算B1分布，并且获得高质量图像。 在使用具有多个通道的RF线圈照射电磁波的RF匀场中，使用多个重构图像之间的减影图像的绝对值来计算发射灵敏度分布，这是计算RF脉冲之间的信道间相位差和幅度比所必需的 提供给相应的通道。 通过在分别施加不同翻转角的前脉冲之后执行成像序列来获得这些多重重构图像。 假设以最小翻转角获得的图像作为参考图像，例如，在参考图像和其它各个图像之间产生减法图像。 获得的多个减影图像也可以彼此分割，并且基于分割结果创建发送灵敏度分布。

公开(公告)号：US09097778B2

公开(公告)日：2015-08-04

申请号：US13140484

申请日：2010-02-03

申请人： Yoshitaka Bito ,  Satoshi Hirata ,  Hisaaki Ochi ,  Koji Hirata ,  Toru Shirai ,  Yosuke Otake

发明人： Yoshitaka Bito ,  Satoshi Hirata ,  Hisaaki Ochi ,  Koji Hirata ,  Toru Shirai ,  Yosuke Otake

IPC分类号： G01R33/485 ,  G01R33/563

CPC分类号： G01R33/485 ,  G01R33/56341

摘要： In the diffusion spectroscopic imaging, in which intensity of molecular diffusion is imaged with separating chemical substances, with suppressing artifacts resulting from object motion of an object, spatial resolution, spectral band and SNR are maintained, and measurement accuracy is enhanced. A measurement for acquiring diffusion SI data is repeated a plurality of times with changing acquisition timing, phase variation of each measurement result is corrected, and a diffusion SI image is reconstructed from the corrected measurement results. In addition, the phase variation is calculated for every point in the space from the diffusion SI data acquired by each measurement or navigation data obtained by each measurement. The phase correction is independently performed for every point in the space.

摘要翻译： 在通过分离化学物质成像分子扩散强度的扩散光谱成像中，通过抑制由物体的物体运动产生的伪影，保持了空间分辨率，光谱带和SNR，并且提高了测量精度。 通过改变获取定时多次重复获取扩散SI数据的测量，校正每个测量结果的相位变化，并从校正的测量结果重建扩散SI图像。 此外，根据通过各测量获得的扩散SI数据或通过每次测量获得的导航数据，计算空间中每个点的相位变化。 对于空间中的每一个点都独立执行相位校正。

公开(公告)号：US08787639B2

公开(公告)日：2014-07-22

申请号：US13577355

申请日：2011-01-28

申请人： Toru Shirai ,  Yoshitaka Bito

发明人： Toru Shirai ,  Yoshitaka Bito

IPC分类号： G06K9/00

CPC分类号： G01R33/4828 ,  A61B5/055 ,  A61B5/4869 ,  A61B5/4872

摘要： Water/fat separation imaging is performed by an MRI device, even if the measurement is not performed with such echo times that the phases of water and fat signals become in-phase or out-of-phase. A determination is made as to which of two obtained separation images is a water image or a fat image. Two water/fat ratio maps are calculated from two original images obtained with such two echo times that phase differences of water and fat signals do not become positive and negative values, and do not becomes integral multiples of π. Two phase maps are calculated from the two water/fat ratio maps and are combined to calculate two minimum phase difference maps showing minimum spatial phase difference. From dispersion in differential maps obtained by spatially differentiating the minimum phase difference maps, a correct minimum phase difference map is determined, and is used to perform phase correction of the original image.

摘要翻译： 水分/脂肪分离成像由MRI装置进行，即使不进行水分和脂肪信号的相位成为同相或异相的回波时间的测量。 确定两个获得的分离图像中的哪一个是水图像或胖图像。 从两个回波时间获得的两个原始图像计算出两个水/脂肪比例图，其中水分和脂肪信号的相位差不会变为正值和负值，并不成为＆pgr的整数倍。 两个相位图由两个水/脂肪比图计算，并被组合以计算显示最小空间相位差的两个最小相位差图。 从通过空间微分最小相位差图获得的差分图中的色散，确定正确的最小相位差图，并用于执行原始图像的相位校正。

公开(公告)号：US08587310B2

公开(公告)日：2013-11-19

申请号：US13054155

申请日：2009-07-22

申请人： Yo Taniguchi ,  Yoshitaka Bito ,  Shoichi Miyawaki ,  Hiroyuki Takeuchi ,  Suguru Yokosawa

发明人： Yo Taniguchi ,  Yoshitaka Bito ,  Shoichi Miyawaki ,  Hiroyuki Takeuchi ,  Suguru Yokosawa

IPC分类号： G01V3/00

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。

公开(公告)号：US20130082708A1

公开(公告)日：2013-04-04

申请号：US13702652

申请日：2011-06-06

申请人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Yukio Kaneko

发明人： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Yukio Kaneko

IPC分类号： G01R33/341 ,  G01R33/54

CPC分类号： G01R33/341 ,  A61B5/055 ,  G01R33/246 ,  G01R33/54 ,  G01R33/5612 ,  G01R33/5659

摘要： B1 distribution is calculated in a short time with a high degree of precision, and a high quality image is obtained. In the RF shimming for irradiating electromagnetic waves using an RF coil having multiple channels, the absolute values of subtraction images between multiple reconstructed images are used to calculate a transmitting sensitivity distribution which is necessary for calculating inter-channel phase difference and amplitude ratio of RF pulses provided to the respective channels. Those multiple reconstructed images are obtained by executing the imaging sequence after applying a prepulse at different flip angles respectively. Assuming an image obtained with a minimum flip angle as a reference image, for instance, the subtraction images are created between the reference image and the other respective images. It is also possible that multiple subtraction images being obtained are divided by one another, and the transmitting sensitivity distribution is created on the basis of the division result.

摘要翻译： 在短时间内以高精度计算B1分布，并且获得高质量图像。 在使用具有多个通道的RF线圈照射电磁波的RF匀场中，使用多个重构图像之间的减影图像的绝对值来计算发射灵敏度分布，这是计算信道间相位差和RF脉冲幅度比所必需的 提供给相应的通道。 通过在分别施加不同翻转角的前脉冲之后执行成像序列来获得这些多重重构图像。 假设以最小翻转角获得的图像作为参考图像，例如，在参考图像和其它各个图像之间产生减法图像。 获得的多个减影图像也可以彼此分割，并且基于分割结果创建发送灵敏度分布。

公开(公告)号：US20130057285A1

公开(公告)日：2013-03-07

申请号：US13697122

申请日：2011-05-02

申请人： Satoshi Hirata ,  Yoshitaka Bito

发明人： Satoshi Hirata ,  Yoshitaka Bito

IPC分类号： G01R33/38

CPC分类号： G01R33/485 ,  G01R33/4833 ,  G01R33/5607 ,  G01R33/5617

摘要： An object of the present invention is to provide a measuring technique which allows in the MRS measurement to suppress with a high degree of precision, incorporation of a signal of unwanted compounds which hinders measurement of a measurement object signal, independent of an imaging object region and the measurement object signal, thereby obtaining a stable and favorable signal spectrum. In the MRS measuring sequence, a spectrum selective inversion RF pulse, having a narrow band characteristic for selectively inverting only a signal peak of a compounds to be suppressed, and phase dispersion-refocusing GC pulses are applied at least one of before and after a region selective RF pulse. This MRS measuring sequence is repeated while changing the echo time TE at predetermined intervals, and nuclear magnetic resonance signals being obtained by the repetition are integrated. The amount of the spectrum selective inversion RF pulse to be applied may be changed according to the echo time TE.

摘要翻译： 本发明的目的是提供一种测量技术，其允许在MRS测量中以高精确度抑制，不依赖于成像对象区域而引入妨碍测量对象信号的测量的不想要的化合物的信号，以及 测量对象信号，从而获得稳定和有利的信号频谱。 在MRS测量序列中，具有用于选择性地仅反转待抑制的化合物的信号峰的窄带特性和相位色散重新聚焦GC脉冲的频谱选择性反转RF脉冲施加在区域之前和之后的至少一个 选择性RF脉冲。 在以预定间隔改变回波时间TE的同时重复该MRS测量序列，并且通过重复获得的核磁共振信号被积分。 可以根据回波时间TE改变要施加的频谱选择性反转RF脉冲的量。

公开(公告)号：US20130049753A1

公开(公告)日：2013-02-28

申请号：US13642573

申请日：2011-04-20

申请人： Yo Taniguchi ,  Yoshitaka Bito ,  Tetsuhiko Takahashi ,  Takenori Murase

发明人： Yo Taniguchi ,  Yoshitaka Bito ,  Tetsuhiko Takahashi ,  Takenori Murase

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。

公开(公告)号：US08258785B2

公开(公告)日：2012-09-04

申请号：US12523259

申请日：2007-12-17

申请人： Satoshi Hirata ,  Yoshitaka Bito ,  Kiyoharu Tanaka

发明人： Satoshi Hirata ,  Yoshitaka Bito ,  Kiyoharu Tanaka

IPC分类号： G01V3/00

CPC分类号： A61B5/055 ,  A61B5/7257

摘要： An object of the invention is to obtain a magnetic resonance spectroscopic image to which the MAC summation is applied with high accuracy and in short time, even though a phase characteristic distribution of the MAC has a spatial non-uniformity, in the MRSI measurement using a magnetic resonance imaging apparatus provided with a MAC. Using a non-water-suppressed image signal with high SNR, obtained in the non-water-suppressed measurement (a reference measurement) without water suppression, a correction value for correcting the phase distortion for the MAC summation is calculated on each pixel in each coil. After correcting a phase on each pixel in each coil of a main-scan image signal measured under suppressing water (water-suppressed image signal) using the corrective value, signal adding operation (summation) is performed. Then, a phase correction in a spectrum-axis is to be performed on the summed spectrum signal.

摘要翻译： 本发明的目的在于，即使在MAC的相位特性分布具有空间不均匀性的情况下，也能够在短时间内以高精度和短时间获得应用了MAC求和的磁共振分光图像， 具有MAC的磁共振成像装置。 使用在没有水分抑制的非水抑制测量（参考测量）中获得的具有高SNR的非水分抑制图像信号，针对每个像素计算用于校正MAC求和的相位失真的校正值 线圈 在使用校正值校正在用抑制水（水分抑制图像信号）测量的主扫描图像信号的每个线圈中的每个像素上的相位之后，执行信号相加操作（求和）。 然后，对相加的频谱信号进行频谱轴的相位校正。

公开(公告)号：US08030924B2

公开(公告)日：2011-10-04

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： G01V3/00

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）。