公开(公告)号：US06940280B2

公开(公告)日：2005-09-06

申请号：US10123329

申请日：2002-04-16

申请人： Kenji Asano ,  Susumu Kosugi

发明人： Kenji Asano ,  Susumu Kosugi

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/561 ,  G01V3/00

CPC分类号： G01R33/561

摘要： To reduce artifacts caused by sudden change of a phase encode amount, data Hj, Mj, and Lj having a large phase encode amount are collected, and then, when collecting data C3j-4, C3j-3, and C3j-2 having a small phase encode amount, a buffer pulse sequence having an intermediate phase encode amount (+9) or (+49) is inserted one or more times between both.

摘要翻译： 为了减少由相位编码量的突然改变引起的伪像，收集具有大的相位编码量的数据Hj，Mj和Lj，然后，当收集数据C 3j-4时，C _{和3_3-2 ，具有中间相位编码量（+9）或（+49）的缓冲脉冲序列被插入一个 或更多次。}

公开(公告)号：US06771069B2

公开(公告)日：2004-08-03

申请号：US10191948

申请日：2002-07-09

申请人： Kenji Asano ,  Susumu Kosugi

发明人： Kenji Asano ,  Susumu Kosugi

IPC分类号： G01V300

CPC分类号： G01R33/5615 ,  G01R33/5617

摘要： The present invention aims at making it possible to successfully achieve fast recovery during magnetic resonance imaging in which the fast spin echo technique combined with the inversion recovery technique is implemented. A 180° x pulse is applied in order to excite spins. Thereafter, when an inversion time TI has elapsed, a 90° x pulse is applied in order to excite the spins. Thereafter, when a half of a time esp has elapsed, a 180° y pulse is applied in order to excite the spins. Thereafter, when the time esp has elapsed, the 180° y pulse is applied an odd number of times in order to sequentially excite the spins. Thereafter, when a half of the time esp has elapsed, the 90° x pulse is applied in order to excite the spins.

摘要翻译： 本发明的目的在于可以在实现与反转恢复技术相结合的快速自旋回波技术的磁共振成像期间成功实现快速恢复。 施加180°x脉冲以激发旋转。 此后，当经过反转时间TI时，施加90°x脉冲以激发自旋。 此后，当经过一半时间esp时，施加180°y的脉冲以激发自旋。 此后，当时间esp过去时，180°y脉冲被施加奇数次，以顺序地激发自旋。 此后，当经过一半的时间esp时，施加90°x脉冲以激发自旋。

公开(公告)号：US06737865B2

公开(公告)日：2004-05-18

申请号：US10370253

申请日：2003-02-20

申请人： Kenji Asano ,  Susumu Kosugi

发明人： Kenji Asano ,  Susumu Kosugi

IPC分类号： G01V300

CPC分类号： G01R33/56563 ,  G01R33/387 ,  G01R33/56518

摘要： For the purpose of thoroughly reducing the effect of residual magnetization caused by gradient pulses, the strength of a phase rewinding gradient is made half or about half of that of a phase encoding gradient; the strength of a slice rewinding gradient is made half or about half of that of a slice encoding gradient; a killer gradient having an intensity equal to that of the slice selective gradient is applied to the slice axis; and a killer gradient having an intensity equal to that of a readout gradient is applied to the frequency axis subsequent to the readout gradient.

摘要翻译： 为了彻底降低由梯度脉冲引起的剩余磁化的影响，相位重绕梯度的强度为相位编码梯度的一半或约一半; 切片倒带梯度的强度是切片编码梯度的一半或约一半; 具有强度等于切片选择性梯度强度的杀手梯度被施加到切片轴; 并且具有等于读出梯度的强度的杀伤梯度被施加到读出梯度之后的频率轴上。

公开(公告)号：US06814280B2

公开(公告)日：2004-11-09

申请号：US10372063

申请日：2003-02-21

申请人： Mitsuharu Miyoshi ,  Susumu Kosugi

发明人： Mitsuharu Miyoshi ,  Susumu Kosugi

IPC分类号： G01V300

CPC分类号： G01R33/56308

摘要： For the purpose of reducing degradation of image quality due to attenuation of signal intensity, or satisfactorily rendering blood flow even when fast blood flow and slow blood flow are simultaneously present in an imaged region, an imaged region A is divided into a plurality of adjacent slabs; RF pulses are transmitted with a flip angle profile whose flip angle &agr; varies with respect to the thickness direction in each of the slabs and whose average flip angle differs for each of the slabs, to collect NMR signals; and blood flow imaging is conducted based on the NMR signals.

公开(公告)号：US06407549B1

公开(公告)日：2002-06-18

申请号：US09902312

申请日：2001-07-10

申请人： Nozomu Uetake ,  Susumu Kosugi

发明人： Nozomu Uetake ,  Susumu Kosugi

IPC分类号： G01V300

CPC分类号： G01R33/54

摘要： For the purpose of increasing the time available for performing a calculation on a navigator echo, the sampling frequency for a navigator echo is made higher than the sampling frequency for an imaging echo, or the number of sampling points for the navigator echo is made fewer than the number of sampling points for the imaging echo, or both measures are implemented in combination.

摘要翻译： 为了增加可用于在导航回波上执行计算的时间，使导航回波的采样频率高于成像回波的采样频率，或导航回波的采样点的数量少于 用于成像回波的采样点的数量或两个测量值的组合实现。

公开(公告)号：US5497088A

公开(公告)日：1996-03-05

申请号：US318800

申请日：1994-10-14

申请人： Yuichi Hayano ,  Susumu Kosugi

发明人： Yuichi Hayano ,  Susumu Kosugi

IPC分类号： A61B5/055 ,  G01R33/48 ,  G01R33/561 ,  G01R33/565 ,  G01V3/14

CPC分类号： G01R33/56554 ,  G01R33/5615 ,  G01R33/5617

摘要： An object of the present invention is to eliminate the bad effect on the image quality caused by the production of a sharp difference in signal strength at the DC view due to the T2 relaxation and to prevent the contrast of the MRI image from becoming a mixture of different multiple contrasts. The DC view is shifted to become a view virtually in the middle of one block by adding an offset phase gradient amount to each phase gradient and, further, the low-frequency region is arranged to be contained in one block.

摘要翻译： PCT No.PCT / JP93 / 00645 Sec。 371日期：1994年10月14日 102（e）日期1994年10月14日PCT提交1993年5月17日PCT公布。 公开号WO93 / 22967 日期：1月25日，1993。本发明的一个目的是消除由于T2弛豫而产生由DC产生的信号强度差异引起的图像质量的不良影响，并且防止了 MRI图像成为不同多重对比的混合物。 通过向每个相位梯度添加偏移相位梯度量，将DC视图移动成实际上在一个块的中间的视图，此外，低频区域被布置成包含在一个块中。

公开(公告)号：US5089784A

公开(公告)日：1992-02-18

申请号：US499449

申请日：1990-06-22

申请人： Eiji Yoshitome ,  Susumu Kosugi

发明人： Eiji Yoshitome ,  Susumu Kosugi

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/54 ,  G01R33/56

CPC分类号： G01R33/4833 ,  G01R33/56

摘要： The method for restricting a region for magnetic resonance imaging, in accordance with the present invention, comprisinga step of measuring a spin-echo signal from an object by a pulse sequence of Fourier transformation technique;a step of measuring a spin-echo signal from an object by a pulse sequence comprising adding a selective 180.degree..+-.x pulse and a selective 180.degree..+-.y pulse following a 180.degree. pulse in the pulse sequence of Fourier transform technique, the integral of gradient magnetic fields for selection thereof being 0; anda step of reconstructing an image from the addition or subtraction between the spin-echo signals measured by the two sequences.

公开(公告)号：US6154029A

公开(公告)日：2000-11-28

申请号：US286642

申请日：1999-04-02

申请人： Shoei Miyamoto ,  Susumu Kosugi

发明人： Shoei Miyamoto ,  Susumu Kosugi

IPC分类号： G01R33/48 ,  A61B5/055 ,  G01R33/561 ,  G01R33/565 ,  G01V3/00

CPC分类号： G01R33/56554 ,  G01R33/5615 ,  G01R33/5617

摘要： In order to reduce ghosts due to increasing echo intensity fall-off in the course of an echo train in MR imaging employing the FSE method, the present method assigns individual echoes in the echo train to respective segments to acquire data F(S1-S3), then assigns individual echoes arranged in the reverse order to the respective segments so that the order of signal intensity magnitude in the data F is inverted, to acquire data R(S4-S5), adds the data F and R for each view, and produces an image from the sum data. The number of echoes in the echo train is preferably selected to be an even number.

摘要翻译： 为了减少在使用FSE方法的MR成像中的回波串训练过程中增加的回波强度下降的鬼影，本方法将回波序列中的各个回波分配给各个段，以获得数据F（S1-S3） ，然后将以相反顺序排列的各个回波分配给相应的段，使得数据F中的信号强度幅度的顺序被反转，以获取数据R（S4-S5），为每个视图添加数据F和R，以及 从和数据生成图像。 回波串中的回波数优选地选择为偶数。

公开(公告)号：US4894616A

公开(公告)日：1990-01-16

申请号：US251213

申请日：1988-09-27

申请人： Eiji Yoshitome ,  Kazuya Hoshino ,  Susumu Kosugi

发明人： Eiji Yoshitome ,  Kazuya Hoshino ,  Susumu Kosugi

IPC分类号： A61B10/00 ,  A61B5/055 ,  G01R33/48 ,  G01R33/483

CPC分类号： G01R33/4838

摘要： An improved selective excitation method applicable to NMR imaging, regardless of the NMR signal generation method used, wherein a non-scanned subject area is excited using an RF signal, then the excited area is spoiled with a gradient magnetic field to create an area that receives no other excitation RF signal for a set period, and then NMR signals are collected from the unspoiled area using a conventional method.

公开(公告)号：US07336986B2

公开(公告)日：2008-02-26

申请号：US10672662

申请日：2003-09-26

申请人： Mitsuharu Miyoshi ,  Susumu Kosugi

发明人： Mitsuharu Miyoshi ,  Susumu Kosugi

IPC分类号： A61B5/05 ,  A61B19/00 ,  G01V3/00

CPC分类号： G01R33/4828 ,  G01R33/5613

摘要： An apparatus includes acquiring means for acquiring echo data of a plurality of views in which a phase difference between water and fat is 2π/m with spins within a subject brought to the SSFP state and repeating the acquisition for k=0 through M−1 with a step difference in a phase of an RF pulse of 2π·k/M; transforming means for conducting Fourier transformation on the echo data based on the phase step difference; separating means for separating water data and fat data respectively in F(0) term and F(1) term of the Fourier-transformed data using the phase difference between water and fat; adding means for obtaining a sum of absolute values of at least the water data or fat data in the F(0) term and F(1) term; and image producing means for producing an image based on the sum data.

摘要翻译： 一种装置，包括获取装置，用于获取多个视图中的回波数据，其中水和脂肪之间的相位差为2pi / m，与被摄体内的自旋进入SSFP状态，重复k = 0至M-1的采集， RF脉冲的相位差为2pi.k / M; 变换装置，用于基于相位差差对回波数据进行傅里叶变换; 分离装置，用于使用水和脂肪之间的相位差分别在傅立叶变换数据的F（0）项和F（1）项中分离水数据和脂肪数据; 添加用于获得F（0）项和F（1）项中的至少水分数据或脂肪数据的绝对值之和的装置; 以及图像产生装置，用于基于总和数据产生图像。