Figure 2.

S-parameters of the simulated birdcage coil (driven at two ports) for each of the voxel models simulated. The coil was tuned and matched at 297 MHz (indicated by red line) using the adult voxel model, and generally good matching can be seen for this model (S_nn≤ 20 dB). We observe some shifting of the resonance frequency when loaded with neonate models, but still obtain acceptable return loss. Neonates were simulated both with adult ({ε;σ}_adult) and neonate-appropriate ({ε;σ}_neonate) dielectric properties. Neonate B was also simulated with a simplified tissue segmentation ({ε;σ}_adult,simple) (details in text)