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Nonlinear amplitude compression in magnetic resonance imaging: quantization noise reduction and data memory saving

机译:磁共振成像中的非线性幅度压缩:量化噪声降低和数据存储节省

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摘要

Dynamic range improvement in magnetic resonance imaging (MRI) by nonlinear amplitude compression is proposed. Quantization noise reduction by a factor of 10 to 20 is confirmed by a numerical simulation, provided an appropriate nonlinear transform is chosen. The piecewise-linear transform is the best nonlinear transform studied so far. Implementing amplitude compression requires no additional hardware in a usual MRI system if the low spatial frequency lines of the magnetic resonance (MR) signal are selectively prescanned through an attenuator. The method will be particularly effective in 3-D imaging of large objects. MR angiography, and imaging of solids.
机译:提出了通过非线性幅度压缩改善磁共振成像(MRI)的动态范围。如果选择了适当的非线性变换,则通过数值模拟可以确认量化噪声降低了10到20倍。分段线性变换是迄今为止研究的最好的非线性变换。如果通过衰减器选择性地预扫描磁共振(MR)信号的低空间频率线,则在通常的MRI系统中实现振幅压缩不需要额外的硬件。该方法在大型物体的3D成像中特别有效。 MR血管造影和固体成像。

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