Graham Wiggins1, Qi Duan1, Riccardo Lattanzi1, Daniel K. Sodickson1
1Radiology, Center for Biomedical Imaging, NYU School of Medicine, New York, NY, USA
In high field MR the B1+ transmit and B1- receive patterns of a surface coil no longer coincide, but twist in opposite directions. When such a coil is used in a transmit-receive mode this leads to a loss of efficiency. Through full wave electromagnetic simulation and experiment we investigate the benefits of using separate transmit and receive elements and offsetting them so that the B1+ and B1- fields curl towards each other. SNR benefits of up to 40% are obtained, and it is found that there is an optimal angular offset for a given depth in the sample.