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1. 发明授权

EP0735379B1 MRI apparatus 失效
标题翻译： MRI设备
公开(公告)号：EP0735379B1
公开(公告)日：2003-11-12
申请号：EP96104442.7
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563

2. 发明公开

EP1103820A1 MRI apparatus 失效
标题翻译： MRI-Gerät
公开(公告)号：EP1103820A1
公开(公告)日：2001-05-30
申请号：EP01104752.9
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563
摘要： The present invention relates to an MRI apparatus capable of preventing the quality of an image from being degraded under the influence of eddy currents and residual magnetization caused by a phase encode gradient. While an RF pulse P1 is sent, a phase encode gradient gy(i) is applied to a warp axis and a read gradient rr is applied to a read axis, an NMR signal is received, followed by application of a rewind gradient gyr(i)' to the warp axis. The rewind gradient gyr(i)' is defined as "(a basic component of opposite polarity equal in time integral value to the phase encode gradient gy(i)) + (a warp-axis correction component for correcting the influence of eddy currents or residual magnetization caused by the phase encode gradient gy(i))".
摘要翻译：本发明涉及一种MRI装置，能够防止图像的质量在由相位编码梯度引起的涡流和残余磁化的影响下劣化。当发送RF脉冲P1时，将相位编码梯度gy（i）施加到翘曲轴，读取梯度rr被施加到读取轴，接收NMR信号，随后应用倒带梯度gyr（i ）'到经轴。反绕梯度gyr（i）'定义为“（相位极性相对于相位编码梯度gy（i）的时间积分值相等的基本分量）+（用于校正涡流的影响的经向轴校正分量或由相位编码梯度gy（i）引起的剩余磁化）“。

3. 发明授权

EP1103819B1 MRI apparatus 失效
标题翻译： MRI机
公开(公告)号：EP1103819B1
公开(公告)日：2007-08-08
申请号：EP01104751.1
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563

4. 发明授权

EP1115006B1 MRI apparatus 失效
标题翻译： MRI机
公开(公告)号：EP1115006B1
公开(公告)日：2006-07-26
申请号：EP01104749.5
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563

5. 发明公开

EP1067394A3 Partially shielded gradient coil assembly for MRI apparatus 审中-公开
标题翻译：用于成像的磁共振的设备Teilabgeschirmte梯度线圈组件
公开(公告)号：EP1067394A3
公开(公告)日：2002-04-24
申请号：EP00305132.3
申请日：2000-06-16
申请人： GE Yokogawa Medical Systems Ltd.
发明人： Goto, Takao
IPC分类号： G01R33/421
CPC分类号： G01R33/4215
摘要： In order to reduce the electric current loss and the heat release in a shielding coil, partially shielding coils 1Zts and 1Zbs are employed having their windings positioned corresponding only to a high winding density zone 1Zp, rather than corresponding to the entire winding area, of main gradient coils 1Zt and 1Zb.

6. 发明公开

EP1115006A3 MRI apparatus 失效
公开(公告)号：EP1115006A3
公开(公告)日：2001-08-01
申请号：EP01104749.5
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563
摘要： The present invention relates to an MRI apparatus capable of preventing the quality of an image from being degraded under the influence of eddy currents and residual magnetization caused by a phase encode gradient. While an RF pulse P1 is sent, a phase encode gradient gy(i) is applied to a warp axis and a read gradient rr is applied to a read axis, an NMR signal is received, followed by application of a rewind gradient gyr(i)' to the warp axis. The rewind gradient gyr(i)' is defined as "(a basic component of opposite polarity equal in time integral value to the phase encode gradient gy(i)) + (a warp-axis correction component for correcting the influence of eddy currents or residual magnetization caused by the phase encode gradient gy(i))".

7. 发明公开

EP0818689A1 MRI method of phase shift measurement, MRI method of phase shift correction, and MRI apparatus carrying out these methods 失效
标题翻译：在图像形成磁共振测定的相移，用于校正由磁共振成像的相移和装置，该装置执行该处理的方法
公开(公告)号：EP0818689A1
公开(公告)日：1998-01-14
申请号：EP97305106.3
申请日：1997-07-10
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56518 , G01R33/56563
摘要： For the accurate measurement of the phase shift of echos caused by the inference of the eddy current and residual magnetization attributable to the encode gradient and the like, the measuring process includes the steps of emitting an excitation pulse R, emitting an inversion pulse Pl, applying an encode gradient gyn to the phase axis, applying a read gradient gxr, which is the former half of the usual read gradient, to the read axis, applying a rewind gradient gyrn in which a compensation pulse gypn is put to the phase axis, emitting an inversion pulse P2, applying a dephaser gradient gywdn to the phase axis, sampling data from the echo2 while applying a readout gradient gywn to the phase axis, evaluating the phase shift value of the echo2 caused by the influence of the encode gradient gyn and rewind gradient gyrn based on phase data resulting from the first-order Fourier transform for the sampled data, determining the correction value from the resulting phase shift value, revising the compensation pulse gypn with the correction value, and repeatting these operations an intended number of times while altering the encode gradient gyn.
摘要翻译：对于由涡流和剩磁的推理引起回波相移的精确测量属性能够在编码梯度之类的，在测量过程包括发射在激励脉冲R的步骤，发射在反相脉冲PL，施加有助于梯度曲线gyn编码在相位轴上，施加读梯度曲线GXR，所有后者是前者的通常读梯度在读轴上的，施加回绕梯度曲线Gyrn在哪一个补偿脉冲gypn放置在相位轴上，发光到反相脉冲P2，施加相差梯度曲线gywdn在相位轴上，而施加读出梯度曲线gywn在相位轴上对echo2进行数据采样，评估由编码梯度曲线gyn和回绕的影响引起的对echo2的相移值基于相位数据从所述一阶富里埃变换所得到的取样数据梯度Gyrn，确定性的采矿从所得的相移值的修正值，修改补偿脉冲gypn与校正值，并且重复开始合成操作的次数预期数量而改变编码梯度曲线gyn。

8. 发明公开

EP1063533A3 Method of manufacturing an MRI gradient coil 审中-公开
标题翻译：一种制造梯度线圈的磁共振成像的方法
公开(公告)号：EP1063533A3
公开(公告)日：2002-05-22
申请号：EP00304859.2
申请日：2000-06-08
申请人： GE Yokogawa Medical Systems Ltd.
发明人： Goto, Takao , Inoue, Yuji
IPC分类号： G01R33/34 , G01R33/385
CPC分类号： G01R33/385 , Y10T29/4902
摘要： In order to obtain good linearity without reducing efficiency in generating a magnetic field, a winding pattern of one semicircular spiral is assumed; an electric current distribution is expressed by a continuous function J x (x) such that an x-axis electric current distribution profile does not lie in both the positive and negative polarities; parameters of the continuous function J x (x) are optimized so that desired linearity can be obtained; and a position of a straight-line portion 1Xt1L of the semicircular spiral is determined so that the electric current distribution profile given by the optimized continuous function J x (x) is fulfilled. The resulting pattern is symmetrically duplicated to generate a gradient coil unit 1Xt, and a plurality of the gradient coil units 1Xt are combined to form a gradient coil.

9. 发明公开

EP1115007A1 MRI apparatus 失效
公开(公告)号：EP1115007A1
公开(公告)日：2001-07-11
申请号：EP01104753.7
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563
摘要： The present invention relates to an MRI apparatus capable of preventing the quality of an image from being degraded under the influence of eddy currents and residual magnetization caused by a phase encode gradient. While an RF pulse P1 is sent, a phase encode gradient gy(i) is applied to a warp axis and a read gradient rr is applied to a read axis, an NMR signal is received, followed by application of a rewind gradient gyr(i)' to the warp axis. The rewind gradient gyr(i)' is defined as "(a basic component of opposite polarity equal in time integral value to the phase encode gradient gy(i)) + (a warp-axis correction component for correcting the influence of eddy currents or residual magnetization caused by the phase encode gradient gy(i))".

10. 发明公开

EP1115006A2 MRI apparatus 失效
标题翻译： MRI机
公开(公告)号：EP1115006A2
公开(公告)日：2001-07-11
申请号：EP01104749.5
申请日：1996-03-20
申请人： GE YOKOGAWA MEDICAL SYSTEMS, LTD.
发明人： Goto, Takao
IPC分类号： G01R33/565
CPC分类号： G01R33/56527 , G01R33/56518 , G01R33/56563
摘要： The present invention relates to an MRI apparatus capable of preventing the quality of an image from being degraded under the influence of eddy currents and residual magnetization caused by a phase encode gradient. While an RF pulse P1 is sent, a phase encode gradient gy(i) is applied to a warp axis and a read gradient rr is applied to a read axis, an NMR signal is received, followed by application of a rewind gradient gyr(i)' to the warp axis. The rewind gradient gyr(i)' is defined as "(a basic component of opposite polarity equal in time integral value to the phase encode gradient gy(i)) + (a warp-axis correction component for correcting the influence of eddy currents or residual magnetization caused by the phase encode gradient gy(i))".

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