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
A novel
metamaterial liner based RF transmit coil, representing a new class of volume
coil, is developed for 23Na/1H head imaging at 4.7T. Reduced specific
absorption rate for the same transmit field compared to the birdcage coil is
demonstrated by simulation and imaging results are presented.
Figure 3: (Left) Simulation model of the birdcage coil (with tuning
capacitors labelled) used to compare performance of the (Middle) simulation
model of the metamaterial resonator with human body model. (Right) Photograph
of the constructed metamaterial liner resonator. Small wires (0.6 mm diameter)
join the Cr capacitor pads to the aluminum mesh through contact
between conductive rails that press against aluminum tape on the inner side of
the polycarbonate shell.
Figure 4: (Left) Simulated transmit performance of the metamaterial
liner and single tuned birdcage coil for 1H – 200 MHz and 23Na – 52.9 MHz imaging. (right) Maximum intensity
projections of the local 10g average SAR normalized to a mean 1μT
transmit field in the region outlined in the transmit efficiency maps
for 1H–(200 MHz) and 23Na–(52.9 MHz).
