Dinesh K. Deelchand1, Gregor Adriany1,
Can Akgun1, Kamil Ugurbil1, Pierre-Gilles Henry1,
Pierre-Francois Van de Moortele1
1Center for Magnetic Resonance
Research,
Single-loop
and quadrature surface RF coils are often used for NMR spectroscopy since
higher signal-to-noise ratio can be achieved in comparison to single channel
volume coils. This study shows that single-loop coils are inefficient for
human brain spectroscopy studies at 9.4 Tesla because the areas of high
values in transmit and receive B1 fields do not overlap in space.
On the other hand, quadrature surface coils can still be used as long as the
phase between the two coil elements is optimized for a given
region-of-interest in order to increase the B1 transmit
efficiency.