Q matrix approach to control implant heating by transmit array coils
Frank Seifert 1 , Gerd Weidemann 1 , and Bernd Ittermann 1
Physikalisch-Technische Bundesanstalt (PTB),
Braunschweig und Berlin, Germany
The hazard of excessive local tissue heating due to
metallic implants can be mitigated when utilizing the
additional degrees of freedom of a transmit coil array.
In this proof of principle study we used the single
Q-matrix associated with the proximate tissue volume of
a metallic implant to determine the 'worst case'
steering conditions for implant heating. From a simple
projection of the voltage vector to be applied to a sub
space which is orthogonal to this 'worst case' voltage
vector new steering conditions are determined which
result in much lower implant heating. To demonstrate the
efficacy of this method we performed thermal simulations
using a 7T 8-channel head coil model. This approach can
simply be embedded into B1-shimming procedures.
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