Matteo Pavan1,
Klaas Paul Pruessmann1
1ETH Zurich, Zurich, Switzerland
In
MR measurement, coils are detecting proton signal; they are usually connected
through a matching network to very low noise amplifier. The Noise Figure of
the amplifier depends on the impedance that its input port sees. To optimize
SNR, is important to match this impedance to the one that is reducing at the
minimum the noise figure. A new approach for automatic impedance measurement
is here presented. This new approach is easy and modular in such a way that
it can be scaled to any number of reception channels.