Targeted Traveling Wave MRI

Marco Mueller¹, Stefan Alt, Reiner Umathum, Wolfhard Semmler, Michael Bock

The travelling wave concepts can be used for whole body MRI at high fields but suffers from high energy deposition (SAR). We introduce a coaxial targeted travelling wave RF coil, which guides the wave to any desired region in the body. To limit whole body SAR, the wave-propagation range is confined to the imaging region. Imaging results with a coil prototype show that the B1 field is focused to the targeted imaging region, and a homogeneous B1 field distribution is achieved outside the magnets symmetry axis.