Abstract #0382
Variations in peak local SAR due to coupling comparison between various pTx array simulation methods
Shubham Gupta 1 , R Allen Waggoner 1 , Keiji Tanaka 1 , and Kang Cheng 1,2
1
Lab. for Cognitive Brain Mapping, RIKEN
Brain Science Institute, Wako, Saitama, Japan,
2
RRC,
RIKEN Brain Science Institute, Wako, Saitama, Japan
This study compared three methods of Parallel
Transmission array simulation, namely, A) Ideally
decoupled method, B) Coupled method and C) Field
superposition method using S-parameters and calculated
peak 10gm average SAR (pk-10gmAvgSAR) for 5000 random
amplitude and phase combinations in two adult human
models for a 4-channel pTx array coil. The results
suggest that compared to Coupled method, both Ideally
decoupled and Field superposition methods
underestimate the pk-10gmAvgSAR for about 80% of times,
hence it is crucial to include coupling in pTx array
simulations. Since field superposition method can both
under- and over-estimate the pk-10gmAvgSAR, it is better
to perform simulations again with optimum capacitor
values being incorporated into the simulation model.
This abstract and the presentation materials are available to members only;
a login is required.
Join Here
