Title :
Nonlinear amplitude compression in magnetic resonance imaging: quantization noise reduction and data memory saving
Author :
Kose, Katsumi ; Endoh, Kazuhiro ; Inouye, Tamon
Author_Institution :
Inst. of Appl. Phys., Tsukuba Univ., Ibaraki, Japan
fDate :
6/1/1990 12:00:00 AM
Abstract :
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.<>
Keywords :
biomedical NMR; computerised picture processing; computerised spectroscopy; diagnostic radiography; digital simulation; medical diagnostic computing; nuclear magnetic resonance spectroscopy; piecewise-linear techniques; transforms; 3-D imaging; MR angiography; data memory saving; imaging of solids; magnetic resonance imaging; nonlinear amplitude compression; nonlinear transform; numerical simulation; piecewise-linear transform; quantization noise reduction; Attenuators; Dynamic range; Frequency; Hardware; Magnetic resonance; Magnetic resonance imaging; Noise reduction; Numerical simulation; Piecewise linear techniques; Quantization;
Journal_Title :
Aerospace and Electronic Systems Magazine, IEEE
