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41. 发明授权

US06459922B1 Post data-acquisition method for generating water/fat separated MR images having adjustable relaxation contrast 有权
标题翻译：用于产生具有可调节的松弛对比度的水/脂肪分离的MR图像的数据采集方法
公开(公告)号：US06459922B1
公开(公告)日：2002-10-01
申请号：US09281429
申请日：1999-03-30
申请人： Weiguo Zhang
发明人： Weiguo Zhang
IPC分类号： A61B505
CPC分类号： G01R33/4828 , G01R33/5608
摘要： A post data-acquisition magnetic resonance imaging (MRI) method is disclosed for generating water/fat separated MR images wherein the resultant contrast in water-only or fat-only images is made adjustable under operator control. Image data is first obtained using a single-scan three-point Dixon MRI scan sequence having a specific nuclear magnetic response (NMR) signal echo time, TE. The timing of read-out gradient pulses during the MRI imaging scan sequence is selected according to the chemical-shift difference between water and fat signals so that the water and fat NMR signals evolve between them an angle of &pgr; radians during an inter-echo time &Dgr;TE. Water/fat separated images of variable contrast are then produced by reprocessing the acquired image data using different operator selected values for the contrast echo time (newTE) when correcting for relaxation.
摘要翻译：公开了用于产生水分/脂肪分离的MR图像的后数据采集磁共振成像（MRI）方法，其中在仅在水中或仅脂肪图像中产生的对比度在操作者控制下可调节。首先使用具有特定核磁响应（NMR）信号回波时间TE的单扫描三点Dixon MRI扫描序列获得图像数据。根据水和脂肪信号之间的化学位移差选择MRI成像扫描序列期间的读出梯度脉冲的定时，使得水和脂肪核磁共振信号在它们之间在回波间时间内呈现π弧度角 DELTATE。然后通过在校正放松时对对比回波时间（newTE）使用不同的操作者选择的值重新处理获取的图像数据来产生可变对比度的水/脂肪分离的图像。

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