The NMR multi-transmit phased array: a Cartesian feedback approach
The NMR multi-transmit phased array: a Cartesian feedback approach
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DOI：
10.1016/j.jmr.2004.07.020
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发表时间：
2004-11-01
影响因子：
2.2
通讯作者：
King, SB
中科院分区：
文献类型：
--
作者：
Hoult, DI;Kolansky, G;King, SB
The use of Cartesian feedback is proposed to solve the problem of using an array of coils for the purposes of transmission in magnetic resonance imaging. The difficulties caused by direct and sample-mediated coil interactions are briefly examined, and the known solutions of using power-mismatched pre-amplifiers and transmitters noted. It is then shown that, without loss of transmitter efficiency, a high effective impedance may be created in series with each coil in the array by the use of Cartesian negative feedback. A bench experiment is described that confirms the theory. The solution is also viable for signal reception and is more efficacious than pre-amplifier damping, albeit over a smaller bandwidth. Crown Copyright (C) 2004 Published by Elsevier Inc. All rights reserved.
