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1. 发明专利

JP2007068996A Method and apparatus for diffusion magnetic resonance imaging 有权
标题翻译：用于扩散磁共振成像的方法和装置
公开(公告)号：JP2007068996A
公开(公告)日：2007-03-22
申请号：JP2006233222
申请日：2006-08-30
申请人： Toshiba America Mri Inc , トーシバアメリカエムアールアイインコーポレイテッドToshiba America Mri, Inc.
发明人： ZHANG WEIGUO , DAVID M KRAMER
IPC分类号： A61B5/055 , G01R33/48
CPC分类号： G01R33/56341
摘要： PROBLEM TO BE SOLVED: To easily and quickly measure the effects of eddy currents.
SOLUTION: The system is equipped with a magnet 10 applying a static magnetic field, an electromagnetic gradient coils 14, an RF coil 15, a pulse sequence controller 19, and a programmable processor 24. The programmable processor determines eddy current parameters which characterizes the effect of the eddy currents induced by diffusion weighting gradient pulses from prescan projection data, adjusts a second sequence having diffusion weighting segments and image acquisition segments, acquires diffusion weighting image data by performing the adjusted second sequence, and generates an image by processing the acquired diffusion weighting image data.
COPYRIGHT: (C)2007,JPO&INPIT
摘要翻译：要解决的问题：轻松快速地测量涡流的影响。解决方案：系统配备有施加静磁场的磁体10，电磁梯度线圈14，RF线圈15，脉冲序列控制器19和可编程处理器24.可编程处理器确定涡流参数，其中表征来自预扫描投影数据的扩散加权梯度脉冲引起的涡流的影响，调整具有扩散加权段和图像采集段的第二序列，通过执行调整后的第二序列获取扩散加权图像数据，并通过处理获得扩散加权图像数据。版权所有（C）2007，JPO＆INPIT

2. 发明专利

JP2000070239A MAGNETIC RESONANCE IMAGING AND MAGNETIC RESONANCE IMAGING APPARATUS 失效
公开(公告)号：JP2000070239A
公开(公告)日：2000-03-07
申请号：JP24187899
申请日：1999-08-27
申请人： TOSHIBA AMERICA MRI INC
发明人： ZHANG WEIGUO , DAVID M KRAMER , ANDREW LEIGH
IPC分类号： A61B5/055 , G01R33/48 , G01R33/54 , G01R33/565
摘要： PROBLEM TO BE SOLVED: To make it possible to easily separate water and fat in spite of the presence of the nonuniformity of a magnetostatic field by rewinding a phase value information according to a region expansion phase rewinding method by a multinominal model and determining respective pieces of pixel data in which the water and fat are dominant by using the phase value information rewound according to the specific equation. SOLUTION: The water and fat co-existence MR signal S subjected to Fourie transform can be expressed by equation I in an image frequency region. In the equation, W, F are respectively the water and fat signals, Φ is the signal phase by the influence from the nonuniformity of the magnetostatic field and other systems. The signal phase Φ is quantified by obtaining the argument of the square of the MR signal S of the complex image region in an S (step) 32 and can be mathematically expressed by equation II. In the equation, arg S2} is the operation to repeat the phase of the input signal. Discrimination as to whether the phase rewinding is necessary or not is executed in S33 and the region expansion algorithm by a multinominal model is used for the phase rewinding in S34. When the rewinding phase Φ is once obtd. in S35, the pixel (Iwater-pixel) of the water the (Ifat-pixel) of the fat are calculated in S36 in accordance with equations III, IV.

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