Ultra High Dielectric Constant (uHDC) Head Insert at 3T for Dramatic Reduction of SAR and B 1 + inhomogeneity
Christopher Sica 1 , Wei Luo 2 , Sebastian Rupprecht 1 , Michael Lanagan 2 , Christopher Collins 3 , Raffi Sahul 4 , Seongtae Kwon 4 , and Qing Yang 1
Radiology, Penn State College of Medicine,
Hershey, Pennsylvania, United States,
Science and Mechanics, Penn State University,
Pennsylvania, United States,
New York University, New York, New York, United States,
Technologies, State College, Pennsylvania, United States
A novel configuration incorporating high dielectric
material (εr ~1200) was evaluated experimentally at 3T
in the human brain and numerically with FDTD simulation
for SAR reduction, B1+ enhancement and SNR improvement.
The 10g average whole body SAR and whole brain SAR was
reduced by 80.3% and 59.8%. System transmit power in
experiment is reduced by 70%. The measured B1+
coefficient of variation was reduced on average by 30%
across 16 slices in the brain. SNR gains of 40-50% in
the periphery of the brain were observed.
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