公开(公告)号：US09198599B2

公开(公告)日：2015-12-01

申请号：US13642573

申请日：2011-04-20

Applicant: Yo Taniguchi ,  Yoshitaka Bito ,  Tetsuhiko Takahashi ,  Takenori Murase

Inventor： Yo Taniguchi ,  Yoshitaka Bito ,  Tetsuhiko Takahashi ,  Takenori Murase

IPC: A61B5/055 ,  G01R33/56 ,  G01R33/561 ,  A61B5/00 ,  G06T5/00

CPC classification number: A61B5/055 ,  A61B5/0042 ,  A61B2576/026 ,  G01R33/5608 ,  G01R33/5613 ,  G06T5/009 ,  G06T2207/10088

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08614574B2

公开(公告)日：2013-12-24

申请号：US12993905

申请日：2009-05-22

Applicant: Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Hiroyuki Itagaki

Inventor： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito ,  Hiroyuki Itagaki

IPC: G01V3/00 ,  A61B5/05 ,  G01R33/48

CPC classification number: A61B5/055 ,  A61B5/7285 ,  A61B5/7289 ,  A61B5/7292 ,  G01R33/288 ,  G01R33/543 ,  G01R33/5614 ,  G01R33/56325 ,  G01R33/5635

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US08188739B2

公开(公告)日：2012-05-29

申请号：US12519197

申请日：2007-06-29

Applicant: Toru Shirai ,  Yoshitaka Bito ,  Yo Taniguchi ,  Satoshi Hirata

Inventor： Toru Shirai ,  Yoshitaka Bito ,  Yo Taniguchi ,  Satoshi Hirata

IPC: G01V3/00

CPC classification number: G01R33/485 ,  G01R33/483 ,  G01R33/5602 ,  G01R33/5607

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20120093385A1

公开(公告)日：2012-04-19

申请号：US13380201

申请日：2010-06-22

Applicant: Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito

Inventor： Suguru Yokosawa ,  Yo Taniguchi ,  Yoshitaka Bito

IPC: G06K9/62

CPC classification number: A61B5/055 ,  A61B5/0037 ,  A61B5/0042 ,  A61B5/4528 ,  A61B5/4533 ,  A61B2576/026 ,  G01R33/4833 ,  G01R33/543 ,  G01R33/546

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US07868618B2

公开(公告)日：2011-01-11

申请号：US12308186

申请日：2007-06-12

Applicant: Yo Taniguchi ,  Hisaaki Ochi

Inventor： Yo Taniguchi ,  Hisaaki Ochi

IPC: G01V3/00

CPC classification number: G01R33/5613 ,  A61B5/055 ,  G01R33/543 ,  G01R33/586

Abstract: The MRI apparatus of the present invention executes a non-imaging mode 501 for obtaining a steady state of magnetization and an imaging mode 502 for measuring echoes for images. In the non-imaging mode 501 and the imaging mode 502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode 502 is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode 502 is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.

Abstract translation: 本发明的MRI装置执行用于获得稳定的磁化状态的非成像模式501和用于测量图像的回波的成像模式502。 在非成像模式501和成像模式502中，通过使用GrE型脉冲序列进行成像。 在成像中，照射成像模式502中的核磁化的翻转角的RF脉冲在不大于由非成像模式502中使用的核磁化的翻转角确定的某个值的范围内变化的范围内。 该特定值例如是在非成像模式中使用的核磁化的翻转角的最大值或由在非成像模式结束时使用的RF脉冲提供的翻转角。 可以通过使用GrE型脉冲序列观察到的SAR，而不会降低图像对比度，从而可以降低对人体的影响。

公开(公告)号：US07701214B2

公开(公告)日：2010-04-20

申请号：US11912763

申请日：2006-02-23

Applicant: Shinji Kurokawa ,  Yo Taniguchi ,  Hisaaki Ochi ,  Shin-ichiro Umemura

Inventor： Shinji Kurokawa ,  Yo Taniguchi ,  Hisaaki Ochi ,  Shin-ichiro Umemura

IPC: G01V3/00

CPC classification number: G01R33/56375 ,  G01R33/56383

Abstract: When a magnetic resonance signal is received more than once, while a table (transfer unit) is moved, a gradient magnetic field is applied in the table moving direction, and an application amount (intensity and application time) of the gradient magnetic field in the table moving direction is changed every acquisition of data. As for the encoding by the gradient magnetic field in the table moving direction, a series of phase encode is performed at different positions of an examination target, unlike a conventional phase encode. Therefore, the Fourier transform cannot be applied to the image reconstruction. Given this situation, a magnetization map of total FOV of the examination target is determined in such a manner that a sum of the square of an absolute value of a difference is minimized, the difference between a received signal and a signal calculated from the magnetization map set as a variable, and then, the reconstruction is performed. Even when a size of signal acquisition area in the table moving direction is narrow, the magnetic resonance imaging apparatus of the present invention is capable of taking an image of a wide field of view at high speed, by performing the imaging while the table is moved continuously.

Abstract translation: 当多次接收到磁共振信号时，在移动台（传送单元）的同时，在台移动方向上施加梯度磁场，并且在梯形磁场的施加量（强度和施加时间） 每次采集数据时，表移动方向都会发生变化。 对于表移动方向的梯度磁场的编码，与现有的相位编码不同，在检查对象的不同位置进行一系列的相位编码。 因此，傅里叶变换不能应用于图像重构。 考虑到这种情况，检测对象的总FOV的磁化映射以如下方式来确定，使得差的绝对值的平方和之和最小化，接收信号与从磁化映射计算的信号之间的差 设置为变量，然后进行重建。 即使当表移动方向上的信号获取区域的尺寸窄时，本发明的磁共振成像装置也能够通过在桌子移动时进行成像而以高速拍摄宽视野的图像 不断地

公开(公告)号：US20090251142A1

公开(公告)日：2009-10-08

申请号：US12308186

申请日：2007-06-12

Applicant: Yo Taniguchi ,  Hisaaki Ochi

Inventor： Yo Taniguchi ,  Hisaaki Ochi

IPC: G01R33/54 ,  G01R33/28

CPC classification number: G01R33/5613 ,  A61B5/055 ,  G01R33/543 ,  G01R33/586

Abstract: The MRI apparatus of the present invention executes a non-imaging mode 501 for obtaining a steady state of magnetization and an imaging mode 502 for measuring echoes for images. In the non-imaging mode 501 and the imaging mode 502, imaging is performed by using a GrE type pulse sequence. In the imaging, RF pulses are irradiated while flip angle of nuclear magnetization in the imaging mode 502 is changed in a range of values not larger than a certain value determined by flip angle of nuclear magnetization used in the non-imaging mode 502 is irradiated. This certain value is, for example, the maximum value of flip angle of nuclear magnetization used in the non-imaging mode, or flip angle provided by an RF pulse used at the end of the non-imaging mode. SAR observed with use of a GrE type pulse sequence can be thereby reduced without degrading image contrast, and thus influence on human bodies can be reduced.

Abstract translation: 本发明的MRI装置执行用于获得稳定的磁化状态的非成像模式501和用于测量图像的回波的成像模式502。 在非成像模式501和成像模式502中，通过使用GrE型脉冲序列进行成像。 在成像中，照射成像模式502中的核磁化的翻转角的RF脉冲在不大于由非成像模式502中使用的核磁化的翻转角确定的某个值的范围内变化的范围内。 该特定值例如是在非成像模式中使用的核磁化的翻转角的最大值或由在非成像模式结束时使用的RF脉冲提供的翻转角。 可以通过使用GrE型脉冲序列观察到的SAR，而不会降低图像对比度，从而可以降低对人体的影响。

公开(公告)号：US20080009703A1

公开(公告)日：2008-01-10

申请号：US11797878

申请日：2007-05-08

Applicant: Yoshitaka Bito ,  Hisaaki Ochi ,  Yo Taniguchi ,  Satoshi Hirata ,  Toru Shirai

Inventor： Yoshitaka Bito ,  Hisaaki Ochi ,  Yo Taniguchi ,  Satoshi Hirata ,  Toru Shirai

IPC: A61B5/05

CPC classification number: G01R33/485 ,  G01R33/5608

Abstract: 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.

Abstract translation: 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）。

公开(公告)号：US06876201B2

公开(公告)日：2005-04-05

申请号：US10468963

申请日：2002-02-25

Applicant: Masahiro Takizawa ,  Tetsuhiko Takahashi ,  Hisaaki Ochi ,  Yo Taniguchi

Inventor： Masahiro Takizawa ,  Tetsuhiko Takahashi ,  Hisaaki Ochi ,  Yo Taniguchi

IPC: G01R33/3415 ,  G01R33/561 ,  G01V3/00

CPC classification number: G01R33/5611 ,  G01R33/3415

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US5789922A

公开(公告)日：1998-08-04

申请号：US645478

申请日：1996-05-13

Applicant: Hisaaki Ochi ,  Etsuji Yamamoto ,  Yo Taniguchi

Inventor： Hisaaki Ochi ,  Etsuji Yamamoto ,  Yo Taniguchi

IPC: G01R33/46 ,  A61B5/055 ,  G01R33/48 ,  G01R33/561

CPC classification number: G01R33/446 ,  G01R33/5615

Abstract: In an inspecting method based on nuclear magnetic resonance, a burst wave having a plurality of sub-pulses frequency-modulated with a high frequency is generated, the burst wave is amplitude-modulated with at least a function which repeats polarity inversion, the amplitude-modulated burst wave is irradiated, as an exciting high frequency pulse, to an object to be inspected, and gradient magnetic fields are generated in predetermined pulse sequence to measure a nuclear magnetic resonance signal.

Abstract translation: 在基于核磁共振的检查方法中，产生具有高频率频率调制的多个子脉冲的脉冲波，突发波被至少以重复极性反转的功能进行幅度调制， 作为激励高频脉冲将调制脉冲波照射到要检查的物体，并且以预定脉冲序列产生梯度磁场以测量核磁共振信号。