Daniel Wenz1,2
1CIBM Center for Biomedical Imaging, Lausanne, Switzerland, 2Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
1CIBM Center for Biomedical Imaging, Lausanne, Switzerland, 2Animal Imaging and Technology, Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne, Switzerland
Loop-dipole coupling scheme, which can excite orthogonal
dielectric modes in a rectangular dielectric resonator antenna arrays, provides
significant transmit performance gains when compared to a dipole-only coupling
scheme.
Fig. 4. Transmit performance of the 8-channel
dipole-fed rectangular dielectric resonator (RDR) array compared with the
16-channel loop-dipole coupled RDR array (circularly polarized mode). The 16-channel array yielded significantly higher B1+
(+35%) and SAR (+9%) efficiency in the center of the spherical phantom.
Fig. 2. Phantom measurements: MR images obtained for a single-element
loop- and loop-dipole-coupled rectangular dielectric resonator antenna. Three
different profiles were selected and signal intensity as a function of distance
was shown below.