Adam Maunder1, Ashwin Iyer2, and Nicola De Zanche1
1Oncology, Medical Physics, Cross Cancer Institute, University of Alberta, Edmonton, AB, Canada, 2Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
1Oncology, Medical Physics, Cross Cancer Institute, University of Alberta, Edmonton, AB, Canada, 2Electrical and Computer Engineering, University of Alberta, Edmonton, AB, Canada
At high-field strengths SAR safety regulations greatly limit sequence
optimization with whole-body imaging. In simulation, the metamaterial liner presented here was found to produce 41% of the maximum 10g averaged SAR for the same transmit field relative to a comparable birdcage coil.
Figure 5: Maximum intensity projections of
SAR in axial, coronal and sagittal views normalized for 1
μT
excitation within the volume outlined in the transmit efficiency maps (Figure
4). The location of the maximum SAR for both is indicated at the right arm,
which is the body part nearest to the current-carrying conductors.
Figure 2: Side-views
of HFSS simulation models for (left) birdcage coil used as a standard for
comparisons of MR transmission metrics and (right) metamaterial liner with
human body model shown inside. Locations of transmission ports and dimensions
are labelled.
