Title :
Parametric Amplification of Magnetic Resonance Images
Author :
Syms, Richard R A ; Floume, Timmy ; Young, Ian R. ; Solymar, Laszlo ; Rea, Marc
Author_Institution :
EEE Dept., Imperial Coll. London, London, UK
fDate :
6/1/2012 12:00:00 AM
Abstract :
Parametric amplification is considered as a method for the detection of magnetic resonance imaging (MRI) signals. The theory of three-frequency amplifiers is reviewed, and aspects relevant to radio-frequency detection are highlighted. The modifications needed for MRI are described, and a parametrically amplified surface coil for 63.85 MHz operation is demonstrated. Electrical characterization is carried out, and good agreement is obtained with the theory. A linear gain of 100 (40 dB power gain) and a Q-factor of 18 000 are demonstrated. 1H MRI is carried out at 1.5 T and frequency-domain filtering of images is demonstrated.
Keywords :
amplifiers; frequency-domain analysis; magnetic resonance imaging; MRI signal; Q-f&ctoτ; electrical characterization; frequency 63.85 MHz; frequency-domain filtering; magnetic resonance images; parametric amplification surface coil; radio-frequency detection; three-frequency amplifiers; Bandwidth; Coils; Gain; Magnetic resonance imaging; Noise; Q factor; Resonant frequency; Magnetic resonance imaging; parametric amplification;
Journal_Title :
Sensors Journal, IEEE
DOI :
10.1109/JSEN.2011.2176928
