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

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3 Author(s)
K. Kose ; Inst. of Appl. Phys., Tsukuba Univ., Ibaraki, Japan ; K. Endoh ; T. Inouye

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.<>

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IEEE Aerospace and Electronic Systems Magazine  (Volume:5 ,  Issue: 6 )