Dynamic Range Expansion of Receiver by Using Optimized Gain Adjustment for High-Field MRI

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In high-field magnetic resonance imaging (MRI) system, the signal-to-noise ratio of MR signal is so high that the receiver frequently cannot cover the full dynamic range of the MR signal. Although this problem can be overcome by using a compander (compressor and expander) composed of logarithmic amplifiers and a ROM table to retrieve the non-linearity of the logarithmic amplifiers or by simply increasing the number of bits of analog-to-digital converter, the methods can be costly and complex or even impossible for most commercial systems. in addition, the spectrometer has to be specifically designed to operate in those modes. In this article, we developed a simple dynamic range improvement method using a receiver with optimized variable gain control in which function can be implemented without any hardware modification to the spectrometer, if the spectrometer can do gain control during a scan. Simulations as well as experiments for the brain and resolution phantom have been performed, and the results demonstrate the utility of the proposed method. (C) 2010 Wiley Periodicals, Inc. Concepts Magn Reson Part A 36A: 243-254, 2010.
Publisher
JOHN WILEY SONS INC
Issue Date
2010-07
Language
English
Article Type
Article
Keywords

RESOLUTION; NMR

Citation

CONCEPTS IN MAGNETIC RESONANCE PART A, v.36A, no.4, pp.243 - 254

ISSN
1546-6086
DOI
10.1002/cmr.a.20164
URI
http://hdl.handle.net/10203/99470
Appears in Collection
EE-Journal Papers(저널논문)
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