Abstract #1338
Automatic matching of transmit arrays with optically controlled capacitors
Giorgos Katsikatsos 1 and Klaas Paul Pruessmann 1
1
Institute for Biomedical Engineering, ETH
Zurich, Zurich, Zurich, Switzerland
A closed-loop controlled matching for Tx-arrays for a 7T
scanner has been implemented as an autonomous system to
react to load changes in various stages of an MR
experiment. Building blocks of the system are the
L-matching networks, built from custom low-loss
capacitors actuated by piezoelectric motors, controlled
by an external computer. The feedback is provided by a
network analyzer which triggers the re-matching
procedure. The matching algorithm is based on previous
knowledge about the matching circuit connected to the
array and uses common objective functions to detect the
best matching settings for arbitrary loads.
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