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Communication Design of a capacitively decoupled transmit/receive NMR

Summary: Communication
Design of a capacitively decoupled transmit/receive NMR
phased array for high field microscopy at 14.1 T
Xiaozhong Zhang and Andrew Webb*
Department of Electrical and Computer Engineering, Beckman Institute for Advanced Science and Technology,
University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
Physikalisches Institut, University of Wurzburg, Germany
Received 17 February 2004; revised 29 April 2004
Available online 10 July 2004
A design is presented for a ``phased array'' of four transmit/receive saddle-geometry volume coils for microimaging at 600 MHz
within a 45 mm clear-bore vertical magnet. The small size of the coils, $10 mm in length, and high frequency of operation both
present considerable challenges for the design of a phased array. The particular design consists of four saddle coils, stacked ver-
tically, in order to produce an array suitable for imaging samples, typical of many microimaging studies, with a large length:di-
ameter ratio. Optimal coil overlap is used to reduce the mutual inductance between adjacent coils, and capacitive networks are used
to maximize the isolation between all of the coils. Standard 50 X input impedance preamplifiers are used so that the preamplifiers do
not have to be integrated directly into the probe. Isolation between coils was better than 20 dB for all coil pairs. An increase in
signal-to-noise of 70 3% was achieved, averaged over the whole array, compared to a single coil of the same dimensions. High
resolution phased array images are shown for ex vivo tissue samples.
2004 Published by Elsevier Inc.


Source: Andrews, Anne M. - Huck Institutes of the Life Sciences, Pennsylvania State University


Collections: Biology and Medicine