Abstract #1339
A Fully Integrated Automatic Tune and Match System for an 8-Channel Transmit/Receive Cardiac TEM Array at 7T: Initial Results in a Phantom and Volunteers
Graeme A Keith 1 , Christopher T Rodgers 1 , Aaron T Hess 1 , Carl J Snyder 2 , J Thomas Vaughan 2 , and Matthew D Robson 1
1
Oxford Centre for Clinical Magnetic
Resonance Research, University Of Oxford, Oxford,
Oxfordshire, United Kingdom,
2
Center
for Magnetic Resonance Research, University of
Minnesota, Minneapolis, Minnesota, United States
Results in both a saline phantom and in humans are
presented for an auto-tune system using piezoelectric
actuators and MATLAB control. The system was implemented
on an 8-channel pTx cardiac TEM array for use at 7T. A
rigorous performance evaluation algorithm was run on the
phantom and found that in the majority of cases the S
11
was
significantly improved by the system. The system was
then employed on human subjects, and it was found that
it could successfully tune on a person in a maximum of 6
minutes. The system is now in routine use in our lab.
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