Effective Delivery of the Traveling Wave to Distant Locations in the Body at 7T

Anna Andreychenko¹, Dennis W.J. Klomp¹, Bob van den Bergen¹, Bart L. van de Bank¹, Hugo Kroeze¹, Jan J.W. Lagendijk¹, Peter Luijten¹, Cornelis A.T. van den Berg¹

A strong attenuation of the traveling wave occurs during the passage through the body. In this study we propose a new concept to deliver a maximum B1+ to distant locations in the body using the waveguide with a coaxial conductive inset. A 2 to 6 times higher SNR ratios in 7T MR images of the male pelvis comparing to the standard traveling wave excitation were achieved with this concept. On top of that, the use of the coaxial conductive inset results in significantly lower SAR levels in the body.