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1.发明授权Method for reducing Maxwell term artifacts in fast spin echo MR images 失效用于在快速自旋回波MR图像中降低Maxwell术语伪影的方法
公开(公告)号：US6011392A
公开(公告)日：2000-01-04
申请号：US5768
申请日：1998-01-12
IPC分类号： G01R33/561 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56581 , G01R33/56554 , G01R33/5617
摘要： Fast spin echo pulse sequences are adjusted to reduce, or eliminate image artifacts caused by Maxwell terms arising from the linear imaging gradients. The waveforms of the slice selection, phase encoding and readout gradients are adjusted in shape, size or position to eliminate or reduce the phase error caused by the spatially quadratic Maxwell terms.
摘要翻译： 调整快速自旋回波脉冲序列以减少或消除由线性成像梯度引起的麦克斯韦术引起的图像伪像。 切片选择，相位编码和读出梯度的波形在形状，大小或位置上进行调整，以消除或减少由空间二次Maxwell项引起的相位误差。
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公开(公告)号：US6008647A
公开(公告)日：1999-12-28
申请号：US831684
申请日：1997-04-10
IPC分类号： G01R33/48 , A61B5/055 , G01R33/561 , G01R33/565 , G01V3/00
CPC分类号： G01R33/56581 , G01R33/56554
摘要： Fast spin echo pulse sequences are adjusted to reduce, or eliminate image artifacts caused by Maxwell terms arising from the linear imaging gradients. The waveforms of the slice selection, phase encoding and readout gradients are adjusted in shape, size or position to eliminate or reduce the phase error caused by the spatially quadratic Maxwell terms.
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公开(公告)号：US6134464A
公开(公告)日：2000-10-17
申请号：US12509
申请日：1998-01-23
CPC分类号： G01R33/4833 , G01R33/4835
摘要： A fast spin echo (FSE) pulse sequence is employed to perform a multi-slice, multi-angle MRI scan. The slices are scanned in groups, with all the slices in each group being oriented at the same angle and sampled in an interleaved manner. Total scan time is reduced by acquiring multiple, separately phase encoded echo signals during each FSE pulse sequence. Presaturation bands may be produced for each group of slices to reduce flow artifacts in the reconstructed slice images.
摘要翻译： 采用快速自旋回波（FSE）脉冲序列进行多层多角度MRI扫描。 切片按组扫描，每组中的所有切片以相同的角度取向并以交错方式进行采样。 通过在每个FSE脉冲序列期间获取多个单独相位编码的回波信号来减少总扫描时间。 可以为每组切片产生预饱和带，以减少重建切片图像中的流动伪影。
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